Q.
What is the ratio of the velocity of sound at 4 atmosphere to that at 1 atmosphere?
1 : 2
2 : 1
1 : 1
4 : 1
Explanation:
Q.
Holes can exist in____________________?
All of the above
Semi conductors
Insulators
Conductors
Explanation:
Q.
The mass of Platinum cylinder kept near Paris is________?
1 Kg
1 gram
100 Kg
None
Explanation:
Q.
When fluid is incompressible then________________?
The velocity of the fluid is constant
The volume of the fluid is constant
The density of the fluid is constant
The flow of the fluid is the straight line
Explanation:
Q.
The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body ___________________?
10 cm
7.5 cm
15 cm
5 cm
Explanation:
Q.
How many types of units are in SI ?
1
4
2
3
Explanation:
Q.
If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?
Brightness increases
No light
Remains same
Brightness decreases
Explanation:
Q.
The circumference subtends an angle________________?
? radian
?/2 radian
4? radian
2? radian
Explanation:
Q.
In which quadrant, the only value of tan will be positive ?
First
Third
Both 1st and 3rd
Second
Explanation:
Q.
Which of the following group of forces can produce equilibrium?
12N, 5N, 15N
12N, 5N, 20N
10N, 18N
4N ,2N, 10N
Explanation:
Q.
The waveform of S.H.M. is________________?
Square wave
None
Sine wave
Standing wave
Explanation:
Q.
Which of the following statements is true when we see
The sky remains clear and the sun is at lower position in the sky
We face sun and raindrops
The Sun remains behind us and we face raindrops
In light rainfall, we face Sun
Explanation:
Q.
Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________?
Non-concurrent
Concurrent
Parallel
Non-parallel
Explanation:
Q.
The purpose of flywheel in the engines is________________?
both A and B
to add more weight to engine to work it stable
to start engine
to smooth out the energy variation
Explanation:
Q.
Which equation is not dimensionally correct ?
Vf=Vi+at
S=Vt2
S=1/2at2
E=mc2
Explanation:
Q.
Tick the correct statement_________________?
Moderators slow down the neutrons
Moderators bring the neutrons to rest
Moderators absorb the neutrons
Moderators reflect the neutrons
Explanation:
Q.
Dimensional analysis is helpful for__________________?
Deriving a possible formula
Only A and B are correct
Verification of laws
Checking the homogeneity of a physical equation
Explanation:
Q.
The most useful tracer is_________________?
CA-41
I-131
Sr-90
C-14
Explanation:
Q.
The displacement of SHM is written as X = X`sin?t if the displacement is written by X = X? sont then phase constant will be equal to_______________?
180
90
45
0
Explanation:
Q.
If the momentum of an object is increased twice, then what will be the kinetic energy?
Four times
Sixteen times
Thrice
Twice
Explanation:
Q.
Oil rises up to wick in a lamp because_____________?
Capillary action phenomenon
Oil is volatile
Oil is very light
Diffusion of oil through the wick
Explanation:
Q.
If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of______________?
Boyles law
Ideal gas law
Charles law
Avagadros law
Explanation:
Q.
A photon is always considered to be: ________?
At rest
In accelerated form
Moving with speed of sound
Moving with speed of light
Explanation:
Q.
When a body moves in a circle of radius r with linear speed V its centripetal force is_______________?
mV2/r
mV/r2
mV/r
mV2/r2
Explanation:
Q.
Two vectors A and B are making angle ? with each other. The scalar projection of vector B on vector A is written as____________?
A.B/B
Both a and b are correct
A.B/A
A.cos?
Explanation:
Q.
Magnifying power of simple microscope______________?
list distance of distinct vision
increase with increase in focal length
increase with decrease in focal length
no effect with decrease or increase with focal length
Explanation:
Q.
Alpha particles possess greater penetration power than that of beta particles due to its_____________?
Greater ionization power
Smaller ionization power
Same ionization power
Neither greater nor smaller ionization power
Explanation:
Q.
The unit of entropy is________________?
J/K
J.K
Kgm2/sec2.K
N.m/sec
Explanation:
Q.
Area under the curve of velocity-time graph gives_______?
Acceleration
Displacement
Momentum
Force
Explanation:
Q.
An alternating current is represented by the equation I = I?sin?t which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?
I = 2ISin?t
I = 2I?Sin(?t/2)
I = I?sin(2?t)
I = 2I?Sin(2?t)
Explanation:
Q.
Davison Germer experiment indicates__________________?
Polarization
Interference
Electron diffraction
Refraction
Explanation:
Q.
Ohm is a unit of measuring _________?
Resistance
Voltage
Current
None of these
Explanation:
Q.
A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2
22N
4N
16N
20N
Explanation:
Q.
Absolute uncertainty in a measurement depends upon______________?
All of a, b and C
Percentage error in the measurement
The magnitude of the measurement
Least count of the instrument
Explanation:
Q.
Very weak magnetic fields are detected by___________________?
Magnetometer
Oscilloscope
Squids
Magnetic resonance imaging (MRI)
Explanation:
Q.
The performance of a refrigerator is described by________________?
efficiency
coefficient of performance
not described
both A and B
Explanation:
Q.
A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be______________?
19.6 N
39.2 N
129.4 N
9.8 N
Explanation:
Q.
A simple pendulum suspended from the ceiling of a lift has time period T when the lift is at rest. When the lift falls freely, the time period is_________________?
T/g
Infinite
g/T
Zero
Explanation:
Q.
The operation of a transistor requires______________?
That the emitter be heated
That the base be heated
None of the above
That the collector be heated
Explanation:
Q.
Dimension of pressure is__________________?
MLT
ML-2T-2
ML-1T-1
ML-1T-2
Explanation:
Q.
An alpha particle can produce fluorescence in__________________?
Barium platinocyanide
Calcium tungstate
ZnS
All of above
Explanation:
Q.
Maximum number of rectangular components are_____________?
3
2
1
4
Explanation:
Q.
In an electron microscope, we use energetic particles because of______________?
All the above reasons
Penetrating power is high
Wavelength is very short
Kinetic energy is large
Explanation:
Q.
Electrons present in p-type material due to thermal pair generation are_____________?
blockers
majority carriers
minority carriers
dual carriers
Explanation:
Q.
What is the acceleration of free fall on the moon of that on the Earth ?
1/4th
None of these
1/8th
1/6th
Explanation:
Q.
After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?
Increases because wavelength decreases
Increases then decrease
Remains same
Decreases because speed decreases
Explanation:
Q.
The projection of the particle moving in a circle with non-uniform speed executes ?
S.H.M
Both B and D
None S.H.M
Vibratory motion
Explanation:
Q.
Prefix deca represents_______________?
10 Raised to power 1
10 Raised to power -1
10 Raised to power 2
10 Raised to power 3
Explanation:
Q.
ML-1 T-2 is the dimension of_______________?
Momentum
Force
Energy
Pressure
Explanation:
Q.
The direction of propagation of an electromagnetic waves is________________?
Parallel to electric and magnetic field
Perpendicular to both electric and magnetic field
Perpendicular to electric field
Perpendicular to magnetic field
Explanation:
Q.
The synopsis of Einstein
The faster you move, the heavier you get
The faster you move, the lighter you get
The slower you move, the heavier you get
None of the above
Explanation:
Q.
In which process all the heat supplied is converted into work done ?
isobaric
isochoric
isentropic
isothermal
Explanation:
Q.
The penetrating power of X-rays depends on their______________?
frequency
source
all of the above
applied voltage
Explanation:
Q.
The velocity of a particle of mass m of de-Broglie wavelength ? is______________?
v = 2
v = 2
v = 2
v = 3
Explanation:
Q.
The power is the dot product of ___________ quantities.
Force and time
Force and speed
None of these
Force and velocity
Explanation:
Q.
CFC is used in _________________?
All of above
Refrigeration
Plastic foam industry
Aerosol spray
Explanation:
Q.
Galvanometer is a very sensitive device with______________________?
very high damping
very low damping
no damping at all
radial field disintegration
Explanation:
Q.
A lens which converges a beam of parallel rays to a point is called______________?
plano convex lens
converging (or convex) lens
plano concave lens
diverging (or concave) lens
Explanation:
Q.
The antiparticle of electron is: ______?
Positron
Neutron
Meson
Proton
Explanation:
Q.
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
1T = 104 G
1T = 10-2 G
1T = 103 G
1T = 10-4 G
Explanation:
Q.
Modern system of navigation satellites called ___________?
Navstar
Inertia frames of reference
Proton
None of these
Explanation:
Q.
Dioptre power of an concave lens of 10 cm focal length is_______________?
1 / 10 dioptre
10 dioptre
10 dioptre
1 / 10 dioptre
Explanation:
Q.
The sensitivity of a galvanometer is given by__________________?
BAN/C
CAN/B
ABC/N
C/BAN
Explanation:
Q.
Which of the following properties of molecules of a gas is same for all gases at particular temperature ?
velocity
mass
kinetic energy
momentum
Explanation:
Q.
Antimatter consists of ______________?
Antiproton
Antineutron
All of above
Positron
Explanation:
Q.
How many main frontiers of fundamental science ?
3
4
2
1
Explanation:
Q.
Bracket series is obtained when all transition of electron terminate on_______________?
4th orbit
5th orbit
2nd orbit
3rd orbit
Explanation:
Q.
The density of human blood is nearly equal to____________?
Honey
Oil (kerosene)
Water
Mercury
Explanation:
Q.
A changing magnetic flux produces around itself an induced_______________?
Electromagnetic force
Magnetic field
Electric field
Artificial gravitational field
Explanation:
Q.
The length of the second pendulum is_________________?
99 cm
99.2 cm
98 cm
100 cm
Explanation:
Q.
For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?
107m/sec
Should be greater than the speed of light.
Be zero
Not be wave-like
Explanation:
Q.
An inductive coil has a resistance of 100?. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45?. What is the inductance of the coil ?
20mH
16mH
10mH
12mH
Explanation:
Q.
Gravitation force of moon is_________?
3.75 m/s
9.8 m/s
7.2 m/s
1.62 m/s
Explanation:
Q.
hen a body moves in a circle, the angle between its linear velocity and angular velocity is always_______________?
45
0
90
Explanation:
Q.
When a wheel 1 m in diameter makes 30 rev min the linear speed of the point on its rim in ms-1 is_______________?
2?
20?
?/2
?
Explanation:
Q.
An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?
B = eE/V
E = BV
E = BeV
E = BeV/2
Explanation:
Q.
If a material object moves with speed of light its mass becomes ________________?
zero
double of its rest mass
equal to its rest mass
infinite
Explanation:
Q.
Which of the following is true ?
Balmer series is a line spectrum in the ultraviolet.
the spectral series formula can be derived from the Rutherford model of the hydrogen atom.
Paschen series is a line spectrum in the infra red.
Lyman series is a continuous spectrum.
Explanation:
Q.
An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10? resistor. The peak current is then ?
6.66A
20A
20.66A
5.66A
Explanation:
Q.
Identify the correct statement about minority carriers_____________?
free electrons in n-type and holes in p-type
holes in n-type and free electrons in p-type
free electrons in n-type and p-type
holes in n-type and p-type
Explanation:
Q.
The rectangular voltage is an example of____________________?
An analogue waveform
Continuous wave form
A digital waveform
Electronic waveform
Explanation:
Q.
Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is______________?
Same
Sometimes smaller some times greater
Smaller
Greater than 82
Explanation:
Q.
A central force is that which__________________?
Some time can produce torque some time cannot
Has no relation with torque
Can produce torque
Cannot produce torque
Explanation:
Q.
Torque is defined as______________?
Turning effect of force
Cross product of position vector and force
Product of force and moment arm
All A, B and C are correct
Explanation:
Q.
Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
1 m A
0.1 A
1:00 AM
current sensitivity
Explanation:
Q.
Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
Effective values of voltage and current
Instantaneous values of voltage and current
Peak values of voltage and current
All of the above
Explanation:
Q.
If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?
spherical aberration
both spherical and chromatic
distortion
chromatic aberration
Explanation:
Q.
If a photon is reflected from the mirror then the change in momentum of each photon is_______________?
Double
Zero
1
Half
Explanation:
Q.
Speed of a body can not be_______?
Negative
Zero
Positive
None
Explanation:
Q.
Boyles law helds for ideal gases in________________?
isochoric processes
isothermal processes
adiabatic processes
isobaric processes
Explanation:
Q.
The electronic circuits which implement the various logic operations are called_____________?
Boolean algebra
Logic functions
Logic gates
Amplifier gain
Explanation:
Q.
Blood vessels are______________?
Of rubber
Of glass
Rigid
Not rigid
Explanation:
Q.
To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is_____________?
2
3
4
5
Explanation:
Q.
The dimension of force is__________________?
ML-1T
MLT-1
ML-1T-2
MLT-2
Explanation:
Q.
At constant temperature the graph between V and 1/P is_____________?
A straight lime
A curve of any shape
Hyperbola
Parabola
Explanation:
Q.
The semiconductor diode can be used as a rectifier because _______________?
It has high resistance to the current flow when reverse biased
It has low resistance to the current flow when forward biased.
Its conductivity increases with rise of temperature.
It has low resistance to the current flow when forward biased & high resistance when reverse biased.
Explanation:
Q.
Value of
6ge
2ge
ge/6
Zero
Explanation:
Q.
The equation ? = 1.22 ?/D was devised by_______________?
Newton
Einstein
Planks
Raleigh
Explanation:
Q.
Which one of the following is not a radioactive element ?
Uranium
Radium
Thorium
Cadmium
Explanation:
Q.
Semi-conductors with donor atoms and free electrons belong to the type________________?
mix
p
n
any of above
Explanation:
Q.
Which one of following band is completely filled in case of conductors ?
Conduction band
Fermi band
Valence band
Forbidden band
Explanation:
Q.
The value of R ( Universal Gas Constant ) = ___________?
1.314 J/mole K
8.314 J/mole K
6.5
10.314 J/mole K
Explanation:
Q.
Intensity level of threshold of pain is: _____________?
120 db
100 db
80 db
60 db
Explanation:
Q.
When a body is moving along a circular path it covers a certain angle in a given interval of time. Such type of motion is__________________?
Linear motion
Angular motion
Rotatory motion
Vibratory motion
Explanation:
Q.
A chimney works best if air exposed to the chimney is______________?
Moving fast
Moving slowly
Stationary
Moving
Explanation:
Q.
Terminal velocity is given by equation_______________?
Vt = gr2/9?
Vt = gr2?
Vt = 2gr2/9?
Vt = 9gr2/2?
Explanation:
Q.
Neutron and proton are commonly known as______________?
Nucleon
Quartz
Meson
Boson
Explanation:
Q.
Tesla is the unit for measuring:
None of the above
Magnetic induction
Magnetic intensity
Magnetic moment
Explanation:
Q.
Which one of the following of glass can cut ultraviolet rays?
Soda Glass
Pyrex Glass
Crookes Glass
Jena Glass
Explanation:
Q.
Petrol engine is a________________?
C.I engine
IC engine
all the above
SI engine
Explanation:
Q.
The minimum distance between an object and its real image in a convex lens is_____________?
3f
2.5 f
2 f
4f
Explanation:
Q.
Which of the following waves have smallest velocity in vacuum?
Infra-Red
Ultraviolet
Micro
Sound
Explanation:
Q.
The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?
30
90
60
120
Explanation:
Q.
The total energy of a body executing S.H.M is directly proportional to________________?
The amplitude
The square root of amplitude
Square of an amplitude
Reciprocal of amplitude
Explanation:
Q.
Addition of vector obeys_____________?
Associative law
All given laws in A, B and C
Commutative law
Distributive law
Explanation:
Q.
In forward bias the width of potential barrier_____________?
No effect
Increases
Remains same
Decreases
Explanation:
Q.
For what value of
4
-2
2
Both A & B
Explanation:
Q.
Mohus scale is used for to measure ____________?
Temperature
Humidity
Hardness
Pressure
Explanation:
Q.
The instrument used to measure blood pressure is called____________?
Sphygmomanometer
Blood pressure
Venturimeter
Sonometer
Explanation:
Q.
In hydrogen spectrum which one of the following series lies in the ultraviolet region ?
Bracket series
Pfund series
Lymann series
Balmer series
Explanation:
Q.
Geostationary satellite completes one rotation around the earth in_______________?
3 hours
6 hours
12 hours
24 hours
Explanation:
Q.
What is wavelength of visible spectrum?
8500
7800
3900
1300
Explanation:
Q.
A photon is________________?
A unit of energy
A positively charged particle
A unit of wavelength
A quantum of electromagnetic radiation
Explanation:
Q.
The reverse of LED is______?
Diode
Photodiode
Resistor
Capacitor
Explanation:
Q.
Who were the pioneers of Physics?
Egyptians
Greek
Latin
Persians
Explanation:
Q.
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?
2
0.2
1
0.5
Explanation:
Q.
How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit) ?
730 days
129 days
329 days
365 days
Explanation:
Q.
Which of the following is not a correct representation method for prefixes______________?
Both A and B
1mm
10km
1000um
Explanation:
Q.
A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes:
behind the retina
on the blind spot
on the retina
in front of the retina
Explanation:
Q.
It is easier to turn a steering wheel with both hands than with a single hand because______________?
Two forces act on the wheel
Two hands provide a firm grip
The couple acts on the wheel
Accelerating force increases on the wheel
Explanation:
Q.
Electric current in a solid metal conductor is caused by the movement of what ?
Electrons
Protons
Metal atoms
Metal ions
Explanation:
Q.
The simplest type of rectification known as half wave rectification is obtained by____________________?
suppressing half wave of A.C supply by using diode
suppressing the harmonics in A.C voltage
using a transistor
using a Coolidge tube
Explanation:
Q.
Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?
Each remains the same
Each increase
One increases whereas that in the other decreases
Each decrease
Explanation:
Q.
Einstein
All of above are correct
1/2 mvmax2=hf-?
1/2 mvmax2=hf+?
1/2 mvmax2-hf = ?
Explanation:
Q.
The number 76.85 is rounded off up to two significant figures as_____________?
76.8
None of these
76.9
77
Explanation:
Q.
Numerical value of Boltzmanns constant is______________?
1.38
1.38
3.18
3.18
Explanation:
Q.
The back emf of a motor which is just started is_________?
Maximum
Zero
Optimum
Minimum
Explanation:
Q.
Which one is a unit vector ?
1/??3 i^ + 1/??3 j^ +1/ ??3 k^
??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^
Both B and C are correct
??3 i^ + ??3 j^ + ??3 k^
Explanation:
Q.
A 10? electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
110V
220V
220 ?2V
220/ 2V
Explanation:
Q.
Strontium-90 is used as __________________?
?-particle source
?-rays source
?-particle source
Neutron source
Explanation:
Q.
In any measurement the significant figures are______________?
Only accurately known digits
Only doubtful digits
All accurately known and all doubtful digits
All accurately known digits and the first doubtful digit
Explanation:
Q.
Gravitation force of earth is___________?
9.80 m/s
7.21 m/s
1.62 m/s
None of these
Explanation:
Q.
Semi-conductor germanium and silicon are_________________?
trivalent
divalent
tetravalent
pentavalent
Explanation:
Q.
A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
15 m
5 m
25 m
20 m
Explanation:
Q.
Which one is the dimensionally correct equation ?
V=St
S=Vit+1/2at2
V=f/t
f=vt
Explanation:
Q.
An OP-AMPs can amplify_______________?
None of the above
D.C.
A.C.
Both A.C. & D.C.
Explanation:
Q.
Radiation with wavelength longer than red lights______________?
visible radiation
ultraviolet rays
infra red radiation
X-rays
Explanation:
Q.
Which one of the following is not vector quantity _______?
Displacement
Force
Acceleration
Speed
Explanation:
Q.
A bird sitting on a high tension electric wire does not get electrocuted because:
Sit has high resistance
its feet are good insulators
it does not form a closed path for the flow of current
the body is earthed
Explanation:
Q.
The energy liberated when one atom of U-235 undergoes fission reaction is________________?
200MeV
30MeV
20MeV
40MeV
Explanation:
Q.
The error in measurement may occur due to_________________?
The faulty apprentice
The inexperience of a person
Inappropriate method
Due to all reasons in A, B and C
Explanation:
Q.
The breaking of crystals along definite direction is called _____________________?
Isotropy
Symmetry
Homogeneity
Cleavage
Explanation:
Q.
If a current carrying solenoid is suspended freely it will__________________?
be rotating
vibrating like galvanometer needle
come to rest in N-S direction
comes to rest after rotation
Explanation:
Q.
T.V sets and microwave ovens emit ___________________?
?-rays
?-rays
X-rays
?-rays
Explanation:
Q.
The bulk properties of materials such as their mode of fracture can be related to their____________________?
Polymerization
Cleavage
Microstructure
Dislocation
Explanation:
Q.
The direction of the linear velocity of a body moving in a circle is______________?
directed towards the centre
along the tangent
along the axis of rotation
directed away from the centre
Explanation:
Q.
A Circle has a number of tangents equal to _________?
2
1
Infinite
Explanation:
Q.
Pair production takes place in the vicinity of a heavy nucleus so that_____________?
Net energy is conserved
All of the above
Net charge is conserved
Net momentum is conserved
Explanation:
Q.
A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is_______________?
mg
mg
mg + ma
mg
Explanation:
Q.
In addition to the daughter nucleus and an electron or positron, the products of a beta decay
Neutrino
Neutrons
Alpha particle
Proton
Explanation:
Q.
If the axis of rotation passes through the body and the body moves around itself then the motion is called:
Spin motion
Translatory motion
Orbital motion
Rectilinear motion
Explanation:
Q.
The alternating voltage is an example of_______________?
An analogue waveform
A digital waveform
Discrete waveform
None at all
Explanation:
Q.
The operational amplifier is______________?
A low resistance amplifier
A high gain amplifier
A high resistance amplifier
A high-power amplifier
Explanation:
Q.
A train is moving with a speed of 100mph. What will be its speed in m/s.?
45 m/s
100 m/s
120 m/s
90 m/s
Explanation:
Q.
Which one of the following radiation possesses maximum penetrating power ?
?-rays
B-rays
All have the equal penetrating powe
X-rays
Explanation:
Q.
Adiabatic process is also called______________?
Isentropic process
All of the above
Heat exchange process
Heating process
Explanation:
Q.
The value of ? for diatomic gas is_______________?
1.67
? = 1.3
None
1.4
Explanation:
Q.
The bombardment of nitrogen with alpha particles will produce______________?
Positron
Neutron
Proton
Electron
Explanation:
Q.
The value of acceleration due to gravity is minimum on which of these planets?
Neptune
Mercury
Mars
Jupiter
Explanation:
Q.
A device for producing high-velocity nuclei is ________________?
Wilson cloud chamber
Cloud chamber
A mass spectrograph
Linear accelerator
Explanation:
Q.
The rectangular coordinate system is also called______________?
Polar coordinate system
Cartesian coordinate system
Cylindrical coordinate system
Spherical coordinate system
Explanation:
Q.
Which one of the following is not a donor impurity ?
arsenic
antimony
aluminium
phosphorus
Explanation:
Q.
Relation between linear velocity and angular velocity:
v=rw
r=vw
s=r
?s/?t
Explanation:
Q.
When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?
R=qmV/B
R=mV/qB
R=qmB/V
R=qB/mV
Explanation:
Q.
Rutherford in his atomic model could not explain behavior of ___________ ?
Neutrino
Protons
Electrons
Neutrons
Explanation:
Q.
In bringing an electron towards the second electron, the electrostatic potential energy of the system
remains the same
Decreases
becomes zero
increases
Explanation:
Q.
Ideal fluid is_______________?
Possess all properties
Incompressible
Steady flow
Non-viscous
Explanation:
Q.
Which one of the following radiations possesses maximum velocity ?
?-rays
?-rays
?-rays
All of above have the same speed
Explanation:
Q.
0.001 kg mass will be equivalent to_________________?
0.26 GWh
2.50 GWh
25.00 GWh
250 GWh
Explanation:
Q.
Rest mass of a photon is________________?
very small
1.67 x 10-27 kg
infinite
zero
Explanation:
Q.
The mass-energy relation is the outcome of____________?
General theory of relativity
None of these
Quantum theory
Special theory of relativity
Explanation:
Q.
In Davisson-Germer experiment the diffracted proton from crystal shows______________?
Particle property
Wave property
Light property
Quantum property
Explanation:
Q.
Gravitation force of sun is__________?
300 m/s
362 m/s
None
274 m/s
Explanation:
Q.
Radioactive materials can be identified by measuring their_______________?
Half life
Density
Mass
Hardness
Explanation:
Q.
How many electrons per second constitute a current of one micro ampere?
10 electrons
6.25
one electron
10 electrons
Explanation:
Q.
The unit of radioactivity curie is equal to________________?
3.70 x 1010 disintegration per sec
3.74 x 109 disintegration per sec
3.55 x 1010 disintegration per sec
3.60 x 1010 disintegration per sec
Explanation:
Q.
In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?
Zero
Less than D.C. value
Equal to D.C. value
More than D.C. value
Explanation:
Q.
Torque acting on a body determines_______________?
Direction of motion of the body
Linear acceleration
Acceleration
Angular acceleration
Explanation:
Q.
The Fahrenheit and centigrade scales agree to________________?
15.5
273
542
40
Explanation:
Q.
The process in which no heat enters or leave the system known as _____________?
Isobaric
Isothermal
adiabatic
Isochoric
Explanation:
Q.
At what temperature is the Fahrenheit scale reading equal to twice that of the Celsius scale?
460
160
360
280
Explanation:
Q.
Newton
every action there is an equal and opposite reaction
attraction or repulsion between two charges
volume of a given mass of gas increases or decreases
temperature remaining constant, volume of a given mass of a gas varies inversely
Explanation:
Q.
The linear momentum of an X-ray photon of wavelength 0.1A is_______________?
66.25x1023N-s
662.5x1023N-s
6.625x1023N-s
data is insufficient
Explanation:
Q.
A body in equilibrium__________________?
May be at rest or in uniform motion
May be at rest or in motion
Always in uniform motion
Always at rest
Explanation:
Q.
Zero error of the instrument is a type of_________________?
Personal error
Classified error
Random error
Systematic error
Explanation:
Q.
In multiplication and division of measurement______________?
Percentage uncertainties are added
Percentage uncertainties are divided
Absolute uncertainties are divided
Absolute uncertainties are added
Explanation:
Q.
Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to_______________?
The product of their absolute uncertainties
Sum of their absolute uncertainties
Division of their absolute uncertainties
The difference of their absolute uncertainties
Explanation:
Q.
The velocity of an oscillating charge as it moves to and fro along a wire is always_____________?
constant
changing
zero
infinite
Explanation:
Q.
In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?
impossible to predict
he/Vc
eV/h
he/ev
Explanation:
Q.
X-ray are________________?
of unknown nature
high energy electrons
radio isotopes
high energy photons
Explanation:
Q.
To measure the speed of an approaching car a police officer shines?
radio waves on it
light waves on it
microwaves on it
ultra high frequency waves on it
Explanation:
Q.
Which one is the correct representation of the unit of pressure ?
newton/meter2
Newton/meter2
Newton/Meter2
newton/Meter2
Explanation:
Q.
S.I unit of frequency is_________________?
Radian
ms-1
Vibration S-2
Hertz
Explanation:
Q.
UV radiation can be produced by______________?
Ionization of atoms
All the above
Heating the filament
Electron excitation in the gas
Explanation:
Q.
Magnetic flux and flux density are related by___________________?
flux density = magnetic flux x area
magnetic flux = flux density x area
magnetic flux = flux density / area
flux density = magnetic flux area
Explanation:
Q.
Sterilization of surgical instruments medical supplies and bandages can be done by exposing them to a beam of_______________?
?-rays
B and C have equal antiseptic propertie
?-rays
?-rays
Explanation:
Q.
For which position maximum blood pressure in the body have the smallest value ?
Sitting on chair
Sitting on ground
Laying horizontally
Standing straight
Explanation:
Q.
An example of scalar quantity is _________?
Velocity
Acceleration
Displacement
Speed
Explanation:
Q.
The average acceleration caused by gravity per second is____________?
42 feet
22 feet
52 feet
32 feet
Explanation:
Q.
An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________?
3.5 x 109 J
3.5 x 104 J
3.5 x 10-3 J
3.5 x 106 J
Explanation:
Q.
In simple cube one atom or molecule lies at its______________________?
Six corners
Eight corners
Nine corners
Force corners
Explanation:
Q.
If the velocity-time graph gives a parabolic curve then body posses______?
Constant acceleration
Zero acceleration
Variable acceleration
All of these
Explanation:
Q.
The phase of SHM describes________________?
Both displacement and direction of motion
The direction of motion only
Neither displacement nor direction of motion
Displacement only
Explanation:
Q.
Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
BINA
BINA sina
BINA tana
BINA cosa
Explanation:
Q.
The path of alpha particle is_______________?
Elliptical
Rectilinear
Curved
Zig-zag or erratic
Explanation:
Q.
The net charge on n-type material is____________________?
Neutral
Positive
Negative
Both positive and negative
Explanation:
Q.
In the transistor schematic symbol, the arrow_______________?
points form north to south
is located on the emitter
is located on the base
is locate on the collector
Explanation:
Q.
By how many times are the Electrostatic forces stronger than the Gravitational Forces for a fixed distance?
None of these
10
10
10
Explanation:
Q.
Which of the following branch of Physics deals with the internal structure of earth?
Biophysics
Plasma physics
Geophysics
Atomic physics
Explanation:
Q.
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
(F1+F2) (12-11)
(F1+F2) (122-112)
(F1+F2) (121+122)
(F1+F2) (12-11)
Explanation:
Q.
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?
8.0H
0.5H
2.0H
0.5 mH
Explanation:
Q.
Newton
Momentum
Energy
Inertia
Work
Explanation:
Q.
In which quadrant the two rectangular components of a vector have same sign ?
1st
Both 1st and 3rd
4th
2nd
Explanation:
Q.
Two vectors are A = 3i^+2j^ -k^& B = 3i^-2j^ +k^ , then_____________?
B has a negative magnitude
B is perpendicular to A
B is a negative vector of A
B is anti-parallel to A
Explanation:
Q.
The dimensions of the coefficient of viscosity are_____________?
ML1T-1
M2L-1T-1
ML-1T-1
M2L1T1
Explanation:
Q.
A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.
The resistance of copper increases and that of germanium decreases
The resistance of each of them increases.
The resistance of each of them decreases.
The resistance of copper decreases and that of germanium increases.
Explanation:
Q.
If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
? = NIAB sin?
? = NIAB cos?
? = NIAB
? = NIAB tan?
Explanation:
Q.
If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?
Up
North
West
Down
Explanation:
Q.
The value of resistivity for insulator is of the order of____________?
105 ohm metre
107 ohm metre
106 ohm metre
108 ohm metre
Explanation:
Q.
One light year is equal to________________?
9.5x1015m
9.5x1015cm
9.5x1015Km
9.5x1015sec
Explanation:
Q.
Electrons_________________?
Can exist inside the nucleus
Can exist both inside and outside the nucleus
Do not know
Cannot exist inside the nucleus
Explanation:
Q.
The cross product of two vectors is a negative vector when______________?
They are parallel vectors
They are anti parallel vectors
They are a perpendicular vector
They are rotated through 270
Explanation:
Q.
Ground state energy of the 4th orbit in a H-atom is_____________?
0.85 eV
3.40 eV
13.60 eV
1.51 eV
Explanation:
Q.
Power of a lens is one diopter if its focal length is
2 meter
1 meter
Explanation:
Q.
Irregular flow of fluid is called_______________?
Uniform
Laminar
Turbulent
Streamline
Explanation:
Q.
The characteristic X-rays spectrum is due to_____________?
The bombardment of the target by protons
The bombardment of target by electrons
The absorption of radiation by the target metal
The illumination of the target metal by ultra-violet radiation
Explanation:
Q.
Steradian is the SI unit of________________?
Neither plane angle nor solid angle
Solid angle
Plane angle
Both plane angle and solid angle
Explanation:
Q.
The first overtone of a stretched string of given length is 320 Hz. The first harmonic is_________?
320 Hz
480 Hz
160 Hz
640 Hz
Explanation:
Q.
1 Weber / m
3
1/3
One gauss
10? gauss
Explanation:
Q.
For the successful operation of Heat engine which condition should be met ?
none of these
cyclic process
both A and B
operated at certain temperature difference
Explanation:
Q.
Boltzman constant K in terms of universal gas constant R and Avagadros number Na is give as_______________?
K = R/Na
K = Na/Ra
K = RNa
K = nRNa
Explanation:
Q.
For a simple pendulu,m the restoring force is caused by________________?
Spring
Hand
All of these
Gravity
Explanation:
Q.
To reduce the uncertainty in the timing experiment______________?
Count number of vibration
Highly precise instrument
Both a and C
Conduct at room temperature
Explanation:
Q.
The specially designed semi-conductor diodes used as fast counters in electronic circuits are______________?
Solar cells.
The light emitting diodes
Photo voltaic cell
Photo diodes
Explanation:
Q.
Geiger counter is suitable for _________________?
Slow counting
Extremely fast counting
Fast counting
All situations
Explanation:
Q.
n instrument which can measure potential without drawing any current is_____________________?
cathode ray oscilloscope (CRO)
galvanometer
ammeter
Explanation:
Q.
As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?
remain the same
shifts towards longer as well as shorter wavelengths
shifts towards longer wavelength
shifts towards shorter wavelength
Explanation:
Q.
The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
use a very strong magnetic field
use a very long and fine suspension
use a coil of very large area
use a coil with very large number of turns
Explanation:
Q.
Which of the following is not derived quantity________?
Volume
Area
Time
Density
Explanation:
Q.
SI unit of torque is______________?
N.m
joule
Neither a nor b is correct
Both a and b are correct
Explanation:
Q.
The Capacity of doing work is called_________?
Energy
Work
Power
Momentum
Explanation:
Q.
For a gas obeying Boyles law if the pressure is doubled the volume becomes________________?
one half
four times
double
one fourth
Explanation:
Q.
Two parallel beams of positrons moving in the same direction will________?
attract each other
repel each other
not interact with each other
be deflected normal to the plane containing the two beams.
Explanation:
Q.
The electrons in conduction band are free to___________________?
Transport charge
Transport impulses
Transport signals
Transport vibrations
Explanation:
Q.
The work done in the isochoric process is________________?
zero
depends on situation
variable
constant
Explanation:
Q.
Pair production can take place only with_________________?
IR-rays
UV-rays
X-rays
Gamma rays
Explanation:
Q.
The angular speed for daily rotation of the earth in rad S-1 is______________?
7.3 x 10-5 radians/second
3.7 x 10 7.3 x 5 radians/second
7.3 x 10 radians/second
7.3 x 5 radians/second
Explanation:
Q.
The mass of an object will get doubled at the speed of __________?
2.6
2.6
2.6
2.6
Explanation:
Q.
According to equation of continuity A1V1 = A2V2 = constant. The constant is equal to_______________?
Flow rate
Volume of fluid
Mass of fluid
The density of the fluid
Explanation:
Q.
The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine_______________?
averagely
at any instant
during one cycle
during its operation
Explanation:
Q.
In the electron microscope, electric & magnetic fields are used as_______________?
Source of electromagnetic waves
Electromagnetic gun
Converging source of electrons
Deflecting charged particle
Explanation:
Q.
Which of the following is not a unit of length?
angstrom
light year
radian
micron
Explanation:
Q.
Which one is not a type of dynamic equilibrium ?
Both A and C are corret answer
Translational equilibrium
Static equilibrium
Rotational equilibrium
Explanation:
Q.
Why the needle of iron swims on water surface when it is kept gently ?
due to surface tension
the density of needle is less than that of water
It will remain under the water, when it will displace more water than its weight
due to its shape
Explanation:
Q.
Radiations are used for the treatment of skin of a patient is_______________?
Gamma rays
Beta rays
Alpha rays
X-rays
Explanation:
Q.
Systolic pressure is called_______________?
Low blood pressure
High blood pressure
Abnormal blood pressure
Normal blood pressure
Explanation:
Q.
If the distance-time graph gives a straight line then body possesses___________?
Uniform Velocity
None
Variable Velocity
Zero Velocity
Explanation:
Q.
The diameter of an atom is approximately_______________?
10-10m
10-11m
10-12m
10-14m
Explanation:
Q.
CGS unit of Force is_________?
Dyne
Joule
Erg
Newton
Explanation:
Q.
Hydrogen atom does not emit X-rays because _________________?
its energy levels are too far apart
it is too small in size
its energy levels are too close to each other
it has a single electron
Explanation:
Q.
A photostat machine works on _____________?
thermal image making
magnetic image making
electrostatic image making
electromagnetic image making
Explanation:
Q.
Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?
2 f
zero
focus
f/2
Explanation:
Q.
A wheat stone bridge is said to be balanced when____________________?
maximum current flows through the galvanometer branch
potential difference across galvanometer branch is maximum
minimum current flows through the galvanometer branch
potential difference across galvanometer branch is zero
Explanation:
Q.
Length, mass, time, intensity of light and amount of substance are examples of ____________?
Prefixes
Derived quantities
Quartile quantities
Base quantities
Explanation:
Q.
The name of the photon for quantum of light was proposed by________________?
Thomson
Einstein
Plank
Ampere
Explanation:
Q.
Mass of neutron is________________?
1.67 x 10-19 kg
1.67 x 10-27 kg
1.67 x 10-31 kg
9.1 x 10-31 kg
Explanation:
Q.
The charge on beta particle is________________?
-2
-1
1
+2
Explanation:
Q.
Mach is the unit of measurement in stating the speed of a moving object in relation to__________?
The speed of light
The speed of other object
The speed of sound
The speed of air resistance
Explanation:
Q.
Which one of the following has the greatest energy gap ?
any of above
insulator
conductor
semi conductor
Explanation:
Q.
Waves emitted from the antenna are__________________?
Modulated waves
Electromagnetic waves
Radio waves
Sound waves
Explanation:
Q.
Rainbow is seen after rain because of hanging molecules of water which act as __________?
Prism
Lens
Mirror
Slabs
Explanation:
Q.
Average energy required to remove one nucleon from the nucleus is called__________________?
All of above
Energy of decay
Destruction energy
Binding energy per nucleon
Explanation:
Q.
Optics does not deal with ___________?
Characteristics of sound
Lenses and mirrors
Properties of light
Nature of light waves
Explanation:
Q.
The relation between linear and angular acceleration is______________?
a = a x r
a = r x a
a = a x r
r = a x a
Explanation:
Q.
A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?
400 C m
100 C m
200 C m
300 C m
Explanation:
Q.
Joule Thomson effect is based upon __________ ?
Sudden expansion of gases
Cooling of gases
Sudden compression of gases
Heating of gases
Explanation:
Q.
An ideal standard of measurement of a base quantity has characteristics_______________?
Transportable
Only a and b are correct
Invariable
Accessible
Explanation:
Q.
The diameter of a lens is called________________?
aperture
principal axis
focal length
radius of curvature
Explanation:
Q.
During fusion of hydrogen into helium________________?
Energy is released
Mass is reduced due to the energy released
Energy is absorbed
Mass is increased due to energy absorption
Explanation:
Q.
In an electronic transition atom cannot emit______________?
Ultraviolet rays
Infra red radiation
?-rays
Visible light
Explanation:
Q.
The product of the frequency and time period is equal to_________________?
2
4
1
3
Explanation:
Q.
The unit of force in CGS, system is __________?
Newton
Dyne
Pound
None of these
Explanation:
Q.
The internal energy of the system increases__________?
in isothermal expansion
in adiabatic compression
in isothermal compression
in adiabatic expansion
Explanation:
Q.
The natural frequency of simple pendulum depends upon_______________?
Square of its length
It
The square root of its length
It
Explanation:
Q.
p-n junction when reversed biased acts as a_______________?
on switch
off switch
capacitor
inductor
Explanation:
Q.
The least distance of distinct vision for a normal eye is_______________?
15 cm
25 cm
40 cm
30 cm
Explanation:
Q.
Mass-Energy relation given by Einstein in represented as: ____________?
E=m
E=hf
E=mv
E=mc
Explanation:
Q.
What is the SI unit of acceleration is ___________?
Meter per secound
meter per second square
All
Both
Explanation:
Q.
A digit zero in a measurement__________________?
Always insignificant sign
Significant only if left to a significant figure
Always significant
May be significant may not significant
Explanation:
Q.
Electromagnetic waves emitted from antenna are________________?
Longitudinal
Transverse
Stationary
All the above
Explanation:
Q.
The number of significant figures in the length of a bar 6200mm measured by meter rod is_______________?
None of these
3
4
2
Explanation:
Q.
If Ax is -ve and Ay is +ve, the resultant is:___________?
2nd
3rd
1st
4th
Explanation:
Q.
The normal blood pressure range for a human body is______________?
120 to 60 torr
60 to 140 torr
100 to 80 torr
120 to 80 torr
Explanation:
Q.
Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
all of the above
the frequency of incident light and work function of the metal surface
the threshold frequency for the metal surface
the intensity of incident light
Explanation:
Q.
In case of a simple pendulum, the cause of damping is__________________?
Gravity
Tension in the string
None of these
Drag force of air
Explanation:
Q.
What is the SI unit of modulus of elasticity of substance ?
Nm-1
Jm-2
Being a number it has no unit.
Nm-2
Explanation:
Q.
Field particle of Electromagnetic interaction is _________?
Meson
Photon
Vector Boson
Graviton
Explanation:
Q.
The SI unit of Heat is________?
Newton
Joule
Volt
Watt
Explanation:
Q.
The effect of the decrease in pressure with the increase of the speed of the fluid in a horizontal pipe is known as______________?
Bernoulli effect
Stokes effect
Venturi effect
Torricelli effect
Explanation:
Q.
A choke is used as a resistance in_________________?
DC circuit
Both AC and DC circuit
Full wave rectifier circuit
AC circuits
Explanation:
Q.
X-rays are similar in nature to_______________?
?-rays
Beta rays
Positive rays
Cathode rays
Explanation:
Q.
A cup of milk is placed in a microwave oven. Tell which statements is false. (1) Milk will be heated up only. (2) Cup will remain cool. (3) Both cup and mild will get hot ?
None
1
2
3
Explanation:
Q.
Unit vector n^ is along______________?
Y-axis
Z-axis
X-axis
Normal on a surface
Explanation:
Q.
X-rays are diffracted by a crystal but not by a diffraction grating because_____________?
The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
The ions in a crystal are well arranged
The lines in a diffraction grating cannot reflect X-rays.
The penetration power of X-rays is high in a diffraction grating
Explanation:
Q.
If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then______________?
A. B = Ax By + Ay Bz + Az By
A. B = Ay Bz + Az By + Az Bx
A. B = Ax Bx + Ay By + Az Bz
A. B = Ax Bz + Ay By + Az Bx
Explanation:
Q.
For chain reaction to build up the size of the radioactive target should be______________?
Equal to the critical size
All of above can build up a change reaction
Less than the critical size
Greater than the critical size
Explanation:
Q.
A million electron are added to a pith ball. Its charge is________?
Explanation:
Q.
Earth
45 km/s
70 km/s
30 km/s
60 km/s
Explanation:
Q.
The frequency of the second pendulum is________________?
0.5 hertz
1.5 hertz
1 hertz
2.5 hertz
Explanation:
Q.
Due to the relative motion of observer and frame of reference time:
Dilates
Contracts
Constant
Uniform
Explanation:
Q.
Ina liquid metal fast breeder reactor, the type of uranium used is______________?
92U235
92U239
92U238
92U234
Explanation:
Q.
If a diffraction grating is placed in the path of a light beam it reveals______________?
Wave property
Particle property
Energy particle
Electromagnetic wave property
Explanation:
Q.
The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?
9.1 x 10-18m
4 x 10-10m
3.11 x 10-10m
6.2 x 10-10m
Explanation:
Q.
When K.E energy of SHM is maximum its__________________?
P.E is zero
All P.E acceleration and restoring force are zero
Acceleration is zero
Restoring force is zero
Explanation:
Q.
The standard vector symbol for flux density is ____________________?
H
L
M
B
Explanation:
Q.
Thermions are________________?
positrons
electrons
protons
photons
Explanation:
Q.
An A.C series circuit containing 4? resistance and 3? inductive reactance. The impedance of the circuit is______________?
1?
7?
5?
7?
Explanation:
Q.
Compton effect proves the________________?
Uncertain nature of light
Wave nature of light
Photon theory of light
Dual nature of light
Explanation:
Q.
CGS system of units is also called __________?
None of these
Metric system
Metric or French system of units
Metric or British system of units
Explanation:
Q.
One pico stands for_________________?
10 raised to power -15
10 raised to power -9
10 raised to power -12
10 raised to power -6
Explanation:
Q.
To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?
3
2
4
5
Explanation:
Q.
Which of the following pair of forces can produce a resultant of 8N?
3N & 6N
2N & 5N
20N & 2N
4N & 1N
Explanation:
Q.
Forward current through a semi conductor diode circuit is due to____________?
holes
electron
minority carriers
majority carriers
Explanation:
Q.
pure resistor circuit the voltage and current are_______________?
No phase difference
Lagging each other
They have zero phase difference
They are at 90? phase difference
Explanation:
Q.
Terminal velocity is_____________?
Maximum
Neither uniform nor maximum
Uniform and maximum
Uniform
Explanation:
Q.
Which one of the following possesses greater penetration power ?
?-rays
?-rays
?-rays
Neutron-rays
Explanation:
Q.
Electron moves in the orbit as________________?
S.H.M likes the sound
Standing wave motion
Vibratory motion like up and down
Simple vibratory motion
Explanation:
Q.
The device or circuit used for conversion of A.C. into D.C. is called_______________?
Filtering circuit
A rectifier
Converter.
An amplifier.
Explanation:
Q.
The working of transistor as amplifier is similar to________________?
Step up transformer
Step down transformer
Triode vacuum tube
Three diodes in common
Explanation:
Q.
Acceptor and donor impurities donate______________?
p-carriers and n-carriers respectively
n-carriers and p-carriers respectively
n-carriers only
p-carriers only
Explanation:
Q.
Bernoulli
Both laminar and turbulent flow
Turbulent flow
None of these
Laminar flow
Explanation:
Q.
In S.H.M. the velocity of a particle is maximum at________________?
middle between the mean and extreme position on the right side
mean position
extreme position
middle between the mean and extreme position on the left side
Explanation:
Q.
Radioactive decay obeys which one of the following law ?
N=Noe-?t/2
N=Noe-?t
No=N(1+e?t)
N=Noe?t
Explanation:
Q.
Metabolism is the name of a process in which energy transformation takes place within______________?
Heat engine
Laboratory
Atmosphere
Human body
Explanation:
Q.
The equation of continuity is obtained by applying in the law of conservation of_____________?
Energy
All
Momentum
Mass
Explanation:
Q.
In full wave rectification the output D.C. voltage across the load is obtained for_____________?
The positive half cycle of input A.C.
All of the above.
The complete cycle of input A.C.
The negative half cycle of input A.C.
Explanation:
Q.
Sphygmomanometers measures blood pressure ?
Some time static and sometimes dynamic
None of these
Statically
Dynamically
Explanation:
Q.
A black body has the property to _____________ all the radiation entering it.
Absorb
Reflect
Exude
None of these
Explanation:
Q.
Which of the following radiations are suitable for the treatment of an infection in the interior of the body ?
?-rays
?-rays
X-rays
?-rays
Explanation:
Q.
A capacitor of capacitance 30
0.9x102sec
1.5x105sec
0.9sec
15 sec
Explanation:
Q.
Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?
The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
Number of incident electron i.e. filament current
The soft target which can easily emit electrons
All of above are correct
Explanation:
Q.
What is the angle that the given vector makes with y-axis and A=2i+3j ?
60
90
30
120
Explanation:
Q.
The curie temperature is that at which ____________________?
Metals become super conductor
Semi-conductor becomes conductors
Ferromagnetic becomes paramagnetic
Paramagnetic becomes diamagnetic
Explanation:
Q.
Which one is the derived quantity in SI units _____________?
Amount of substance
Plane angle
Electric current
Electric charge
Explanation:
Q.
Nuclear forces exist between ___________________?
Proton-neutron
Proton-proton
Neutron-neutron
All of the above
Explanation:
Q.
Gas molecules of different masses in the same container have the same average transnational kinetic energy which is directly proportional to their_____________?
volume
pressure
time
absolute temperature
Explanation:
Q.
The turning effect of force is called_________?
Momentum
Moment
None of these
Torque
Explanation:
Q.
An electric motor could be used as a: ___________?
Battery
Dynamo
Capacitor
Transformer
Explanation:
Q.
Ceramic magnets are_______?
None of these
Insulators
Semiconductors
Conductors
Explanation:
Q.
Which one of the following material is most suitable for making core of an electromagnet ?
steel
soft iron
Cu-Ni alloy
air
Explanation:
Q.
When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?
At L will be more than at C
Same
Different
At L will be less than at C
Explanation:
Q.
If electrical conductivity increases with the increase of temperature of a substance, then it is a:
None of the above
Semiconductor
Conductor
Insulator
Explanation:
Q.
In optic fiber transmission system _____________ are used regenerate the dim light signal?
Transformer
Diodes
Laser
Repeaters
Explanation:
Q.
The SI unit of force constant is identical with that of__________________?
Loudness
Surface tension
Force
Pressure
Explanation:
Q.
Michelson devised the formula to calculate the speed of light_______________?
C = 5/2fd
C = 8fd
C = 4fd
C = 16fd
Explanation:
Q.
The force responsible for the vibratory motion of the simple pendulum is_________________?
mg sin?
mg cos?
mg ton?
mg
Explanation:
Q.
An alpha particle in a single encounter__________________?
Losses most of its energy
Loses all of its energy
Loses no energy at all
Loses a small fraction of its energy
Explanation:
Q.
When X-rays are passed through successive aluminum sheets what happens to their thickness ?
it remains same
sometimes increases and sometimes decreases
increases
it decreases
Explanation:
Q.
The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?
a spiral
an ellipse
helix
a circle
Explanation:
Q.
Two identical metal balls with charges + 2Q and
F/4
F/2
F/8
F
Explanation:
Q.
According to Einstein, the gravitational interaction is possible between_______________?
electromagnetic radiations
material objects and electromagnetic radiation only
material objects only
none of the above
Explanation:
Q.
If vectors a and b are antiparallel to each other then their resultant is ___________?
2a
a+b
2b
a?b
Explanation:
Q.
An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a ______________?
Output
Reference voltage on the other
Non-inverting voltage at output
Virtual input
Explanation:
Q.
When two charges are placed in water then the Coulomb force between them reduces to _____________?
1/3 times
1/2 times
1/78 times
1/58 times
Explanation:
Q.
What is the outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s ?
100N
1N
2N
10N
Explanation:
Q.
The device used for conversion of D.C. to A.C. is called______________?
Converter
Inverter
Oscillator
A rectifier
Explanation:
Q.
The dimension of velocity are __________?
LT
LMT
LT^-1
LMT^-1
Explanation:
Q.
Null vector is a vector which has________________?
Both A and B are not correct
No specified direction
Both A and B are correct
Zero magnitude
Explanation:
Q.
We have two bodies, One is moving with 2m/s velocity and other is at rest, which one has greater inertia?
Body is at rest
Both have same inertia because inertia depends upon mass only
Moving body
Both have not any inertia
Explanation:
Q.
The existence of Ether wind was experimentally rejected by__________________?
zero
double of its rest mass
equal to its rest mass
infinite
Explanation:
Q.
The audio signals of TV are _____________?
Velocity modulated
Frequency modulated
fixe modulated
Amplitude modulated
Explanation:
Q.
Speed of efflux can be determined by applying______________?
Bernoulli
Venture relation
Torricelli
All
Explanation:
Q.
An object travels at constant speed around a circle of radius 1.0 m in 2.0 seconds. What is the magnitude of its acceleration?
?
2
4
Explanation:
Q.
Which of the following will be a better shield against gamma rays ?
Aluminum
Lead
Heavy water
Ordinary water
Explanation:
Q.
An angle between two vectors A and B can be determined by_____________?
Their dot product
Head to tail rule
Right-hand rule
Their cross product
Explanation:
Q.
Unit vector is used to specify the _____________?
Velocity
Frequency
Direction of vector
Magnitude
Explanation:
Q.
Displacement of the body in S.H.M is equal to amplitude when the body is at_______________?
None
Elsewhere
Extreme position
Mean position
Explanation:
Q.
Final image produced by a compound microscope is_____________?
real and erect
virtual and inverted
real and inverted
virtual and erect
Explanation:
Q.
SI unit of the coefficient of viscosity is___________________?
Kg.m.S-1
Kg m-1.S-1
Kg-1.m-1.S-1
Kg.m.S
Explanation:
Q.
A photon of wavelength 900nm behaves like a particle of mass______________?
2.46 x 10-36kg
0 kg.
1.84 x 10-44kg
5.53 x 10-36kg
Explanation:
Q.
In scientific notation, numbers are expressed in________________?
Decimal
Power of ten
Powers of two
Reciprocal
Explanation:
Q.
Who discovered the inverse square law for gravity ?
Einstein
Plank
Newtons
Galileo
Explanation:
Q.
A body will be in complete equilibrium when it is satisfying______________?
1st condition of equilibrium
Both Ist and 2nd condition of equilibrium
Impossible
2nd condition of equilibrium
Explanation:
Q.
The flow of ideal fluid is always_______________?
Straight line
Streamline
Turbulent
Irregular
Explanation:
Q.
An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?
5000 H
zero
5 H
5 mH
Explanation:
Q.
A vector which has magnitude one is called _________?
A resultant vector
A position vector
A null vector
A unit vector
Explanation:
Q.
At Murree Hills (Assume the value of g changes). If we use a simple pendulum as time standard then one-second duration will_____________?
Remains the same
Is zero
Increase
Decrease
Explanation:
Q.
In the capacitive circuit the current___________________?
Is in phase with voltage
Opposite in phase of voltage by ?
Leads forward the voltage by ?/2
Lags behind voltage by ?/2
Explanation:
Q.
A potential difference is applied across the ends of a wire. If the potential difference is doubled, then the drift velocity of free electron will.
be halved
remain unchanged
be doubled
be quadrupled
Explanation:
Q.
Electromagnetic waves travel in free space with the speed of___________________?
More than sound waves
?-rays
Cathode rays
Positive rays
Explanation:
Q.
A vacant or partially filled band is called _____________________?
Forbidden band
Conduction band
Valence band
Empty band
Explanation:
Q.
If a wire has a resistance of 0.5 ohm, then its conductance is:
5 S
2 S
1.5 S
1 S
Explanation:
Q.
When average and instantaneous velocities become equal then body possess_______?
Uniform Velocity
Uniform Acceleration
Variable Velocity
Variable Acceleration
Explanation:
Q.
In p-n-p transistor the collector current is________________?
equal to emitter current
slightly less than emitter current
any of above
greater than emitter current
Explanation:
Q.
One radian is equal to______________?
57.3
87.3
67.3
60
Explanation:
Q.
Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is
1 J
0.125 J
0.50 J
0.250 J
Explanation:
Q.
Three students measured the length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is a correct record ?
Only (i)
Only (iii)
Only (ii)
Both (i) and (ii)
Explanation:
Q.
Maximum number of components of a vector may be________________?
Infinite
1
2
3
Explanation:
Q.
A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
2 volt
0.4 volt
4 volt
5 volt
Explanation:
Q.
The velocity of the mass attached to a spring is maximum at_______________?
Both A and B
Mean position
Extreme position
None
Explanation:
Q.
Velocity of fluid increases where the pressure is________________?
Changes continuously
Constant
Low
High
Explanation:
Q.
The charge on an electron was determine by ________________?
Maxwell
Ampere
Millikan
Thomson
Explanation:
Q.
One torr is equal to_________________?
1.333 Nm-2
13.33 Nm-2
133.3 Nm2
.1333 Nm-2
Explanation:
Q.
A force applied on a body through the string is called_________?
Momentum
Weight
Tension
Torque
Explanation:
Q.
If the length of the second pendulum becomes four times, then its time period will become________________?
2 times
4 times
8 times
6 times
Explanation:
Q.
A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is______________?
Equal to the weight of the stone
Zero
Maximum
Less than the weight of the stone
Explanation:
Q.
A transmitting station emits radio waves of wavelength ? at power P. If h is Planck
Speed of sound
Speed of lightB.
h
?
Explanation:
Q.
If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
One half
None
Four times
Twice
Explanation:
Q.
In normal state of energy the incident high energy photons will be______________?
Cause laser production
Stimulated
Absorbed
Cause X-ray emission
Explanation:
Q.
Various types of cancer are treated by_________________?
Nickel-63
Cobalt-60
Carbon-14
Strontium-90
Explanation:
Q.
The most suitable unit for expressing nuclear radius is_______?
Angstrom
Nano meter
Micro
Fermi
Explanation:
Q.
When A.C current passes through a capacitor then the current relationship will be_______________?
The voltage leads current by phase angle is 90 degrees
The current lead voltage by phase angle is 90 degrees
The voltage leads current by phase angle is 45 degrees
The current lead voltage by phase angle is 45 degrees
Explanation:
Q.
Concentration of red cells in blood is about______________?
50%
75%
40%
25%
Explanation:
Q.
Reflecting mirrors in laser is used to______________?
All
For producing more energetic lasers
Lasing more
Further stimulation
Explanation:
Q.
Which of the following are not deflected by electric and magnetic fields ?
None of these
Beta rays
Gamma rays
Alpha rays
Explanation:
Q.
X-rays are electromagnetic waves like________________?
Light waves
?-rays
Microwaves
Heat waves
Explanation:
Q.
Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
B & C
A & B
A B & C
A & C
Explanation:
Q.
The slope of velocity-time graph gives_______?
Acceleration
Velocity
Speed
All of these
Explanation:
Q.
A football is kicked at 45 degrees with horizontal with K.E of E. Its K.E. at highest point is
Zero
E/2
E
E/(2)
Explanation:
Q.
The waves which are used for line of sight (LOS) communication are called:
Antenna waves
Space waves
Cable waves
None of these
Explanation:
Q.
The anti-matter is composed of: __________________?
Anti-proton
Anti-neutron
Anti-electrons
All of these
Explanation:
Q.
The minimum wavelength of X-rays can further be reduced by _______________?
Using a target element of higher atomic number
Increasing the potential difference between the cathode and the target
Reducing the pressure or cooling the target
Increasing the temperature of the filament.
Explanation:
Q.
Which one is true for internal energy ?
It is a state function of a system
It is sum of all forms of energies associated with molecules of a system
All are correct
It is proportional to transnational K.E of the molecules
Explanation:
Q.
Energy needed to magnetize and demagnetize is represented by _________________?
Hysteresis loop
Hysteresis loop area
Straight line
Hysteresis curve
Explanation:
Q.
Least distance of distinct vision_____________?
becomes infinite after 60 years
increases with increase in age
neither increases nor decreases
decreases with increase in age
Explanation:
Q.
Venturi meter is used to measure_________________?
Fluid speed
None
Fluid density
Fluid pressure
Explanation:
Q.
The carburettor of a car is an application of_______________?
Venturi meter
None
Bernoulli equation
Both A and B
Explanation:
Q.
In He-Ne laser the lasing action is produced by_______________?
Electrons of He
Electrons Ne
He-Ne both
Ne only
Explanation:
Q.
Non-inverting amplifier circuits have____________?
A very low input impedance
A very high input impedance
None of the above
A low output impedance
Explanation:
Q.
A.C. and D.C. have the same __________?
Affect in charging a capacitor
Affect while passing through an inductance
Heating effect through a resistance
Affect in charging a battery
Explanation:
Q.
An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ?
224
220
222
226
Explanation:
Q.
Young
Liquid only
All of the above
Solid only
Gas only
Explanation:
Q.
For anti-parallel vectors angle is equal to ____________?
270
180
None of these
90
Explanation:
Q.
The vector A= 2i^+2j^ makes_______ angle with x-axis.?
30
60
45
90
Explanation:
Q.
Which of the following pairs does not have identical dimensions ?
Momentum and impulse
Energy and work
Mass and moment of inertia
Torque and energy
Explanation:
Q.
The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?
Cadmium rods
Platinum rods
Graphite rods
Iron rods
Explanation:
Q.
The power of a concave lens is_______________?
real
virtual
positive
negative
Explanation:
Q.
Product of time period and frequency is ____________?
Unity
Velocity
Frequency
Time period
Explanation:
Q.
Mirage is an example of ___________?
Refraction and total internal reflection of light
Scattering of light
reflection of light
refraction of light
Explanation:
Q.
A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________?
K.E hoop = 4K.E disc
K.E hoop = 1/2K.E disc
K.E hoop = 2K.E disc
K.E hoop = K.E disc
Explanation:
Q.
A uniform steel wire of length 4m and area of cross-section 3
0.50J
0.75J
0.100J
0.025J
Explanation:
Q.
Which quantity is a state function_______________?
pressure
internal energy
volume
heat supply
Explanation:
Q.
As a result of annihilation of electron and positron, number of ?
Four
One
Two
Three
Explanation:
Q.
If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is______________?
5 rad. S-1
1.6 rad. S-1
2.8 ms-1
4 rad. S-1
Explanation:
Q.
A magnetic compass will be deflected if it is kept near a____________________?
none
charge in motion
both
charge at rest
Explanation:
Q.
When the amplitude of a wave becomes double its energy become_________________?
Double
Four times
One half
None time
Explanation:
Q.
The direction of a vector in space is specified by_______________?
Three angle
One angle
No angle
Two angle
Explanation:
Q.
Coercive force is the force which opposes ____________________?
Extension
Demagnetization
Surface cracking
Breakage
Explanation:
Q.
If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?
1/10th
1/6th
None of these
1/8th
Explanation:
Q.
In a semiconductors the charge carriers are ___________________?
Holes only
All of the above
Electron and holes both
Electrons only
Explanation:
Q.
The cross product i^ x j^ is equal to_______________?
One
k^
Zero
i^
Explanation:
Q.
SI unit of flux density is____________________?
NAm-1
NA-1m-1
NmA-2
NmA-1
Explanation:
Q.
A magnetic field___________________?
always exerts a force on a charged particle
exerts a force if the charged particle is moving perpendicular to the magnetic field lines
never exerts a force on a charged particles
exerts a force if the charged particle is moving in the direction of the magnetic field lines
Explanation:
Q.
The radius of geostationary orbit from the centre of the earth is nearly______________?
24000 km
18000 km
42000km
36000km
Explanation:
Q.
In obtaining an X-ray photograph of our hand we use the principle of______________?
photo electric effect
any of above
ionization
shadow photograph
Explanation:
Q.
Study of sound is called _____________?
Acoustics
Physiology
Soundlogy
Neurology
Explanation:
Q.
The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?
2i^
(2i^
(2i^
(2i^
Explanation:
Q.
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
(R+2?fL)
R+1/2?fL
(R2+f2L2)
(R2+4?2f2L2)
Explanation:
Q.
Unit of G is ______________?
None
Nm2Kg
Nm2Kg-2
Nm2Kg2
Explanation:
Q.
A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
independent mass m
directly proportional to B
directly proportional to m
directly proportional to q
Explanation:
Q.
Pair production cannot take place in a vacuum as ________________?
Mass is not conserved
The chargee is not conserved
Momentum is not conserved
Energy is not conserved
Explanation:
Q.
Value of permeability of free space in SI units is___________________?
4?x10-8 WbA-1m-1
4?x10-9 WbA-1m-1
4?x10-10 WbA-1m-1
4?x10-7 WbA-1m-1
Explanation:
Q.
For what displacement the P.E becomes 1/4 of its maximum value ?
x = x
x = x(2)
x = x
x = x
Explanation:
Q.
In cricket when a bowler produce reverse swing the ball will move towards______________?
Rough side
The shinning side of the ball
The seam of the ball
Goes straight
Explanation:
Q.
The least count of Vernier caliper is ________ containing 10 Vernier scale divisions?
0.0001mm
0.1mm
0.001mm
0.01mm
Explanation:
Q.
Which instrument is used to detect path of visible rays?
None of the above
Wilson Cloud Detector
Solid State Detector
Geiger counter
Explanation:
Q.
The critical speed of an artificial satellite is_______________?
8 ms-1
8 Kms-1
7.9 Kms-1
8.1 Kms-1
Explanation:
Q.
The energy absorbed by a body is __________________ at resonance?
Maximum only
Maximum as well minimum
Minimum only
Explanation:
Q.
Newton
Inertial frame of reference
Non-inertial frame of reference
None
Accelerated frame of reference
Explanation:
Q.
Matter itself has energy called ________?
Nuclear energy
Chemical energy
Potential energy
Rest energy
Explanation:
Q.
An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?
Linear Velocity
None of the above
Angular Displacement
Angular Momentum
Explanation:
Q.
The direction of the vector product is given by______________?
Right-hand rule
Head to tail rule
Triangular rule
Left-hand rule
Explanation:
Q.
When a projectile moves upward , its vertical component of velocity?
None of these
Decrease
Remains same
increase
Explanation:
Q.
A particle having the mass of an electron and the charge of a proton is called a______________?
Photon
Positron
Antiproton
Gamma rays
Explanation:
Q.
Number of significant figures in 0.0173 is_________________?
5
4
2
3
Explanation:
Q.
Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property_____________?
A & B
B & C
C & A
A B & C
Explanation:
Q.
Farad is the unit of___________?
inductance
capacitance
voltage
None of these
Explanation:
Q.
A vector can be multiplied by a number. The number may be_______________?
Dimensionless
All A, B and C are correct
Dimensional scalar
Negative
Explanation:
Q.
In Compton scattering, the change in wavelength is maxed if_______________?
The angle of scattering is 90
The angle of scattering is 180
The angle of scattering is 60
The angle of scattering is 0
Explanation:
Q.
Which of the following is a good moderator?
Helium
Graphite
Ordinary Water
Cadmium
Explanation:
Q.
Electrical resonance is observed in_______________?
Both in radio and microwave oven
Microwave oven
Radio
Neither in radio nor in a microwave oven
Explanation:
Q.
The span of the broad jump depends upon_______________?
None
Angle of projection
Height of jump
Mass of the jumper
Explanation:
Q.
The sharpness of resonance is__________________?
Inversely proportional to the damping force
Equal to the square of damping force
Directly proportional to the damping force
Equal to the square of damping force
Explanation:
Q.
The planet nearest to the earth is______________?
Uranus
Mercury
Venus
Sun
Explanation:
Q.
Coefficient of viscosity of honey is greater than______________?
Milk
Water
Charcoal
Water
Explanation:
Q.
Average translational kinetic energy per molecule of an ideal gas is given by_____________?
3RT/2Na
3Na/2RT
3NaT/2R
2NaT/3
Explanation:
Q.
What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
10A
1000A
100A
1A
Explanation:
Q.
If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self-sustained and is known as __________________?
Fusion reaction
Chain reaction
Chemical reaction
Fission reaction
Explanation:
Q.
In the nucleus of uranium, the number of neutrons will be _____________?
92
143
235
Different for different isotopes
Explanation:
Q.
Michelson calculated the speed of light using the instruments______________?
spectrometer
interferometer
galvanometer
none of these
Explanation:
Q.
Radiation produced from TV picture tube is_____________?
B-rays
Far infrared
X-rays
Infrared
Explanation:
Q.
Nuclei having the same mass number but different atomic number are____________?
Isomers
Isotopes
Isobars
Isotones
Explanation:
Q.
Normal human body temperature 98.6
42
55
410
37
Explanation:
Q.
The blood flow is _______________ flow at systolic pressure?
Mixed
Turbulent
None
Laminar
Explanation:
Q.
The uncertainty in momentum & position is due to its_____________?
Emission of the certain wavelength
Two-dimensional motion
Very high velocity
Property of matter and radiation
Explanation:
Q.
Terminal velocity of the body is directly proportional to the_______________?
Size of the body
The diameter of the body
The radius of the body
Square of the diameter of the body
Explanation:
Q.
Why gamma rays are used to kill bacteria to sterilize surgical equipment etc ?
Massless
Highly penetrating
All of above
Chargeless
Explanation:
Q.
Simple harmonic motion is a type of________________?
Musical arrangement
Vibratory motion
Rotational motion
Circular motion
Explanation:
Q.
When we excite some atoms by heat collision or electrical discharge they will________________?
absorb particular wavelengths when white light is incident on them
radiate electromagnetic energy of discrete characteristic wavelength
emit either invisible or visible light
radiate electromagnetic energy with a continuous distribution of wavelength
Explanation:
Q.
A galvanometer basically is an instrument used to ____________________?
measure potential difference between two points in a circuit
measure current flowing through a circuit
detect current in a circuit
measure voltage across a circuit
Explanation:
Q.
Errors in the transmission of power through optic fiber can be minimized by using a______________?
Multimode index fiber
Copper wire
Single mode step index fiber
Graded index fiber
Explanation:
Q.
When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?
a straight line along its initial direction
a straight line parallel to the field
a circle in a plane perpendicular to the field
a parabola in a plane perpendicular to the field
Explanation:
Q.
In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?
Inverted population
All the above
Normal state
Metal stable state
Explanation:
Q.
The mass attached to a spring executes ?
Vibratory motion
S.H.M
Rotatory motion
Both A and C
Explanation:
Q.
Select an alternative from of uncertainly principle from the following_______________?
?E = h/m?c(1-cos?)
Any of above
?E . ?t = h
mc2 = hv
Explanation:
Q.
Which of the following is path funtion?
work and heat
Entropy
Enthalpy
Internal energy
Explanation:
Q.
What is the force of attraction between any two bodies by virtue of their masses is called?
Electromagnetic Force
Nuclear Force
Centripetal Force
Gravitational Force
Explanation:
Q.
The drag force is given by_________________?
Newtons law
Gauss law
Stokes law
Pascals law
Explanation:
Q.
Reverse process of photoelectric effect is_______________?
annihilation of matter
pair production
Compton effect
X-rays production
Explanation:
Q.
A voltage V = V0 cos ?t is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?
V?/?2R
V02/?2R
V/?2?R
2/?2?R
Explanation:
Q.
The magnetic field strength of solenoid is__________________?
B = ?nI
B = ?N/I
B = ?NI
Both B and C
Explanation:
Q.
A mass spectrograph (spectrometer) sorts out____________?
Molecules
Ions
Elements
Isotopes
Explanation:
Q.
If the volume of a gas is held constant and we increase its temperature then_______________?
its pressure is constant
its pressure falls
any of above
its pressure rises
Explanation:
Q.
The restoring force acting on the simple pendulum is given by_______________?
mg sin ?
mg sin ?
mg cos ?
mg cos ?
Explanation:
Q.
The angular speed of seconds hand of a watch in rads-1 is______________?
?
?/2
?/30
?/180
Explanation:
Q.
Which one is venturi relation ?
A1 V1 = A2 V2 = constant
P1
V2 = 2g (h1-h2)
P = 1 /2?V2 = ?gh = constant
Explanation:
Q.
An ammeter measures the total current flowing through a circuit when it is connected__________________?
in series with the circuit
in parallel with circuit
in parallel with any of the series resistances in the circuit
in series with any of the parallel resistances in the circuit
Explanation:
Q.
A Stone thrown from the top of a tall building follows a path that is:
Parabolic
Made of two straight line segments
Circular
Hyperbolic
Explanation:
Q.
Depletion region of a junction is formed_____________?
under reverse bias
when temperature varies
during the manufacturing process
under forward bias
Explanation:
Q.
Angle between the rectangular components of a vector is________?
30
Zero
45
90
Explanation:
Q.
The centripetal acceleration produced in a rotating body is commonly due to change on_________of body?
None of these
both
magnitude
direction
Explanation:
Q.
Which one is not correct for a vector A= 2i+2j+3k ?
Has magnitude 2
Has magnitude -2
Has magnitude 2 and direction
Has direction 45
Explanation:
Q.
The frequency of a circuit consisting of a capacitance C and a resistor R is________________?
1/ 2RC
R/C
C/R
1/RC
Explanation:
Q.
Frequency is the inverse of __________?
Stress
Gravity
Time Period
Velocity
Explanation:
Q.
Alpha particle ionizes an atom_________________?
Through direct collision
Through electrostatic repulsion
Through electrostatic attraction
All of above
Explanation:
Q.
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?
aperture
center of curvature
optical center
focus
Explanation:
Q.
Mass defect per nucleon is ___________________?
Packing fraction
All of above are one and the same thing
The binding energy of the nucleus
The average energy of the nucleus
Explanation:
Q.
One AMU is equal to__________________?
166 x 10-15ng
1.66 x 10-27kg
166 x 10-20g
All of above
Explanation:
Q.
Cos?i^ + Sin?j^ is a_________________?
Vector in the direction at angle ? with an x-axis
Position Vector
Vector
The unit vector in the direction at angle ? with an x-axis
Explanation:
Q.
In damped harmonic oscillation which one decreases ?
Amplitude of vibration
Neither amplitude nor energy
Energy of vibration
Both amplitude and energy
Explanation:
Q.
The scales of temperature are based on two fixed points which are_________________?
The temperatures of ice cold and boiling water
The temperature of melting ice and boiling water at atmospheric pressure
The temperatures of water at 0? 100?C
The temperatures of frozen and boiling mercury
Explanation:
Q.
The pressure exerted by a column of mercury 76cm high and at 0
1 Pascal
1 atmosphere
data is insufficient
1 Newton per square meter
Explanation:
Q.
If A=B, which of the following is not correct ?
AB^ = BA^
A.B = A^ B^
|A| = |B|
|A^| = |B^|
Explanation:
Q.
Two coherent sources of light produce interference (destructive) when the phase difference between them is _________?
?/4
?
?/2
2?
Explanation:
Q.
Atom is the smallest particall which is_________?
Both
Divisible
Indivisible
Non of these
Explanation:
Q.
Mach number is used in connection with the speed of___________?
Light
aircraft
Ship
Sound
Explanation:
Q.
Electromagnetic waves transport___________________?
Energy
Heat
Mass
Momentum
Explanation:
Q.
Inertia is depends upon only?
Mass
Direction
Velocity
Time
Explanation:
Q.
The uncertainty in a measurement may occur due to_______________?
Natural variation of the object to be measured
All given in A, B and C
Inadequate technique
Limitation of an instrument
Explanation:
Q.
The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is________________?
12?
3?
?
6?
Explanation:
Q.
At resonance the value of the power factor in an L-C-R series circuit is_______________?
Not definite
1
2
Zero
Explanation:
Q.
The radiations emitted form hydrogen filled discharge tube show____________?
absorption spectrum
continuous spectrum
band spectrum
line spectrum
Explanation:
Q.
The energy of SHM is maximum at_______________?
All positions during SHM
In between mean and extreme
Mean position
Extreme position
Explanation:
Q.
A body can have constant velocity when it follows a_____________?
Circular path
Parabolic path
Rectilinear path
Elliptical path
Explanation:
Q.
When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by______________?
The tension in the string
Velocity of body
Mass of a body
Centripetal acceleration
Explanation:
Q.
The velocity of laser light is___________________?
Less than ordinary light
More than ordinary light
Different for different colours or frequency
Equal to ordinary light
Explanation:
Q.
A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?
200 mA
0.2 mA
2.0 mA
20 mA
Explanation:
Q.
A stone is thrown upward from the top of a 59.4m high cliff with an upward velocity component of 19.6m/s how long is the stone in the air?
4.00 s
7.00 s
5.00 s
6.00 s
Explanation:
Q.
What is the minimum number of unequal magnitude vectors required to get a null vector?
Two
Three
None
Zero
Explanation:
Q.
We can produce heat by________________?
Frictional process
All of the above
Electrical processes
Chemical processes
Explanation:
Q.
A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
F/0
F=1/Bsin?
F=1/B
F=1/Bcos?
Explanation:
Q.
Laminar flow usually occurs at speeds_____________?
High
Low
Some time high and some time low
Very high
Explanation:
Q.
Which one is not a branch of physical sciences ?
Chemistry
Biology
Geology
Astronomy
Explanation:
Q.
The value of critical angle for glass is_______________?
47
52
42
50
Explanation:
Q.
Electron cannot exist in the nucleus it is confirmed by observing that______________?
Its size as compare to proton and neutron is very small
The velocity of electron must be very high according to uncertainty principle
No antiparticle of electron is present
It does emit radiation
Explanation:
Q.
The maximum safe limit dose for persons working in a nuclear power station is ________________?
1 rem per week
5 rem per week
4 rem per week
3 rem per week
Explanation:
Q.
Triple point of water is_____________________?
273.16K at 750 Kpa
273.16
273
273K at 61.6 Kpa
Explanation:
Q.
In case of planets the necessary acceleration is provided by______________?
Gravitational force
Centripetal force
Frictional force
Coulomb force
Explanation:
Q.
Average distance covered by alpha particles in the air before its ionizing power ceases is called its_________________?
Range
Firing level
Limit
Trajectory
Explanation:
Q.
The speed of the fluid is maximum in the venturi meter at_______________?
Divergent duct
Throat
None of these
Convergent duct
Explanation:
Q.
Many of the semi conductors are crystals of the type__________________?
Body centred cubic
All of the above
Simple cubic
Face centred cubic
Explanation:
Q.
Which instrument is suitable to measure the internal diameter of a test tube?
Screw Gauge
None
Bore Gauge
Vernier Callipers
Explanation:
Q.
Which one is the highest power multiple ?
Beta
Deca
Mega
Giga
Explanation:
Q.
Which one is not an example of adiabatic process ?
rapid expansion of air
rapid escape of air from a burst tyre
conversion of water into ice in refrigerator
cloud formation in the atmosphere
Explanation:
Q.
A convex lens gives a virtual image only when the objects lies_________________?
beyond 2 f
between principal focus and optical center
at the principal focus
between principal focus and center of curvature
Explanation:
Q.
The magnitude of i^. (j^ x k^) is________________?
-1
1
i^
Explanation:
Q.
The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
Stephens law
Karl-Weins law
Rayleigh-Jeans law
Plancks
Explanation:
Q.
Rain drops fall from great height Which among the following statements is true regarding it?
their velocity increases and they fall with same velocity on the earth
their velocity increases and they fall with different velocity on the earth
they fall with that ultimate velocity, which are different for different droplets
they fall with same ultimate velocity
Explanation:
Q.
Wave-like characteristic of electron is demonstrated by______________?
Photoelectric effect
Diffraction by crystalline solids
Line spectrum of atoms
Production of x-rays.
Explanation:
Q.
In half-wave rectification the output D.C. voltages is obtained across the load for_______________?
The positive half cycle of A.C.
Either positive or negative half of A.C.
The negative half cycle of A.C.
The positive and negative half cycles
Explanation:
Q.
In which process entropy remains constant________________?
isothermal
isochoric
adiabatic
isobaric
Explanation:
Q.
An electromagnetic wave consists of _____________________?
Electric and magnetic fields moving parallel to each other
Electric and magnetic fields moving perpendicular to each other
Electric field moving with velocity of light
Magnetic field moving with velocity of light in space
Explanation:
Q.
Magnification of the astronomical telescope is_____________?
(1+fo/fe)L/fo
fo+fe
fe/fo
fo/fe
Explanation:
Q.
The owl can see most clearly in total darkness because:
it produces infrasonic sounds
it has squint eyes
it has light bulbs in its eyes provided by nature
it has large eyes with orbs directed forward, giving it binocular sight
Explanation:
Q.
When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
zero
greater than the restoring couple
equal to the restoring couple
smaller than the restoring couple
Explanation:
Q.
For ___________ flow the path of the fluid particles cannot be tracked?
Laminar
Both A and B
Streamline
Turbulent
Explanation:
Q.
A man standing near a fast moving train may fall___________?
On the train
On himself
Away from the train
Towards the train
Explanation:
Q.
Which one does not work according to resonance ?
Bulb
Microwave oven
Radio
T.V
Explanation:
Q.
Which one of the following radiations has the strongest photon?
T.V waves
X-rays
?-rays
Microwaves
Explanation:
Q.
The profile of aeroplane wing which lifts it up is called as_____________?
Curved profile
Aerofoil profile
Wing shape
None of these
Explanation:
Q.
If a lift is going up with acceleration, the apparent weight of a body is:
Equal to the true weight
More than the true weight
Less than the true weight
More or less the true weight
Explanation:
Q.
Which one of following postulate is in accordance with the Rutherfords model ?
either continuous nor discrete
continuous spectra for atoms
no spectrum
discrete spectra for atoms
Explanation:
Q.
Excited atoms return to their ground state in_______________?
10-8s
10-10s
10-6s
10-9s
Explanation:
Q.
A cyclist cycling around a circular racing track skids because_____________?
the centripetal force upon him is greater than limiting friction
the centripetal force upon him is equal to the limiting friction
the centripetal force upon him is less than limiting friction
the friction between the tyres of the cycle and road vanishes
Explanation:
Q.
While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
a most sensitive galvanometer is used
a high resistance box is used in one of its gap
the balance point is close to the middle of the wire
a steady voltage cell is used
Explanation:
Q.
The system which can exchange matter as well as energy with its surroundings is called____________?
Isolated system
Closed system
open system
Inert system
Explanation:
Q.
Minimum number of communication satellites required to cover the whole earth is______________?
3
5
2
4
Explanation:
Q.
The unit of power is _________?
Pascal
watt
Newton
Joule
Explanation:
Q.
Total number of series in hydrogen spectrum is_____________?
four
three
five
six
Explanation:
Q.
Materials that undergo plastic deformation before breaking are called __________________?
Polymers
Amorphous
Brittle
Ductile
Explanation:
Q.
The distance between any two consecutive nodes or antinodes in a stationary wavelength (?) is _________?
?
?/4
?/2
?/8
Explanation:
Q.
The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
180
90
Zero
45
Explanation:
Q.
According to which one of following law the density of atom is uniform ?
Bohrs model
J.J.Thomson model
Rutherfords model
All of the above laws contradict the statement
Explanation:
Q.
Standard condition STP refer to a gas at ___________________?
760mm 273K
1atm 273K
76cm 0
all of the above
Explanation:
Q.
Name the SI unit having the symbol cd?
Ampere
Candela
Cm
Second
Explanation:
Q.
Kirchhoff
junction voltages
both
IR Drops
Battery emf
Explanation:
Q.
I ^. (j^ x k^) is equal to______________?
i^
1
k^
j^
Explanation:
Q.
If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?
At the lowest point
At any point during motion
At the point where gravity is not acting
At the highest point
Explanation:
Q.
A convex lens acts as a diverging lens if the_________________?
if the object is with in C
both B and C
object is beyond C
if the object is within f
Explanation:
Q.
In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?
The capillary tube is very narrow
The amount of mercury use is very small
The capillary tube has a small constriction near the bulb
Mercury takes a long time to contract
Explanation:
Q.
In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?
300km
100km
20km
200km
Explanation:
Q.
Random errors can be reduced by_______________?
Comparing the instrument with another more accurate one
Taking mean of several measurements
All methods explained in A, B and C
Taking zero correction
Explanation:
Q.
Which of the following is used to control rods in nuclear fission?
All of these
Cadmium
Heavy Water
Graphite
Explanation:
Q.
If n number of the photon is striking on a metal surface then total momentum exerted is_______________?
p
None
n
Explanation:
Q.
If the wavelength of incident radiation is increased in photoemission then_________________?
The minimum kinetic energy of the photoelectrons increases
The average kinetic energy of the photoelectrons decreases
The maximum kinetic energy of the photoelectrons increases
The minimum kinetic energy of the photoelectrons decreases
Explanation:
Q.
The metastable state for an atom in laser light is_____________?
10-3 sec
10-5 sec
10-4 sec
10-8 sec
Explanation:
Q.
Unit of power of a lens is________________?
meter
diopter
watt
horsepower
Explanation:
Q.
In n-p-n transistor, p works as______________?
base
emitter
any of above
collector
Explanation:
Q.
A three-dimensional image is obtained by________________?
None of the above
Electron microscope
Scanning electron microscope
Magnetic imaging
Explanation:
Q.
If an object is placed away from 2f of a converging lens then the image will be_______________?
real and erect
real and inverted
virtual and erect
virtual
Explanation:
Q.
In an angular motion, Newton
?? = I ?
All above
F=?p/It
F=ma
Explanation:
Q.
The charge on neutron is_______________?
Plus 1.6 x 10-19C
Zero
Minus 1.6 x 10-19C
No definite charge
Explanation:
Q.
Neutron was discovered by: _________?
Neil Bohr
Rutherford
Chadwick
Einstein
Explanation:
Q.
Medium which sends signal from source to destination is known as ________ ?
Hardware
Transmitter
Transmission channel
Receiver
Explanation:
Q.
Mark the wrong statement ?
an un-accelerated frame of reference is called an inertial frame of reference
a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
all the frames of reference in uniform rectilinear motion are equivalent
Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
Explanation:
Q.
The light used in optical fiber transmission is________?
None of these
Dichromatic
Pentachromatic
Monochromatic
Explanation:
Q.
The number of categories in which physical quantities are divided is_____________?
2
3
4
1
Explanation:
Q.
Product of wavelength and time period is _______________?
Frequency
Time period
Wavelength
Velocity
Explanation:
Q.
Which one of the following has the largest energy content ?
102 photons of wavelength 1nm (x-rays)
103 photons of wavelength 2 pm (?-rays)
106 photons of wavelength 200nm (UV)
106 photons of wavelength 50?m (infrared)
Explanation:
Q.
Forced vibration is known as_____________________?
Natural vibration
Simple harmonic vibration
Free vibration
Driven harmonic vibration
Explanation:
Q.
The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?
Sinusoidal current
Average current
r.m.s current
Net current
Explanation:
Q.
The efficiency of the Carnot engine working between 150
29.4%
100%
23.6%
50%
Explanation:
Q.
Total distance travelled by a bob of the simple pendulum in one vibration is equal to________________?
Square of the amplitude
2 x amplitude
4 x amplitude
Amplitude
Explanation:
Q.
A 100
62?
32?
100?
50?
Explanation:
Q.
Two parallel wires carrying currents in the opposite directions____________________?
have no effect upon each other
attract each other
repel each other
they cancel out their individual magnetic fields
Explanation:
Q.
An inductor may store energy in ________________?
Its electric field
Both electric and magnetic fields
Its coils
Its magnetic field
Explanation:
Q.
Which one of the following has the highest value of specific heat?
Methane
Kerosene
Alcohol
Water
Explanation:
Q.
The core of a transformer is laminated to reduce energy losses due to__________?
None of these
Hysteresis
Eddy currents
Resistance in winding
Explanation:
Q.
During an encounter with an atom alpha particle knocks out ______________?
Electrons
Nothing
Neutrons
Protons
Explanation:
Q.
To find the r.m.s value of an alternating current mathematically we need to have ________________?
Square root of mean value of I2
Square root of I2
Square of 1/2
Mean value of I2
Explanation:
Q.
The ratio of displacement to distance can not be___________?
All are possible
Less than one
Equal to one
Greater than one
Explanation:
Q.
The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________?
Solar cells.
The switch
The photo diodes
The light emitting diode
Explanation:
Q.
Which of the following can not be the resultant of two vectors having magnitude 10N and 15N?
30N
18N
22N
25N
Explanation:
Q.
The acceleration of a projection on the diameter for a particle moving along a circle is_______________?
wx2
w2x
wx2
w2x
Explanation:
Q.
n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
V2 = VR2+VL2+VC2
V2 = VL2+(VR-VC)2
V2 = VR2+(VL-VC)2
Explanation:
Q.
An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is________________?
a foolish question
less than one meter
one meter
greater than one meter
Explanation:
Q.
Which of the following is reverse process of composition of vectors?
Addition of vectors
Multiplication of vectors
Subtraction of vectors
Resolution of vectors
Explanation:
Q.
Ratio of the weight of H-atom to that of an electron is approximately______________?
18360
18.336
183.6
1836
Explanation:
Q.
A satellite moving around the earth constitutes______________?
Non-inertial frame
An inertial frame of reference
Neither inertial nor non-inertial
Both inertial and non-inertial
Explanation:
Q.
The symbol of the prefix used for Mega is_______?
h
M
E
G
Explanation:
Q.
The relativistic energy E is equivalent to relativistic mass given by_______________?
E/c
c2/E
Ec2
E/c2
Explanation:
Q.
The period of a circular motion is given by_______________?
T = 2?r/v
T = 2?r
T = ?v
T = ?w
Explanation:
Q.
The unit of force is _________ and its symbol is ______________ Which is the correct pair ?
newton, N
Newton, n
Newton, N
newton, n
Explanation:
Q.
The size of one degree of Celsius is equal to_________________?
3.2 degrees of Fahrenheit scale
One degree of Fahrenheit scale
1.8 degrees of Fahrenheit scale
2.12 degrees of Fahrenheit scale
Explanation:
Q.
1024 can be written in scientific notation as______________?
0.000976
1.024
1/0.00097
2 Raised to power 10
Explanation:
Q.
The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?
Ke2/rn
Ke2/rn2
Explanation:
Q.
A___________has no size or shape, just position.
vertex
point
bottom
line
Explanation:
Q.
During the fission process a large amount of______________?
Light energy is released
Nuclear energy is released
Heat energy is released
Chemical energy is released
Explanation:
Q.
Centripetal force performs_______________?
Minimum work
Maximum work
Negative work
No work
Explanation:
Q.
Which branch of science plays an important role in the development of technology and engineering ?
Physics
Geology
Chemistry
Biology
Explanation:
Q.
Temperature is a property which determines_________________?
How much total absolute energy a body has
Whether a body will feel hot or cold to touch
How much heat a body contains
In which direction heat will flow between two systems
Explanation:
Q.
A vector can have maximum________components in a plane.?
Three
Zero
Two
Infinite
Explanation:
Q.
Which one of the following is not an electromechanical instrument ?
AC transformer and DC generator
ammeter
galvanometer
voltmeter
Explanation:
Q.
In fission process_______.
both A & B
massive nucleus splits to form smaller fragments
massive nucleus join together
None of these
Explanation:
Q.
A low resistance which can bypass a current is: _____________?
Multiplier
Shunt
Divider
None of these
Explanation:
Q.
1atm is equal to
101.3 kPa
all of the above
760 torr
760 mmHg
Explanation:
Q.
In vibratory motion_________________?
K E remain constant
total energy remains constant
total momentum remains constant
P E remains constant
Explanation:
Q.
Potential energy means?
Due to gravity
Due to motion of object
Due to position of object
None of these
Explanation:
Q.
Smaller the least count of the instrument more is the measurement________________?
Precise
None of these
Accurate and precise
Accurate
Explanation:
Q.
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?
5
2
0.2
0.5
Explanation:
Q.
For normal adjustment, length of astronomical telescope is______________?
fe / fo
fo / fe
fo
fo + fe
Explanation:
Q.
In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?
Remains same
Becomes half
Becomes double
First increases then decrease because of the curvilinear graph
Explanation:
Q.
A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?
f1f2/f1-f2
f1f2/f2+f1
f2 + f1
f2
Explanation:
Q.
The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12?. Galvanometer resistance is_____________?
18?
30?
24?
12?
Explanation:
Q.
The rotational K.E of the hoop is equal to the______________?
its translational K.E
four times than its translational K.E
half than its translational K.E
double than its translational K.E
Explanation:
Q.
The time period of a second pendulum is______________?
2 seconds
3 seconds
4 seconds
6 seconds
Explanation:
Q.
Heating a magnet will ____________________?
demagnetize it completely
weaken it
reverse its polarity
strengthen it
Explanation:
Q.
According to Pascals law the pressure of gas in a vessel is_____________?
Same only along normal directions
Same in all direction
Different in different direction
Same only along opposite directions
Explanation:
Q.
The charge on alpha particles is________________?
Minus two
Minus one
Plus one
Plus two
Explanation:
Q.
Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
Stiffness
Extension
Deformation
Toughness
Explanation:
Q.
Bernoulli
Mass
Momentum
Energy
Fluid
Explanation:
Q.
We prefer mercury as a thermometric substance because______________?
It opaque to light
All of above
Over a wide range of temperature its expansion is uniform
It does not stick to thermometer glass
Explanation:
Q.
The number of significant figures in 5.400 is________________?
5
3
None
2
Explanation:
Q.
A vector can have maximum________components in space.?
Infinite
Three
Zero
Two
Explanation:
Q.
A ball is thrown towards the earth and bounce back. During this process:
Direction of Displacement and acceleration changes
Direction of Displacement and Velocity changes
Direction of Displacement, Velocity and acceleration changes
Direction of velocity and acceleration changes
Explanation:
Q.
Photon of highest frequency will be absorbed when transition takes place from_____________?
1st to 5th orbit
3rd to 5th orbit
4th to 5th orbit
2nd to 5th orbit
Explanation:
Q.
The speed of light will be minimum while passing through ?
Water
Vaccum
Air
Glass
Explanation:
Q.
What is unit of conductivity?
Watt
Ohm
None of these
mho
Explanation:
Q.
Transuranic elements have an atomic number_______________?
Greater than 72
Greater than 82
Greater than 92
Greater than 102
Explanation:
Q.
Ammeter connected in an AC circuit measures______________?
RMS value of the current
The exact value of the current
The net value of the current
The peak value of the current
Explanation:
Q.
In a multi range ammeter as the range increases _____________________?
shunt value decreases
none of the above
shunt value remains the same
shunt value increases
Explanation:
Q.
A black body emitting all the radiation in the visible region appears________.
Blue
White
Green
Black
Explanation:
Q.
Addition of vectors obeys_______law?
Associative Law
Commutative Law
All of these
Distributive Law
Explanation:
Q.
Two fog droplets have radius 2:3 their terminal velocities are_______________?
4:06
4.3
2:09
4:09
Explanation:
Q.
The function of collimeter in spectrometer is________________?
to produce parallel beams of light
to make them
no function
to filter the light rays
Explanation:
Q.
Stokes law is applicable if body has __________shape?
Circular
Rough
Square
Spherical
Explanation:
Q.
The penetration power of alpha particle as compared to beta particle is_______________?
10 times less
100 times more
10 times more
100 times less
Explanation:
Q.
With the increase of pressure, the boiling point of any substance:
Remains same
Decreases
Becomes Zero
Increases
Explanation:
Q.
A force On particle is conservative if:________?
It
It
It
It work depends on the end points of every motion, not on the path between
Explanation:
Q.
If a vector ? is making an angle
None
Ay= ACos?
Ay= ASin?
Ax= ACos?
Explanation:
Q.
Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
magnetic field intensity
self inductance
magnetic induction
magnetic flux
Explanation:
Q.
Compton
Marley
Stefan Boltzman
Arthur Holly Compton
Mosely
Explanation:
Q.
The co efficient of linear expansion is equal to__________?
L?T/?L
?L = ?L?T
?L?T-?L
?L/L?T
Explanation:
Q.
The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?
60
45
30
180
Explanation:
Q.
An alternating current or voltage_____________________?
changes its direction again and again
varies in magnitude alone
changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals
fluctuates off and on
Explanation:
Q.
In multimode step index fibre the refractive index of core and cladding is____________?
different with refractive index of core higher than cladding
same
different
zero
Explanation:
Q.
Beta particles ionize an atom_________________?
Due to a direct collision
Due to the electrostatic force of attraction
Due to the gravitational force
Due to the electrostatic force of repulsion
Explanation:
Q.
The dimension of torque is______________?
[ML-2T-2]
[ML2T]
[MLT-2]
[ML2T-2]
Explanation:
Q.
If a wheel of radius r turns through an angle of 30
V/30 x r
? /3 x r
?/6 x r
? / 180 x r
Explanation:
Q.
Linear momentum of a photon is_______________?
hv/c2
c2/hv
hv/c
zero