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