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