UPSC
CAPF (AC) EXAM 2016 – 2020: Physics MCQs
1. Which of the following statements is/are
correct?
1.
Gravitational waves were predicted by Albert Einstein in 1916 on the basis of
his theory of General Relativity
2.
Gravitional waves do also exist in the Newtonian theory of Gravitation
3.
Gravitational waves are to be detected by very sensitive detectors known as
interferometers
Select the correct answer using the code given below:
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
2. Let a resistor having 4 ohm resistance be
connected across the terminals of a 12 volt battery. Then the charge in coulomb
passing through the resistor per second is:
(a) 12
(b) 4
(c) 3
(d) 0.33
3. Which one of the following statements is not
correct?
(a) The earth’s magnetic field is due to the
motion of metals like Iron and nickel in the core of the earth
(b) The magnetic field lines of force are widely
separated near the poles of a magnet but these lines come closer to one another
at other places
(c) If the cross – sectional area of a magnetic
field increases but the flux remains the same, the flux density decreases
(d) When the speed of a conductor moving through
a magnetic field is increased the induced voltage increases
4. A Barometer kept in an elevator reads 760 mm
when the elevator is at rest. When the elevator moves in the upward direction
with increasing speed, the reading of the Barometer will be:
(a) 760 mm
(b) < 760 mm
(c) > 760 mm
(d) Zero
5. Which one of the following statements is
correct?
(a) Acceleration due to gravity decreases with
the increase of altitude
(b) Acceleration due to gravity increases with
the increase of depth (assuming earth to be a sphere of uniform density)
(c) Acceleration due to gravity decreases with
the increase of latitude
(d) Acceleration due to gravity is independent of
the mass of the earth
6. Which one of the following statements is not
true?
(a) The gravitational force of earth acting on a
body of mass 1 kg is 9.8 newton
(b) The force acting on an object of mass 5kg
moving with a uniform velocity of 10 m/s on a frictionless surface is Zero
(c) The SI unit of weight is kg
(d) The momentum of a man having mass
7. A piece of stone tied to a string is made to
revolve in a circular orbit of radius r with other end of the string as the
centre. If the string breaks the stone will
(a) move away from the centre
(b) move towards the centre
(c) move along a tangent
(d) Stop
8. Consider the following physical quantities:
Energy, power, pressure, impulse, temperature, gravitational potential
Which of the above is/ are the vector quantity/
quantities?
(a) Impulse only
(b) Impulse and pressure only
(c) Impulse, temperature and pressure
(d) Gravitational potential
9. Which one of the following statements is not
correct?
(a) The rate of evaporation depends on
temperature
(b) The rate of evaporation does not depend on
surface area exposed to the atmosphere but on volume of the liquid
(c) The rate of evaporation depends on humidity
of the surroundings
(d) The rate of evaporation depends on the wind
speed
10. Water at 273 K is less effective in cooling
than ice at the same temperature. It is because:
(a) water is difficult to handle
(b) Water at 273 K has less energy than ice at
the same temperature
(c) Water at 273 K has more energy than ice at
the same temperature
(d) Water is not a cooling agent
11. Presence of Ozone in the atmosphere is
important because it absorbs
(a) Ultraviolet – A and Ultraviolet B radiations
(b) Ultraviolet – B radiations only
(c) infrared B radiations only
(d) outgoing ultraviolet B radiations and
incoming ultraviolet A radiations
12. Statement I: Sound waves can travel through
vacuum
Statement II: Light is an electromagnetic wave and can travel through
vacuum
(a) Both the statements are individually true and
statement II is the correct explanation of statement I
(b) Both the statements are individually true but
statement II is not the correct explanation of statement I
(c) Statement I is true but statement II is false
(d) Statement I is false but statement II is true
13. Statement I: A compass needle placed near a
current – carrying wire will get deflected
Statement II: A current carrying wire creates magnetic field around it
(a) Both the statements are individually true and
statement II is the correct explanation of statement I
(b) Both the statements are individually true but
statement II is not the correct explanation of statement I
(c) Statement I is true but statement II is false
(d) Statement I is false but statement II is true
14. Which one of the following processes is not a
part of long wave radiation?
(a) Conduction
(b) Scattering
(c) Convection
(d) Radiation
15. The term LASER stands for
(a) Light Amplification by Stimulated Emission of
Radiation
(b) Light Amplification by Spontaneous Emission
of Radiation
(c) Light Amplification by Stimulated Emission of
Rays
(d) Light Amplification by Stimulated Energy of
Radiation
16. If the amplitude of Oscillation of a simple
pendulum is very small, then its period of oscillation
1. depends
on the length of the pendulum, L
2. depends
on the acceleration due to gravity, g
3. dpeneds
upon the mass of the bob of the pendulum, m
4. does
not depend upon the amplitude of the pendulum, A
Select the correct answer using the code given
below
(a) 1, 2 and 3
(b) 1, 2 and 4
(c) 2, 3 and 4
(d) 1 and 4 only
17. Lowering the atmospheric pressure on a liquid
(a) increases the boiling point of the liquid
(b) lowers the boiling point of the liquid
(c) does not affect the boiling point of the
liquid
(d) increases the time required for it to boil
18. Which of the following statements about
Optical microscope is/are correct?
1. Both
the eyepiece and objective of a microscope are convex lenses
2. The
magnification of a microscope increases with increase in focal length of the
objective
3. The
magnification of a microscope depends upon the length of the microscope tube
4. The
eyepiece of a microscope is a concave lens
Select the correct answer using the code given
below
(a) 1 and 3
(b) 3 only
(c) 3 and 4
(d) 1, 2 and 4
19. The optical phenomenon that is responsible
for the propagation of light signal through an optical fibre is
(a) interference
(b) scattering
(c) total internal reflection
(d) refraction
20. Which one of the following phenomena cannot
be exhibited by sound waves?
(a) Reflection
(b) Refraction
(c) Interference
(d) Polarisation
21. When a beam of white light is allowed to fall
on a prism, the maximum deviation of the emerging light occurs for
(a) red light
(b) violet light
(c) Yellow light
(d) blue light
22. Which one of the following is not a luminous
object?
(a) Sun
(b) Electric lamp
(c) Candle
(d) Moon
23. Brilliance of diamond is due to
(a) interference of light
(b) diffraction of light
(c) polarization of light
(d) total internal reflection of light
24. Which one of the following is NOT an
electromagnetic wave?
(a) Light wave
(b) Radio Wave
(c) Sound wave
(d) Micro wave
25. Which one of the following is NOT true for an
electromagnetic wave?
(a) Electromagnetic wave transports energy and
momentum
(b) Electromagnetic wave can be polarized and
reflected
(c) Electromagnetic wave is longitudinal
(d) Electromagnetic wave propagation is described
by the varying electric and magnetic fields
26. A snowboard pulled up by a tow rope travels
at the rate of 5m/s up a mountain. If 3000 watt of power is used, what force
was applied to it?
(a) 50 N
(b) 100 N
(c) 600 N
(d) 15000 N
27. When a longitudinal wave moves through a
certain medium, the quantity which is transmitted through the medium is
(a) material of the medium only
(b) energy only
(c) both material of the medium and energy
(d) none of the above
28. Which one of the following statements on
photoelectric effect is NOT correct?
(a) Albert Einstein received the nobel prize for
explaining photoelectric effect
(b) For each metal, there is a threshold
frequency V0 below which this effect is not observed
(c) At a frequency v > v0, the
kinetic energy of ejected electrons does not change on increasing the frequency
of incident light
(d) The number of electrons ejected is
proportional to the intensity of incident light
29. Latent heat corresponds to the change in heat
at constant
(a) temperature only
(b) volume only
(c) Pressure only
(d) temperature, volume and pressure
30. Which one of the following statements with
regard to Newton’s third law of motion is NOT correct?
(a) Force never occurs singly in nature
(b) When the earth pulls a stone downwards due to
gravity, the stone exerts a force on the earth
(c) There is a cause – effect relation implied in
the third law
(d) There is no cause – effect relation implied
in the third law
31. The radar used by police to check over
speeding vehiles works on the principle of
(a) Raman effects
(b) Induction effect
(c) Doppler effect
(d) Coulomb effect
32. Which one of the following statements
regarding motion is correct?
(a) All the periodic motions are necessarily
simple harmonic
(b) All the simple harmonic motions are
necessarily periodic motions
(c) There is no co –relation between the simple
harmonic motions and the periodicity of motion
(d) The relation between the simple harmonic
motion and periodic motion depends upon the mass of object undergoing the
motion
33. Which one of the following statements
regarding Fleming’s Rule is correct?
(a) Fleming’s left hand rule gives direction of
force on a current carrying conductor in a magnetic field
(b) Fleming’s right hand rule gives direction of
force on a current carrying conductor in a magnetic field
(c) Both the left hand and right hand rule can be
used for finding direction of force on a
current carrying conductor in a magnetic field
(d) Fleming’s rules has nothing to do with
magnetic field
34. Two magnetic field lines produced by the same
source
(a) never intersect
(b) can originate from same point
(c) can terminate at same point
(d) can intersect depending on situation
35. Which one of the following statements for an
object falling freely under the influence of gravity is correct?
(a) Zero acceleration always implies zero velocity
(b) Zero acceleration has no relation with the
velocity of the object
(c) Zero velocity at any instant necessarily
means Zero acceleration at that instant
(d) Acceleration is constant all throughout the
free fall