CPMT Sample Paper Physics

1. Gamma rays are
(a) Streams of protons
(b) Streams of electrons
(c) Electromagnetic waves of long wavelengths
(d) Electromagnetic waves of short wavelengths

2. Two thin lenses whose powers are +2D and -4D respectively.
The power of the combination is
(a) -2D (b) -4D (c) +4D (d) +2D

3. If the diameter of closed tube is D, the value of end correction
is
(a) 0.15D (b) 0.6D (c) 1.2 D (d) 0.3D

4. A resistor R1, dissipates the power p when connected to a
certain generator. If a resistance R2 is put in series with R1, the
power dissipated by R1
(a) increases (b) decreases
(c) may increase or decrease (d) remains the same

5. The work done in adiabatic change in a gas depends on
(a) Change in pressure (b) Change in volume
(c) Change in temperature (d) None

6. The isothermal bulk modulus of a perfect gas at atmospheric
pressure is
(a) 1.03×105 N/m2 (b) 1.03×106 N/m2
(c) 1.03×1010 N/m2 (d) 1.03×1111 N/m2

7. The quality of a tone:
(a) decreases with loudness
(b) varies directly as pitch
(c) depend upon the overtones present
(d) varies inversely as the amplitude

8. Ω-m is the unit of
(a) Resistance (b) Resistivity (c) Conductivity (d) Conductance

9. Number of electrons passing through a conductor per second to
constitute a current of 1 micro ampere is
(a) 6.25 × 1018 (b) 6.25 × 1015
(c) 6.25 × 1012 (d) 1.6 × 10-19

10. The electric potential at any point inside a charged hollow
sphere
(a) is the same
(b) is zero
(c) increases with distance from the centre
(d) decreases as the distance from the centre increases

11. A body of mass 2kg is moving along a horizontal surface. A
force of 4N is needed to make it move with constant velocity
10 m/s along a straight line. If 4N force is suddenly reserved
while the body is in motion
(a) It will come to rest with a retardation of 4 m/s2
(b) It will come to rest with a retardation of 4 m/s2 and then
move with constant velocity in the opposite direction
(c) It will not move at all
(d) It will come to rest with a retardation of 2 m/s2

12. An adiabatic process at constant
(a) Heat (b) Temperature
(c) Pressure (d) Temperature and Pressure

13. Air in a cylinder is suddenly compressed by a piston, which is
then maintained at the same position with the passage of time
(a) the pressure decreases
(b) the pressure increases
(c) the pressure remains the same
(d) the pressure may increase or decrease

14. In the above question if the volume after compression is half
the original volume, the final pressure after a long time is
(a) greater than twice the initial pressure
(b) equal to twice the initial pressure
(c) equal to the initial pressure
(d) equal to half of the initial pressure

15. Two thermometers X and Y have ice points marked at 150 and
250 and steam points marked as 750 and 1250 respectively.
When thermometer X measures the temperature of a bath as
600 on it, Y would measure the same temperature as
(a) 600 (b) 750 (c) 1000 (d) 1050

16. Dry air (γ = 1.5) at atmospheric pressure is suddenly
compressed to one fourth of its original volume. The pressure
will be
(a) 3 atmosphere (b) 6 atmosphere
(c) 8 atmosphere (d) 10 atmosphere

17. Out of the following the vector quantity is
(a) electric charge (b) current
(c) potential (d) electric field intensity

18. The number of images formed by the mirrors inclined at 450 of
an object between them is
(a) Infinite (b) Seven (c) One (d) Four

19. Two tuning forks of frequencies 252 Hz & 256 Hz sounded
together produce beats. The frequency of resultant wave is
(a) 252 Hz (b) 4 Hz (c) 254 Hz (d) 258 Hz

20. A flask containing air at 270C at atmospheric pressure is corked
up. A pressure of 2.5 atmosphere inside the flask would force
the cork out. The temperature at which it will happen is
(a) 67.50C (b) 750K (c) 5770C (d) 7500C

21. A motor car tyre is pumped to 2 atmospheres at 150C when it
bursts. Assume adiabatic expansion. The drop in temperature of
air is: (for air γ = 1.4)
(a) -560C (b) 410C (c) 560C (d) none of the above

22. If the sound in hydrogen is v, then in a mixture of hydrogen
and oxygen in the ratio 5:1 by volumes, the speed of sound at
same temperature and pressure is
(a) (6.5)½ v (b) (5/6)½ v (c) (7/3)½ v (d) (6/21)½ v

23. When a body is positively charged it means that
(a) Some protons have been added to it
(b) Some electrons have been removed from it
(c) Some protons have been removed from it
(d) Some electrons have been added to it

24. Two unequal resistors are connected in parallel in a circuit.
Then
(a) The current is the same through both of them
(b) Voltage drop is the same across them
(c) There will be larger potential drop across them
(d) Larger current flows through the larger resistance

25. When a mass is rotating in a plane about a fixed point its
angular momentum is directed along
(a) The radius
(b) The tangent to orbit
(c) Line at an angle of 450 to the plane of rotation
(d) The axis of rotation

26. Compressed air in the tube of a wheel of a cycle at a normal
temperature suddenly starts coming out from a puncture. The
air inside:
(a) starts becoming cooler
(b) may become hotter or cooler depending upon the amount of
water vapour present
(c) starts becoming hotter
(d) remains at the same temperature.

27. The refractive index is the least for
(a) Green light (b) Blue light (c) Red light (d) Yellow light

28. The pressure exerted by an ideal gas is proportional to
(a) square of the velocity of the molecules
(b) the mean velocity of the molecules
(c) the mean square velocity of the molecules
(d) the root mean square velocity of the molecules

29. A body rotating with an angular velocity 20 rad/s comes to rest
in 4 seconds. The angle turned in last second of its motion is
(a) 2.50 (b) 5 rad (c) 200 (d) 2.5 rad

30. The slopes of isothermal and adiabatic curves are related as
(a) Adiabatic curve slope = ½ × Isothermal curve slope
(b) Isothermal curve slope = Adiabatic curve slope
(c) Isothermal curve slope = γ × Adiabatic curve slope
(d) Isothermal curve slope = γ × Isothermal curve slope

31. When water is filled in an empty vessel, its frequency
(a) remains the same (b) decreases
(c) increases (d) either increases or decreases

32. Current flowing in a copper voltmeter is 0.4 A. The number of
Cu++ ions deposited at the cathode per minute is
(a) 1.5×1020 (b) 3×1020 (c) 4.5×1019 (d) 0.75×1020

33. Wavelength of electromagnetic wave of frequency 100 KHz
(a) 5×106 m (b) 3×103 m (c) 3×108 m (d) 4×106 m

34. A cable is shortened to half its length. The maximum load it can
support without exceeding its elastic limit
(a) Is trebled (b) Is doubled (c) Is halved (d) Does not change

35. A biconvex lens of glass (refractive index = 1.5) has faces of
radii 20 cm each. Its focal length in air is
(a) 30 cm (b) 20 cm (c) 21 cm (d) 3 cm

36. The moment of momentum is called
(a) Couple (b) Impulse (c) Angular momentum (d) Torque

37. Sound waves in air are:
(a) longitudinal (b) transverse
(c) longitudinal as well as transverse

38. A cell of emf 12 volt connected across a resistor R=7Ω draws a
current of 1.5A. The internal resistance of the cell is
(a) 0.5Ω (b) 1Ω (c) 1.5Ω (d) zero

39. The ratio of the rise in temperature of a gas when compared
adiabatically to that when compressed isothermally to the same
extent is
(a) Depends on the gas (b) More than 1
(c) Less than 1 (d) Equal to 1

40. The objective of a microscope forms
(a) virtual and enlarged image
(b) virtual and diminished image
(c) real and enlarged image
(d) real and diminished image

41. The moment of inertia of a body about an axis is I, and its
angular acceleration is α. Then I α is equal to
(a) Kinetic energy (b) The angular momentum
(c) The torque (d) Momentum'

42. The ratio of the magnetic induction to the magnetizing field is
called
(a) Magnetic potential (b) Hysteresis
(c) Susceptibility (d) Permeability

43. The equation for a stationary wave is given by y = cosx sint.
The wave length is (where x and y are in cm)
(a) 2π cm (b) π/2 cm (c) 4π cm (d) π cm

44. A hollow cylinder and a solid cylinder having the same mass and
same same diameter are released from rest simultaneously from
the top of an inclined plane. Which will reach the bottom first
(a) The solid cylinder
(b) The hollow cylinder
(c) Both will reach the bottom together
(d) The one having greater density

45. Static electricity can be produced by
(a) Chemical reaction (b) Friction
(c) Induction (d) Both by (b) & (c)

46. The distance between a town and a factory is 30km. A man
started to walk from the factory to the town at 6.30 am. While
a cyclist left the town for the factory at 6.40 am riding at a
speed of 18 km/hr. The man met the cyclist after walking 6 km.
The time at which they met is
(a) 7.30 am (b) 8.00 am (c) 8.10 am (d) 8.30 am

47. When the fast moving cathode ray particles are suddenly
stopped by a solid target of high melting point
(a) X- rays are produced (b) β- are produced
(c) α- are produced (d) Positive rays are produced

48. The separation between an object and screen is 120cm. You
are given a convex lens of focal length 25cm taking the
position object as origin location of lens to form a distinct
image on the screen is
(a) 30 & 90 cm (b) 40 & 80 cm
(c) 35.5 & 84.5 cm (d) 45 & 75 cm

49. A monoatomic ideal gas initially at 170C is suddenly compressed
to one eighth of its original volume. The temperature after
compression is
(a) 170C (b) 8870C (c) 1360C (d) none of the above

50. The material used for making a permanent magnet is
(a) Copper (b) Brass (c) Iron (d) Steel

Answers

1 D 11 A 21 C 31 C 41 C
2 A 12 A 22 D 32 D 42 D
3 D 13 A 23 B 33 B 43 A
4 B 14 B 24 B 34 D 44 A
5 B 15 C 25 D 35 B 45 D
6 A 16 C 26 A 36 C 46 B
7 C 17 D 27 C 37 A 47 D
8 B 18 B 28 C 38 B 48 C
9 C 19 C 29 D 39 B 49 B 10 A 20 B 30 D 40 C 50 D