1000+ General Physics MCQ for CLAT PG [Solved]

1. While crossing a suspension bridge, the soldiers are ordered to break steps because
A. the marching in steps will involve a big strain on them
B. the resonant vibrations caused by their marching can damage the bridge increasing the amplitude to dangerous proportions
C. the marching may obstruct other traffic
D. rumblings of their marching may disturb the surroundings
Answer : B

2. When the velocity of a body is halved
A. its momentum is halved
B. its kinetic energy is halved
C. its acceleration is halved
D. its potential energy is halved
Answer : A

3. A device used to measure heights above sea level is known as
A. altimeter
B. anemometer
C. dilatometer
D. potentiometer
Answer : A

4. Galaxies emit
A. radio waves and X-rays
B. ultraviolet light waves
C. visible light waves
D. All the above
Answer : D

5. When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light ray diminishes alter a few reflections. This is because of
A. poor reflection from the mirrors
B. scattering of light from the mirrors
C. absorption of some light by the mirrors
D. absorption of light by the atmosphere
Answer : C

6. Which mirror is used as a rear view mirror in Vehicles?
A. Parabolic
B. Convex
C. Concave
D. Plain
Answer : B

7. If an object is placed between two parallel plane mirrors, the number of images formed will be
A. 1
B. infinite
C. 0
D. 4
Answer : B

8. The best estimates of the age of the earth comes from the studies of
A. angle of inclination of the earth
B. changes in radio-active minerals in it
C. period taken by Sun's light to reach the earth
D. artificial satellites revolving round the earth
Answer : B

9. Credit for starting Space Science Research in India goes to
A. HJ Bhabha
B. SS Bhatnagar
C. V Sarabhai
D. CV Raman
Answer : C

10. A lightning conductor installed in a building
A. does not allow the lightning to fall on the building at all
B. drives away the charged clouds
C. forces the lightning to fall on other buildings near that building
D. conducts the electric charges to the ground when lightning strikes the building
Answer : D

11. An electric kettle used for boiling hard water has a white scale deposited on its heating element. This consists or
A. sugar
B. sodium carbonate
C. common salt
D. carbonates of calcium and magnesium
Answer : D

12. In the fuse of an electrical installation blows out
A. replace the fuse by a thin wire
B. replace the fuse by a thick copper wire
C. replace the fuse by a fuse wire of proper rating
D. replace the fuse by nichrome wire
Answer : C

13. The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce heat loss by
A. convection
B. radiation
C. conduction
D. All the three
Answer : B

14. The planet that is known as earth's twin is
A. Mercury
B. Venus
C. Moon
D. Mars
Answer : B

15. The escape velocity of a satellite projected from the surface of the earth is independent of
A. the mass of earth
B. the mass of the satellite
C. the radius of the earth
D. gravitation of the earth
Answer : B

16. The speed of sound in air at 0° C is approximately
A. 4 x 108 m/s
B. 1500 m/s
C. 330 m/s
D. 500 m/s
Answer : C

17. Commonly used safety fuse wire is made of
A. Tin
B. Lead
C. Nickel
D. An alloy of tin and lead
Answer : D

18. A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be
A. a parabola
B. a horizontal straight line
C. a vertical straight line
D. a circle
Answer : A

19. Before the invention of geostationary satellites, television stations could not transmit their programmes to far off places because
A. these signals are electromagnetic in nature
B. these are not electromagnetic in nature
C. their wavelength is very large
D. they are not reflected by the ionosphere but pass through it
Answer : D

20. A timer in a race is at the finish line. He should start his stop watch
A. as soon as he hears the report of the gun
B. the moment he sees the flash
C. either (a) or (b) since that makes no difference
D. None of the above
Answer : B

21. When an incident beam of light strikes the surface of a glass slab normally, the refracted beam
A. goes straight through without bending
B. gets deviated away from the normal
C. gets bent towards the normal
D. gets reflected
Answer : C

22. The completely dark portion of a shadow of an object is known as
A. umbra
B. penumbra
C. image
D. black portion of light
Answer : A

23. The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the boning point of water at a hill top
A. is more than at sea level
B. is equal to that sea level
C. is less than at sea level
D. depends on the surrounding temperature
Answer : C

24. The study of astronomy include a
A. astrology
B. astrophysics
C. astrometry
D. Both (b) and (c) above
Answer : D

25. Photo-electric cells convert
A. electrical energy into light energy
B. light energy into electrical energy
C. light energy into heat energy
D. electrical energy into heat energy
Answer : B

26. Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are
A. �± -rays
B. �² -rays
C. �³ -rays
D. Cosmic rays
Answer : C

27. The light from the star nearest to the sun reaches the earth in
A. 8 minutes
B. 4.3 years
C. 12 seconds
D. 24 hours
Answer : B

28. A proton is
A. a quantum of light energy
B. a quantum of matter
C. a positively charged atomic particle
D. another name for positron
Answer : C

29. The rocket engine is motivated by jet propulsion which uses the famous
A. Kepler's Laws
B. Newtonian Third Law of Motion
C. Bernoulli's Principle
D. Law of Relativity
Answer : B

30. It is easier to climb down a staircase than climb up because in climbing down
A. work is done against gravity
B. the steepness of the staircase isn't felt
C. gravity assists
D. there is no friction between the legs and steps
Answer : C

31. A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is
A. a planet
B. a meteor
C. a star
D. a comet
Answer : C

32. Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
A. rough white
B. rough black
C. shining white
D. shining black
Answer : B

33. Which of the following rays has the highest penetrative power?
A. �± -rays
B. �² -rays
C. �³ -rays
D. X-rays
Answer : C

34. The brightest planet in the Solar System is
A. Jupiter
B. Mercury
C. Venus
D. Sirius
Answer : C

35. Astigmatism, a structural defect of the eye, is due to
A. the eye lens being thin
B. the eye lens being thick
C. lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus
D. the pupil being very small
Answer : C

36. The atmosphere gets heated up mainly by
A. direct sun's rays
B. radiation from earth's surface
C. radiogenic heat (resulting from radioactive decay)
D. cosmic rays coming from space
Answer : B

37. The difference between planets and stars is
A. planets do not have light of their own whereas stars shine by their own light
B. planets do not twinkle like stars
C. planets are much smaller than stars
D. All the above
Answer : D

38. The property of a fluid by which it resists relative motion within itself is known as
A. cohesive force
B. surface tension
C. diffusion
D. viscosity
Answer : D

39. The end product in the uranium disintegration series is
A. lead
B. zinc
C. carbon
D. tin
Answer : A

40. A spherical mirror is
A. a reflecting elliptical portion
B. a reflecting spherical surface
C. a parabolic reflecting surface
D. a flat reflecting surface
Answer : B

41. Mercury does not stick to glass because
A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces
C. both the cohesive and adhesive forces are equal
D. None of the above
Answer : A

42. The planet that has got a well-developed set of rings is
A. Venus
B. Saturn
C. Mercury
D. Earth
Answer : B

43. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
A. the immersed volume of the body
B. density of the liquid
C. acceleration due to the gravity at the place
D. All the above
Answer : D

44. When are temperature resistance
A. increases
B. decreases
C. remains the same
D. first increases then decreases
Answer : A

45. Mercury is used in a barometer because
A. its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
B. at the ordinary temperature its vapour pressure is small
C. it is opaque and does not wet glass
D. All the above
Answer : D

46. When a bowler spins a ball, it changes its direction in the air. This is due to
A. turbulence caused by the wind
B. buoyancy of air
C. unequal pressures acting on it
D. sudden change in the direction of the wind
Answer : C

47. Which of the following apparatus is used in the electrolysis of water?
A. Voltmeter
B. Voltameter
C. Ammeter
D. Potentiometer
Answer : B

48. The Milky Way is
A. the path of a star which is nearest to the earth
B. a galaxy which includes the sun
C. a star that is nearest to the earth
D. None of these
Answer : B

49. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
A. the pores in the pot are closed
B. rain water stops oozing out from the pores
C. the water that oozes out does not evaporate quickly because of the large percentage of moisture in the air
D. surface of the pot becomes damp
Answer : C

50. The neutron, one of the constituent particles of which the nuclei of atoms are composed was discovered by
A. Irene Curie
B. W Bothe and H Becker
C. James Chadwick
D. Jean Joliot
Answer : C