Chapter no.

6 Gravitation
Instructor=Sir Jacky Sharma

Pareesa
6/12/2021

Class 11 Physics MCQS

(1) If the mass of each body is doubled. The gravitational force is increased
(a) Two x
(b) Four x
(c) Eight x
(d) N.o.t
(2) If mass of body is doubled and the other body is halved, the gravitational force
(a) Increases

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 (b) Decreases
(c) Remains same
(d) Becomes zero
(3) If the distance between two mass is halved, the gravitational force
(a) Decreases 2 x
(b) Increases 2 x
(c) Decreases 4 x
(d) Increases 4 x
(4) The sun exerts force of attraction on the planets thus keeping them in their
(a) Axis
(b) Radii
(c) Orbit
(d) State of motion
(5) Numerical value of G can be determined by knowing
(a) Mass of earth only
(b) Mass and radius of earth only
(c) Circular motion only
(d) Orbital motion
(6) If we go away from the surface of earth a distance equal to radius of earth, the value of "g"
will become
(a) One fourth
(b) One eight
(c) One ninth
(d) Half
(7) If we go away from the surface of earth a distance equal to twice the r hmmadius of earth,
the value of "g" will become
(a) One fourth
(b) One eight
(c) One ninth
(d) Half
(8) If the mass of the earth increases 4 x,then the value of g on its surface will become
(a) Two x
(b) Four x
(c) Eight x

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 (d) Half
(9) The weight of a body changes at different places due to the change in
(a) g
(b) Mass
(c) Height
(d) Place
(10) The true weight of an object is 98 Newton. What will be its weight in an elevator if it is
ascending at the rate of 1 metre per second square
(a) 108 Newton
(b) 88 Newton
(c) 196 Newton
(d) 0
(11) The true weight of an object is 98 Newton. What will be its weight in an elevator if it is
descending at a rate of 1 metre per second square
(a) 109 Newton
(b) 88 Newton
(c) 196
(d) 0
(12) what will be the weight of an object in an elevator which descends at the rate of 99.8 metre
per second square
(a) 108 Newton
(b) 88 Newton
(c) 9.8 Newton
(d) zero
(13) An elevator is moving upward with certain acceleration. The apparent weight of a person
in it
(a) increases
(b) decreases
(c) remains same
(d) zero number
(14) An elevator is moving downwards with certain acceleration. The apparent weight of a
person in it is
(a) Increases
(b) Decreases

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 (c) Remains same
(d) 0
(15) An elevator is moving down with an acceleration greater than g. The apparent weight of
the person in it is
(a) zero
(b) Same
(c) Positive
(d) Negative
(16) If the elevator is moving up with the acceleration 2g. The apparent weight of a person in
it is
(a) Equal to true weight
(b) Two times the true weight
(c) Three times the true weight
(d) 4 times the true weight
(17) If the mass of earth becomes four times as large as the value of g will
(a) becomes 4 times
(b) become double
(c) become 16 time
(d) remain unchanged
(18) A mass weight 600 Newton on the earth. Its weight on the moon is
(a) 100 Newton
(b) 600 Newton
(c) 3600 N
(d) 300 N
(19) If the Earth was a perfect uniform sphere, the experimental value of g would be
(a) constant everywhere
(b) least at poles
(c) least at the equator
(d) none of them
(20) The gravitational force between two bodies is
(a) impulsive force
(b) frictional force
(c) action and reaction force
(d) none of them

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(21) The mass of earth is found by the relation
(a) 3/4πRe³
(b) 4/3πRe³
(c) 4πRe³
(d) 3πRe³
(22) The weight of the body, in comparison to the pole of earth at the equator is
(a) greater
(b) smaller
(c) same
(d) none of them
(23) The mass of the earth is
(a) 6x10²⁴ kg
(b) 6x10²⁴ gm
(c) 6x10²⁴ mgm
(d) 6x10²⁴ micro gm
(24) Mass of earth divided by its volume gives
(a) torque
(b) radius
(c) velocity
(d) density
(25) The mean density of earth is
(a) 5.5 x 10³ kgm-³
(b) 2.5 x 10³ kgm-³
(c) 3.5 x 10³ kgm-³
(d) 4.5 x 10³ kgm-³
(26) In comparison to water, the density of earth is
(a) 2.5 x greater
(b) 3.5 x greater
(c) 4.5 x greater
(d) 5.5 x greater
(27) The expression of g on the surface of earth is
(a) g=(GMe)/Re
(b) g=(GM²e)/Re
(c) g=(GMe)/Re²

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 (d) None of them
(28) Acceleration due to gravity does not depend upon
(a) density
(b) volume
(c) mass
(d) all of them
(29) "g" is inversely proportional to the the ______ of the distance between from centre of
earth
(a) square
(b) cube
(c) half
(d) one fourth
(30) Volume of earth is
(a) 3/4πRe³
(b) 4/3πRe³
(c) 4πRe³
(d) 3πRe³
(31) The value of g at the hill, in comparison to sea level is
(a) lesser
(b) greater
(c) equal
(d) sometimes lesser and sometimes greater
(32) At the height "h" above the surface of earth
(a) gh=(g-2hg)/Re²
(b) gh=(g+2hg)/Re²
(c) gh=(g-2hg)/Re
(d) gh=(g+2hg)/Re²
(33) the value of g is maximum
(a) above the surface of earth
(b) below the surface of earth
(c) at the surface of earth
(d) at the centre of earth
(34) At the depth d below that surface of Earth
(a) gh=(g-gd)/Re²

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 (b) gh=(g+gd)/Re²
(c) gh=(g-gd)/Re
(35) At the depth 0.5 x Re from the surface of earth g is
(a) g
(b) 0.75 g
(c) 0.5 g
(d) 0.25 g
(36) At a height three times radius of Earth from surface of earth g decreases
(a) 3x
(b) 9x
(c) 16 x
(d) totally
(37) At the centre of earth g is
(a) positive
(b) negative
(c) 0
(d) none of them
(38) The weight of a body will be zero if we could create a situation such as
(a) a + b = 0
(b) a - b = 0
(c) a = g
(d) all of them
(39) Freely falling bodies are in a state of
(a) rest
(b) static equilibrium
(c) dynamic equilibrium
(d) weightlessness
(40) A boy standing in a lift elevator falling under gravity releases a ball from his hand as
seen by him the the ball
(a) falls down
(b) remain stationary
(c) Goes up
(d) none of them
(41) The fictitious force equal in magnitude to the centripetal force is called

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 (a) impulsive force
(b) frictional force
(c) gravitational forces
(d) centrifugal force
(42) g decreases with depth because
(a) atmospheric pressure is high
(b) surrounding walls pull the body sideway
(c) rotation of earth becomes g
(d) effective mass of earth decreases
(43) mass of Earth is about to
(a) 2x10²⁴ kg
(b) 2x10²⁴gm
(c) 2x10³⁰ kg
(d) 2x10³⁰ gm
(44) State of weightlessness can be achieved by
(a) uniform motion of frame of reference
(b) accelerated motion of frame of reference
(c) keeping the frame of reference adjust
(d) free for motion at frame of reference
(45) The apparent weight of a body orbiting the earth is
(a) increased
(b) decreased
(c) mg
(d) 0
(46) If an elevator moves upward with a constant velocity the apparent weight of a body in it
will be
(a) mg
(b) more than mg
(c) Less than mg
(d) zero
(47) If an elevator moves downward with constant velocity the apparent weight of the body in
it will be
(a) mg
(b) more than mg

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 (c) less than mg
(d) 0
(48) Artificial gravity is created in the spacecraft
(a) to increase the weight of astronaut
(b) to decrease the weight of astronaut
(c) To overcome state of weightlessness
(d) to overcome force of friction
(49) Mass of planet jupiter is
(a) 1.9 x 10²⁷kg
(b) 2.9 x 10²⁷kg
(c) 3.9 x 10²⁷kg
(d) 29 x 10²⁷kg
(50) Average distance between jupiter and 🌞 is
(a) 7.8 x 10¹¹ m
(b) 7.8 x 10¹¹ mm
(c) 7.8 x 10¹² cm
(d) 6.8 x 10¹¹ m

Key
1. B.
2. C
3. D
4. C
5. B
6. A
7. C
8. B
9. A
10. A
11. B
12. D
13. A
14. B

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15. D
16. C
17. A
18. A
19. C
20. C
21. B
22. B
23. A
24. D
25. A
26. D
27. C
28. D
29. A
30. B
31. A
32. C
33. C
34. A
35. C
36. C
37. C
38. D
39. D
40. B
41. D
42. D
43. C
44. D
45. D
46. A
47. A
48. C

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49. A
50. A

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