Mock Test - Gravitation

Revise Class 9 Science – Gravitation with Our MCQ Mock Test!

Do you really understand how gravity works beyond “what goes up must come down”? Test your knowledge with this MCQ-based mock test on Gravitation, designed according to the latest Class 9 Science syllabus. This test covers all key topics — Newton’s law of gravitation, universal gravitational constant, free fall, mass and weight, acceleration due to gravity, and numerical problems related to gravitational force and motion.

Each question has been carefully selected to strengthen your understanding, sharpen your problem-solving skills, and prepare you for exam-style challenges. Whether revising for school tests or preparing for board-level concepts, this mock test is your perfect revision partner.

Attempt now and master the concepts of Gravitation with confidence!

1. An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be

2 N

8 N

10 N

12 N

2. A mass weighing W can float if the upthrust U is related as

U > W

U = W

U < W

U ≥ W

3. Variation of g with distance r from the centre of earth with (r > Re) is best given as

g ∝ r

g ∝ r²

4. Acceleration due to gravity varies with

height

depth

shape of the planet

all of these

5. The atmosphere is held to the earth by

gravity

wind

clouds

earth’s magnetic field.

6. The force of attraction between two unit point masses separated by a unit distance is called

gravitational potential

acceleration due to gravity

gravitational field

universal gravitational constant.

7. Mass of a book is 500 g on surface of the earth. What will be its mass at a height equal to radius of earth?

500 g

Zero

1000 g

200 g

8. In a tank having ‘h’ height of liquid, two points at a depth from free surface have pressures P_A and P_B. When the point A is more closer to the wall than B. Then

P_A > P_B

P_A < P_B

P_A = P_B

Depends on density

9. Upthrust on a body depends on

density of the liquid

volume of the body

density of the body

both (b) and (c)

10. Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be

4 times

unchanged.

11. If upthrust U is equal to th the weight of the object in air, then the weight felt in the liquid is

2 W

12. A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be

maximum when length and breadth form the base

maximum when breadth and width form the base

maximum when width and length form the base

the same in all the above three cases.

13. A heavy cylinder of length l is slowly taken out of a dense liquid. The weight felt as it is taken out of the liquid

will remain the same

increases as it comes out

decreases as it comes out

increases till it attains the weight in air

14. The least value of apparent weight of a body in a fluid is

> 0

= 0

< 0

depends on the density of solid and fluid

15. Weight of 1 kg is

9.8 newton

1 kg-wt

both (a) and (b)

either (a) or (b)

16. An empty closed drum and a filled drum of same dimension will bring

same upthrust

same volume

both (a) and (b)

neither (a) nor (b)

17. An apple and a stone dropped from certain height accelerates

equally

differently

depending on density

depends on the position of the SUN

18. Acceleration due to gravity on the surface of the earth is the greatest

at poles

at equator

at 23.6 ° latitude

uniform at all places

19. There is no atmosphere on moon as

it is closer to the earth.

it revolves round the earth.

it gets light from the SUN.

the gases have less requirement of velocity or energy to escape from its surface.

20. Four planets A, B, C and D made up of same material have radius of , r, 2r and 4r respectively. The order of the planets in increasing order of the acceleration due to gravity (on their surface) is

A, B, C, D

B, C, D, A

A, C, B, D

D, C, B, A

21. A 60 kg man weighs W kg on the moon. W is

60 kg

10 kg

5 kg

70 kg

22. Acceleration due to gravity is

dependent on mass of the planet for points outside the planet.

dependent directly on the radius of the planets under comparison are made of same material.

inversely proportional to square of radius for all points on the surface of the planet.

All of these.

23. School bags have a broader base to reduce

pressure

weight

air resistance

normal reaction

24. An apple falls from a tree because of gravitational attraction between the earth and apple. If F₁ is the magnitude of force exerted by the earth on the apple and F₂ is the magnitude of force exerted by apple on earth, then

F₁ is very much greater than F₂

F₂ is very much greater than F₁

F₁ is only a little greater than F₂

F₁ and F₂ are equal.

25. The wrong option among the following is

gravitational force acts on the line joining the masses.

independent of the other masses.

always attractive by nature.

does not form action-reaction pair.

26. The value of quantity G in the law of gravitation

depends on mass of the earth only

depends on radius of the earth only

depends on both mass and radius of the earth

is independent of mass and radius of the earth.

27. A body at rest having uniform acceleration is

non-existing

can be realised only on the moon

any body thrown vertically up against gravity

possible only near the SUN

28. Acceleration due to gravity on the surface of the moon is th of its value on the surface of the earth as they have different

mass

density

radius

all of these

29. The weight of an object at the centre of the earth of radius R is

zero

infinite

R times the weight at the surface of the earth

1/R^2 times the weight at surface of the earth.

30. The value of g on the surface of the earth is 9.8 m/s². What will be its value on the surface of the moon?

1.57 m/s²

1.60 m/s²

1.63 m/s²

1.73 m/s²

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