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Gravitation CBSE Class 9

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Gravitation Topics

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Question 1/20

Q 1. A ball is dropped from a height of 20 m. It reached the ground in 2 seconds. What is the final velocity of the ball?

Solution

20 m/s

v = u + g t

g = 10 m/s2

v = 0 + 10 × 2

v = 20 m/s

Final velocity of the ball is 20 m/s.

Q 2. The gravitational force is inversely proportional to

Solution

The gravitational force is inversely proportional to the square of the distance between objects. 

Q 3. If the density of a substance is more than water, then it will _________ the water. 

Solution

If the density of a substance is more than water, then it will sink in the water.

Q 4. Weight of a liquid displaced by an object is equal to

Solution

Weight of a liquid displaced by an object is equal to the weight of an object and buoyant force acting on an object. 

Q 5. The weight of an object on the Moon is _________ times the weight of an object on the Earth.

Solution

The weight of an object on the Moon is 1/6 times the weight of an object on the Earth.

Wmoon =   Wearth 

Q 6. As we go above the Earth’s surface, the value of gravity ‘g’

Solution

As we go above the Earth’s surface, the value of gravity ‘g’ decreases.

Q 7. Gravitational force is always an ______ force.

Solution

Gravitational force is always an attractive force.

Q 8. If the body is thrown vertically upwards, its velocity

Solution

If the body is thrown vertically upwards, its velocity decreases and becomes zero when it reaches its maximum height.

Q 9. The SI unit of thrust is

Solution

The SI unit of thrust is Newton (N). 

Q 10. Working of the hydrometer is based on 

Solution

Working of the hydrometer is based on Archimedes’ principle. 

Q 11. The acceleration produced in a freely falling object to reach the surface of the Earth does not depend on

Solution

The acceleration produced in a freely falling object to reach the surface of the Earth does not depend on the mass of the freely falling object. 

Q 12. A substance will just float in the liquid when the density of the object is

Solution

A substance will just float in the liquid when the density of both substance and liquid are equal. 

Q 13. If the weight of an object is 20 N, then the mass of the object is

Solution

If the weight of an object is 20 N, then the mass of the object is 2 N.

W = m g

20 N = m × 10

m = 2 kg 

Q 14. The nail with __________ will be inserted easily inside the wooden plank.

Solution

The nail with smaller surface area will be inserted easily inside the wooden plank.

Q 15. The SI unit of density is 

Solution

The SI unit of density is kg/m3. 

Q 16. When an object is wholly or partially immersed in a liquid, it experiences ____ force which is equal to the weight of the liquid.

Solution

When an object is wholly or partially immersed in a liquid, it experiences upward force which is equal to the weight of the liquid.

Q 17. As the density of a liquid increases, the

Solution

As the density of the liquid increases, the buoyant force increases.

Q 18. Weight is a __________ quantity. 

Solution

Weight is a vector quantity. 

Q 19. Gravitational forces always exist as

Solution

Gravitational forces always exist as action and reaction pairs. 

Q 20. The buoyant force will decrease if 

Solution

The buoyant force will decreases if the volume of the solid object decreases and the density of the liquid decreases. 

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