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Class 9 Science Chapter 10 Gravitation Quiz 7 (25 MCQs)

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1. An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F$_{1}$ is the magnitude of force exerted by the Earth on the apple and F$_{2}$ is the magnitude of force exerted by the apple on the Earth, then
2. A stone dropped from the roof of a building takes 4s to reach the ground. The height of the building is:
3. How does force of gravitation act when masses of two objects are doubled
4. Which of the following has no unit?
5. What is inverse square law?
6. The weight of any person on the moon is about 1/6 times that on the earth. He can lift a mass of 12 kg on the earth. What will be the maximum mass, which can be lifted by the same force applied by the person on the moon?
7. What is 'g' of earth
8. What is the force of attraction between two objects with masses $m_1$ $m_2$ $r$
9. 5) Choose the correct unit for the relative density among the following:
10. Which of the following statements is/are correct? 1. Mass of an object is the measure of its inertia. 2. Heavier the object smaller is the inertia. 3. The mass of an object is variable. (a) Only 1 (b) 1 and 3 (c) 2 and 3 (d) 1 and 2
11. The weight of a person on the moon is about 1/6 times that on the earth.He can lift a mass of 15kg on the earth. What will be the maximum mass which can be lifted by the same force applied by the person on the moon?
12. The masses of two planets are in the ratio 1:2. Their radii are in the ratio 1:2. The acceleration due to gravity on the planets are in the ratio
13. The gravitational force between two objects does not depend on:
14. Force of gravity is inversely proportional to
15. 10) What is buoyant force?
16. The square of period of revolution around the Sun is ..... to the cube of mean distance of a planet from the Sun
17. Every object in the universe attracts everyother object with a force which is proportionalto the product of their ..... and inverselyproportional to the .....
18. Constant of proportionality is
19. A falling stone also attracts the earth. True of False
20. The motion of the moon around the the earth is due to which force?
21. On doing down deep into the earth the acceleration due to gravity
22. A ball is thrown vertically upward returns to the thrower after 6 sec. Then the velocity with which it was thrown
23. G stands for:g means
24. The universal law of gravitation was posted by:Universal rules of gravity were given:
25. 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
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