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Class 9 Science Practice Test: Gravitation
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Class 9 Science Practice Test: Gravitation
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20 Questions

1. The force of attraction between two unit point masses separated by a unit distance is called
2. The atmosphere is held to the Earth by
3. The acceleration due to gravity on the Earth depends upon the
4. An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F1 is the magnitude of force exerted by the Earth on the apple and F2 is the magnitude of force exerted by the apple on the Earth, then
5. In the relation F = GM mld2, the quantity G
6. When a ship floats in sea water
7. A boy is whirling a stone tied to a string in a horizontal circular path. If the string breaks, the stone
8. Two objects of different masses falling freely near the surface of the moon would
9. Law of gravitation gives the gravitational force between
10. An object is put one by one in three liquids having different densities. The object floats with \(\frac{1}{9}\), \(\frac{2}{11}\) and \(\frac{3}{7}\) parts of their volumes outside the liquid surface in liquids of densities d1, d2 and d3respectively. Which of the following statement is correct?
11. The value of quantity G in the law of gravitation
12. If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
13. 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
14. 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 box will be
15. The SI unit of pressure is
16. The value of acceleration due to gravity
17. 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
18. The weight of an object at the centre of the Earth of radius R is (NCERT Exemplar)
19. The gravitational force between two objects is F. If masses of both objects are halved without changing the distance between them, then the gravitational force would become
20. When a mango falls from a mango tree then

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