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Class 11 Physics: Gravitation
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MCQs on keplers laws, gravitation universal law, gravitational constant, acceleration due to earth gravity, gravitational potential energy, escape speed, earth satellite, orbiting satellite energy, weightlessness, geostationary and polar satellites.

Class 11 Physics: Gravitation
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25 Questions

1. The satellites orbiting the earth, eventually fall to the earth when they are left unsupervised or unattended because _____
2. The radius of Jupiter is approximately 11 times larger than the earth. Jupiter has a mass 316 times that of earth. What is the approximate escape velocity of Jupiter compared to earth?
3. What material were the spheres made up of in Henry Cavendish's experiment?
4. The acceleration due to gravity on the surface of the earth is _____
5. The gravitational potential energy of a body at a distance 'r' from the centre of the earth is V. Its weight at a distance '2r' from the centre of the earth is _____
6. The radius of orbit of a geostationary satellite is given by _____ (M = Mass of the earth; R = Radius of the earth; T = Time period of the satellite)
7. Assume that the earth is a perfect sphere but of non-uniform interior density. Then, acceleration due to gravity on the surface of the earth _____
8. Which of the following is the variation of acceleration due to gravity at a height 'h' above the earth's surface? Let 'R' be the radius of the earth and 'M1' the mass of earth.
9. An object of mass 'm' is displaced from the surface of the earth of radius 'R' as shown below. The object's weight in its new position is 50% of that when it was on the surface of the earth. What is the value of 'h' if R = 6400km?
10. A dam produces electricity from the gravitational potential energy of the water stored in it. The same dam has 50 cubic km of water stored 50 meters above the ground. What is the work done by gravity relative to the ground? (Assume g = 10 m/s2)
11. For which of the following does the graph denote the variation of force of gravity 'F' along a distance 'r'?
12. What is the minimum velocity required for an object of mass 'm' to escape the gravitational pull of a planet of mass 'M' and radius 'R' from its surface?
13. A satellite of mass 'm' is in a circular orbit of radius 1.5R around the earth of radius R. How much energy is required to move it to an orbit of radius 2R?
14. Which scientist introduced the universal law of gravitation?
15. From Kepler's law of orbit, we can infer that the sun is located _____ of the planet's orbit.
16. Which of the following is the variation of acceleration due to gravity at a height 'h' above the earth's surface? Let 'R' be the radius of the earth and 'M1' the mass of earth. (Assume h < < R)
17. What apparatus did Henry Cavendish use in his experiment to determine the gravitational constant?
18. How do astronauts define 'up' or 'down' in space?
19. In the figure shown, what is the point 'A' called?
20. Conventionally, the magnitude of gravitational potential energy for an object at infinity from the earth is _____ ((M = Mass of the earth; m = Mass of the object at infinity; R = Radius of the earth).
21. Consider a ring of mass 'M' as shown below. What is the gravitational potential at a point 'p' at a distance of 'r' from the centre of the ring?

22. For which of the following does the graph denote the variation of force of gravity 'F' along a distance 'r'?

23. If the earth lost 99% of its mass, the escape velocity would _____
24. The orbital velocity of a satellite orbiting the earth is half the escape velocity of the earth. What is the height above the surface of the earth at which it is orbiting? (Let the radius of the earth (R) = 6400 km).
25. Gravitational force is _____

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