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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. 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)
2. The value of acceleration due to gravity of earth at the equator is less than that of the poles due to _____
3. 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 _____
4. What is the angular velocity of parking satellites?
5. What is the total energy possessed by a satellite of mass 'm' orbiting above the earth of mass 'M' and radius 'R' at a height 'h'?
6. A satellite of mass 'm' orbits a planet 'P' in an elliptical orbit. The satellite is then transferred to another circular orbit of radius 'r' as shown in the figure. Which of the following hold true in this scenario?
7. The value of gravitational constant was first determined by _____
8. If a satellite is orbiting as close to the earth's surface as possible _____
9. What will be the value of acceleration due to gravity on the surface of the earth if the radius of the earth suddenly decreases to 60% of its present value, keeping the mass of the earth unchanged?
10. If the kinetic energy of a satellite is halved, its orbital radius becomes _____
11. Kepler's laws of planetary motion replaced circular orbits with _____
12. What apparatus did Henry Cavendish use in his experiment to determine the gravitational constant?
13. The radius of the moon is approximately 3.7 times smaller than the radius of the earth. Assuming that their densities are same, what is the escape velocity of the moon compared to earth?
14. A planet as a radius 'R' and density 'P'. The escape velocity of this planet is _____
15. The value of universal gravitational constant changes is which of the following medium?
16. The ratio of the radius of a planet A to that of a planet B is 'r'. The ratio of acceleration due to gravity on the planets is 'p'. The ratio of escape velocities of the two planets is _____
17. The time period of a satellite of earth is 90 minutes. If the separation between the earth and the satellite is quadrupled, the new time period will be _____________
18. What is the value of universal gravitational constant?
19. What material were the spheres made up of in Henry Cavendish's experiment?
20. A satellite of mass 'm' revolves around a planet at a height as shown in the figure. If 'g' is the acceleration due to gravity on the surface of the planet, what is the orbital velocity of the satellite?
21. What are the dimensions of universal gravitational constant?
22. 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?
23. In the figure shown, what is the point 'A' called?
24. Most waves used for communication purposes rely on geostationary satellites because _____
25. 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?


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