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Class 11 Physics Practice Test: Gravitation - Escape Speed
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Avg score: 79% • Most missed: “A planet as a radius “R” and density “P”. The escape velocity of this planet is …”

On the surface of the Earth, the escape velocity is about 11.2 km/s, which is approximately 33 times the speed of sound (Mach 33) and several times the muzzle velocity of a rifle bullet (up to 1.7 km/s). However, at 9,000 km altitude in "space", it is slightly less than 7.1 km/s.

Class 11 Physics Practice Test: Gravitation - Escape Speed
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15 Questions

1. 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?
2. An object is projected vertically upwards with a velocity (gr) 1/2. What is the maximum height reached by the object if “R” is the radius of the earth and “g” is the acceleration due to gravity?
3. The escape velocity of an object from the surface of the planet does not depend on the mass of the object.
4. 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?
5. 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?
6. The escape velocity for an object to leave the surface of the earth does not depend on its size, shape, mass or direction of projection of the body.
7. The earth is able to retain its atmosphere because of _____
8. If the earth lost 99% of its mass, the escape velocity would _____
9. The escape velocity of the earth is “v”. If an object is thrown vertically upwards with a velocity “kv”, what is the speed of the object at infinity?
10. A particle is kept at a distance R above the earth’s surface. What is the minimum speed with which it should be projected so that it does not return?
11. The escape velocity at the event horizon of a black hole is 3×108 m/s, i.e., the velocity of light. What is the mass of the black hole if the distance from its centre to the event horizon is 18km?
12. A planet as a radius “R” and density “P”. The escape velocity of this planet is _____
13. The escape velocity of a planet depends on the radius of its orbit around the parent star.
14. 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 _____
15. A black hole is called so because it is a hypothetical object.

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