Physics Gravitation Test 2 Online MCQs

1. Escape velocity of a body when projected from the earth’s surface is 11.2 km/sec. If it is projected at an angle of 50° from the horizontal, then escape velocity is:

2. The earth rotates about the sun in an elliptical orbit as shown in figure. At which point its velocity will be maximum?

3. Height of geostationary satellite is

4. The radius of earth is about 6400 km and that of mass is about 3200 km. The mass if the earth is about 10 times of the mass. The object weighs 200 N on earth surface, then its weight on the surface of mars will be

5. The velocity with which a projectile must be fired so that it escapes earth’s gravitation does not depend on:

6. Knowing that the mass of the moon is 1/81 times that if earth and its radius is 1/4 the radius of earth. If the escape velocity at the surface of the earth is 11.2 km/sec, then the value of escape velocity at the surface of the moon is

7. If the earth were to cease rotating about its own axis. The increase in the value of g in C.G.S. system at a place of latitude of 45° will be

8. A long straight wire or radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a is

9. A satellite is launched into a circular orbit of radius R around the earth. While a second satellite launched into an orbit of radius 1.01R. The period of the second satellite is longer than the first one by approximately

10. The force of gravitation is

11. A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then

12. If the mass of moon is M/81, where M is the mass of earth, find the distance of the point from the moon, where gravitational field due to earth the moon cancel each other. Given that distance between earth and moon is 60R where R is the radius of earth

13. If a mass of a body is M on the earth surface, the mass of the same body on moon surface will be

14. The value of acceleration due to gravity, at earth surface is g. Its value at the center of the earth, which we assume as a sphere of radius R and of uniform mass density, will be:

15. The difference in the length of a mean solar day and a sidereal day is about: