Physics Gravitation Test 2 Online MCQs

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

2. The ratio of the radii of two planets r₁ and r₂ is k. The ratio of acceleration due to gravity on them is r. then the ratio of the escape velocities from them, will be:

3. 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

4. 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

5. 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

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

7. Gravitational mass is proportional to the gravitational:

8. A geostationary satellite is orbiting the earth at a height of 6 R from the earth’s surface (R is the earth’s radius). What is the period of rotation of another satellite at a height of 2.5 R from the earth’s surface

9. The force of gravitation is

10. 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:

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

12. 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:

13. Height of geostationary satellite is

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

15. 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