Gravitation Tes...

Assertion Gravitational potential of earth at every place on it is negative.
Reason Every body on earth is bound by the attraction of earth.

Assertion Even when orbit of a satellite is elliptical , its plane of rotation passes through the centre of earth.
Reason According to law of conservation of angular momentum plane of rotation of satellite always remain same.

Assertion A planet moves faster, when it is closer to the sun in its orbit and vice versa.
Reason Orbital velocity in the orbit of planet is constant.

Assertion Orbital velocity of a satellite is greater than its escape velocity
Reason Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.

Assertion The time period of geostationary satellite is 24 hr.
Reason Geostationary satellite must have the same time period as the time taken by the earth to complete one revolution about its axis .

Assertion The principle of superposition is not valid for gravitational force.
Reason Gravitational force is a conservative force.

Assertion Two different planets have same escape velocity
Reason Value of escape velocity is a universal constant.

Assertion The time period of revolution of a satellite close to surface of earth is smaller than that revolving away from surface away from surface of earth.
Reason The square of time period of revolution of a satellite is directly proportional to cube of its orbital radius.

Assertion For a satellite revolving very near to earth\'s surface the time period of revolution is given by 1 hour 24 minutes.
Reason The period of revolution of a satellite depends only upon its height above the earth\'s surface.

Assertion Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very large height
Reason The path of a projectile is independent of the gravitational force of earth.