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 speed of satellite always remains constant in an orbit.
Reason The speed of a satellite depends on its path.

Assertion Earth has an atmosphere but the moon does not.
Reason Moon is very small in comparison to earth.

Assertion The time period of geostationary satellite is 24 hours.
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 of earth.
Reason The square of time period of revolution of a satellite is directly proportional to cube of its orbital radius.