A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will:

1. continue to move with velocity v along the original orbit.

2. move with a velocity v tangentially to the orbit.

3. fall down with increasing velocity.

4. ultimately come to rest somewhere on the original orbit.

The relay satellite transmits the television signals continuously from one part of the world to another because its:

1. period is greater than the period of rotation of the earth.

2. period is less than the period of rotation of the earth.

3. period has no relation with the period of the earth about its axis.

4. period is equal to the period of rotation of the earth about its axis.

If the height of a satellite from the surface of the earth is increased, then its:

1. potential energy will increase.

2. kinetic energy will decrease.

3. total energy will increase.

4. All of these

Which of the following diagrams most closely shows the variation in kinetic energy of the Earth as it moves once around the Sun in its elliptical orbit ?

1. 

2. 

3. 

4. 

Starting from the centre of the Earth having radius R, the variation of g (acceleration due to gravity) is shown by:

1. 

2. 

3. 

4. 

On doubling the distance between two masses, the gravitational force between them will:

1. remains unchanged.

2. becomes one-fourth.

3. becomes half.

4. becomes double.

Newton's law of gravitation is true for:

1. only uncharged particles.

2. only for planets.

3. only for heavenly bodies.

4. All the bodies.

The gravitational force between two bodies is:

1. repulsive at short distances

2. attractive at large distances

3. repulsive at large distances

4. attractive at all distances

A body is in a state of rest at infinite distance. If it is made a satellite of Earth, which of the following physical quantities will be reduced?

1. Gravitational force

2. Kinetic energy

3. Potential energy

4. Mass.

The Earth is an approximate sphere. If the interior contained matter that is not of the same density everywhere, then on the surface of the Earth, the acceleration due to gravity:

1. will be directed towards the centre but not the same everywhere.

2. will have the same value everywhere but not directed towards the centre.

3. will be same everywhere in magnitude directed towards the centre.

4. cannot be zero at any point.