A small satellite is revolving near earth's surface. Its orbital velocity will be nearly:

1. 8 km/s

2. 11.2 km/s

3. 4 km/s

4. 6 km/s

If the potential energy of a satellite is -2 MJ, then the binding energy of the satellite is:

1. 1 MJ

2. 2 MJ

3. 8 MJ

4. 4 MJ

The time period of a polar satellite is about:

1. 24 hr

2. 100 min

3. 84.6 min

4. 6 hr

The mean radius of the earth is R and its angular speed on its axis is $\mathrm{\omega }$. What will be the radius of orbit of a geostationary satellite?

1. ${\left(\frac{\mathrm{Rg}}{{\mathrm{\omega }}^2}\right)}^{1/3}$

2. ${\left(\frac{{\mathrm{R}}^2\mathrm{g}}{{\mathrm{\omega }}^2}\right)}^{1/3}$

3. ${\left(\frac{{\mathrm{R}}^2\mathrm{g}}{\mathrm{\omega }}\right)}^{1/3}$

4. ${\left(\frac{{\mathrm{R}}^2{\mathrm{\omega }}^2}{\mathrm{g}}\right)}^{1/3}$

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.