Physics

Q.

The force of gravitation between two bodies in the universe does not depend on:

1. the distance between them

2. the product of their masses

3. the sum of their masses

4. gravitational constant

Q. The masses of two planets are in the ratio 1:2. Their radii are in the ratio 1:2. The acceleration due to gravity on the planets are in the ratio:

1. 3:5
2. 5:3
3. 1:2
4. 2:1

Q.

Gravitational force is proportional to the product of the_____ and inversely proportional to the square of _____ between two bodies.

1. distance, masses

2. masses, distance

3. weights, displacement

4. None of these

Q. List out the physical quantities on which the gravitational force between objects depends. [2 MARKS]

Q.

Define gravitational force quantitatively.

1. 

2. 

3. 

4. 

Q. A body weighs 72 N on the surface of the Earth. What will be the force of gravity acting on the body at a height equal to half the radius of the Earth above the Earth's surface?

1. 32 N
2. 20 N
3. 10 N
4. 0 N

Q. If mass and radius of the Earth are $6.0\times {10}^{24}kg$ and $6.4\times {10}^{6}m$ respectively. Calculate the force exerted by the Earth on a body of mass 1 kg, acceleration of the body of mass 1 kg and acceleration of the Earth in order.
Use $G=6.67\times {10}^{-11}N{m}^{2}k{g}^{-2}$

1. $9.8N$
   $9.8m{s}^{-2}$
   $1m{s}^{-2}$
2. $9.8N$
   $9.8m{s}^{-2}$
   $1.63\times {10}^{-24}m{s}^{-2}$
3. $9.8N$
   $1.63\times {10}^{-24}m{s}^{-2}$
   $9.8m{s}^{-2}$
4. $9.8N$
   $9.8m{s}^{-2}$
   $9.8m{s}^{-2}$

Q. Newton's law of gravitation is applicable to:

1. Bodies on earth only
2. Bodies on planets only
3. Bodies in our solar system only
4. All bodies in the universe

Q.

State the universal law of gravitation.
[2 MARKS]

Q.

If $F_1$ is the magnitude of the force exerted on the Sun by Earth and $F_2$ is the magnitude of the force exerted on Earth by the Sun, then :

1. $F_1$ and $F_2$ cannot be compared

2. $F_1>F_2$

3. $F_1=F_2$

4. $F_1<F_2$