(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

A light ball falling on ground, after striking the ground rises upwards. Explain the reason.

How does the gravitational force of attraction between two masses depend on the distance between them?

How is the gravitational force between two masses affected if the separation between them is doubled?

Define gravitational constant G.

Write the numerical value of gravitational constant G with its S.I. unit .

What is the importance of law of gravitation ?

Write an expression for the force due to gravity on a body of mass m and explain the meaning of symbols used in it.

Write down the average value of g on Earth's surface ?

The gravitational force between two bodies is : 

The value of G is : 

The force of attraction between two masses each of 1 kg kept at a separation of 1 m is : 

The force of attraction between two bodies at certain separation is 10 N. What will be the force of attraction between them if the separation is reduced to half? 

A body falls from the top of a building and reaches the ground 2.5 s later. How high is the building? (Take g = 9.8 m s^-2)

What is wind energy? How is wind energy used to produce electricity? How much electric power is generated in India using the wind energy?

State unit of momentum in the CGS system.

State unit of momentum in the SI system.

Define absolute units of force in CGS as well as the SI system.

Explain the following:

Why does a boatman push the bank backward with a long bamboo pole, on launching his boat in the water?

State unit of mass in CGS system.

Describe, briefly how can you calculate the value of ‘g’ with a simple pendulum.