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

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 ms^-2, find: the initial velocity of the ball.

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 ms^-2 , find : 
the final velocity of the ball on reaching the ground .

A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be 10 ms^-2 , find : 
the total time of journey of the ball .

What is hydro energy? Explain the principle of generating electricity from hydro energy. How much hydro electric power is generated in India?

Multiple Choice Question. Select the correct option.

The mass of earth is 6 × 10²⁴ kg and radius of earth is 6.4 × 10⁶ m. The magnitude of force between the mass of 1 kg and the earth is:

Define one Newton. How much maximum acceleration can it produce in a mass of 1 kg?

The acceleration produced by a force in an object is directly proportional to the applied _________ And inversely proportional to the _________ Of the object.

Who stated the law of gravitation?

Distinguish between gravity and gravitation

How will the force of gravitation between two objects change if the distance between them is:
Halved

How will the force of gravitation between two objects change if the distance between them is:
Doubled

How will the force of gravitation between two objects change if the distance between them is:
Made four times

How will the force of gravitation between two objects change if the distance between them is:
Infinite

How will the force of gravitation between two objects change if the distance between them is:
Almost zero

All objects in the universe attract each other along the line joining their________.

The force of attraction between any two material objects is called __________.

Is the law of gravitation applicable in case of the sun and the moon?

Why don't you feel the force of attraction between your friend sitting close to you and yourself?

A ball is thrown up with a speed of 4.9 ms^-1.
Calculate the maximum height it would gain before it begins to fall.

A ball is thrown up with a speed of 4.9 ms^-1.
Calculate the time it takes to reach this height.