ICSE ICSE Class 8 - CISCE Question Bank Solutions for Physics

Why is the metal covering of an electrical appliance earthed?

Gravitational potential energy U = mass × force of gravity on unit mass × ..........

State two factors on which the potential energy of a body at a certain height above the ground depends.

Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground. Which of the two has greater potential energy?

Equal volumes of different liquids expand by a different amount when they are heated to the same rise in temperature.

Kerosene contracts on heating.

A bucket full of water is on the first floor of your house and another identical bucket with the same quantity of water is kept on the second floor. Which of the two has greater potential energy?

Write the expression for the gravitational potential energy explaining the meaning of the symbols used.

A body of mass m is moved from ground to a height h. If the force of gravity on mass of 1 kg is g newton, find the force needed to lift the body.

A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find the work done in lifting the body.

A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find the potential energy stored in the body.

A longer rod expands ........... than a shorter rod on being heated to the same temperature.

The increase in length of a metal rod depends on 

What is matter? What is it composed of? 

Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.

Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 n.

The gravitational potential energy stored in a box of weight 150 kgf is 1.5 × 10⁴ J. Find the height of the box. Take 1 kgf = 10 N.

What do you understand by thermal expansion of a substance?

State three factors on which depend the linear expansion of a metal rod on heating.

Two iron rods – one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?