ICSE ICSE Class 8 - CISCE Question Bank Solutions

State one property of the material of a fuse wire.

Name the material of a fuse wire.

Can we use copper wire as a fuse wire? Give reason.

How does a fuse protect the electric wiring (or an appliance) from being damaged?

Which fuse wire is thick: 5 A or 15 A?

With which wire: live or neutral is the fuse wire connected?

What do you mean by short-circuiting of a circuit?

State the colour coding of the three wires in a cable used for

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.