(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

Give reason for the following:

The efficiency of a movable pulley is always less than 100%.

What do you mean by the term local earthing? Explain how it is done.

The metal case of an electric appliance is earthed explain the reason.

1. The earthing of an electric appliance is useful only if the fuse is in the live wire. Give the reason.
2. Name the part of the appliance which is earthed.

For earthing an electrical appliance, one has to remove the paint from the metallic body of the appliance where the electrical contact is made. Explain the reason.

Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

A movable pulley is used as ______.

Name the material used for making the connection wires. Give a reason for your answer.

Name a material which is used for making the standard resistor. Give a reason for your answer.

Name the material used for making a fuse wire. Give a reason.

Name the material used for filament of an electric bulb.

Name the material used for heating element of a room heater.

Define the term potential energy of a body.

The potential energy of a body is the energy by virtue of its ______.

A body at a height possesses ______.

A converging lens forms the image of an object placed in front of it beyond 2F₂ of the lens. Where is the object placed?

A converging lens forms the image of an object placed in front of it, beyond 2F₂ of the lens. State three characteristics of the image.

A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the adjacent fig. When the trolley is released, it is found to move at a speed v = 2 m s^-1. What potential energy did the spring possess when compressed?

Draw a ray diagram to show how a converging lens can form a real and enlarged image of an object.

Draw a ray diagram to show how a converging lens can form an image of the sun. Hence give a reason for the term ‘burning glass’ for a converging lens used in this manner.