ICSE ICSE Class 7 - CISCE Question Bank Solutions

Select the correct alternative

An electromagnet is used in 

Select the correct alternative

The purpose of armature in an electric bell is

What is an electromagnet?

Name the material of an electromagnet?

Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps the procedure ?

You are given a U shaped soft iron piece, insulated copper wire and a battery. Draw a circuit diagram to make a horse shoe electromagnet ?

Name two factors on which the strength of magnetic field of an electromagnet depends ?

State two ways by which the strength of magnetic field of an electromagnet can be increased ?

State two common uses of electromagnets  ?

Name a domestic device in which an electromagnet is used ?

Draw a neat and labelled diagram of an electric bell and describe its working ?

The incomplete diagram of an electric bell is given in fig. Complete the diagram and label its different parts ?

The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer.

Write true or false for a given statement.

On touching a lump of ice, we feel cold because some heat passes from our body to the ice.

Write true or false for a given statement.

Medium is necessary for the transfer of heat by radiation.

Write true or false for a given statement.

Liquids are heated by conduction and radiation.

Write true or false for a given statement.

Black surfaces are the poor absorbers of heat radiations.

Fill in the blank

A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________

Fill in the blank

Heat transfer in solids is by ______

Fill in the blank

Heat transfer in liquids and gases is by ________.