Quiz on Electromagnets For Class 7

A substance is _______ if it is attracted to a magnet.

• Ferrous

• Magnetic

• Magnetized

• Magnet

The components of an electromagnet are:

• Coil and Core

• Cell, Coil and Core

• Core

• Cell, Switch, Coil and Core

Electromagnets are:

• Solenoids

• Temporary magnets

• Permanent magnets

• Weak magnets

• All of the above

When an electric current is passed through the coil in an electromagnet, the core becomes

• Magnet

• Magnetized

• Electric

• All of the above

Which one of the following is magnetic material

• Zinc

• Aluminum

• Silver

• None of the above

When a circuit is _________, the magnetic field in generated.

Which one of the following factors does not affect the strength of an electromagnet.

• Temperature

• Number of turns on the coil

• Voltage of the cell

• Nature of the core

How can you find out which pole of an electromagnet is north? Tick all correct

• Using magnetic material

• Using a thermometer

• Using a compass

• Checking the voltage of the cell

• Using another magnet

Electric motors change electric energy to

• Thermal energy

• Chemical energy

• Sound energy

• Kinetic energy

The ______ of an electromagnet can be measured by the force it exerts on _________ material.

• Speed; Magnet

• Strength; Magnet

• Durability; Magnet

• Speed; Magnetic

• Strength; Magnetic