Science (Electric current and it's effects)

The most suitable material for making the core of an electromagnet is:

• Iron

• Aluminum

• Brass

• Steel

Assertion- Only Iron is used for making electromagnets.

Reason- Iron behaves as a magnet.

• Assertion is false and reason is true.

• Both are false.

• Assertion is true but the reason is not the correct explanation of assertion.

• Assertion is true and reason is the correct explanation of assertion.

If the current through the coil stops flowing. Will the coil remain an electromagnet?

• No

• Yes

• Maybe

• Not sure

Electromagnets are not used to lift heavy loads.

• True

• False

The magnetic effect of electric current was discovered by-

• Maxwell

• Darwin

• Oersted

• Newton

The more rolls of wire on iron screw, lesser pins will attract

• True

• False

If the number of turns in the coil of an electromagnet is more, the strength of the electromagnet will be

• lesser

• greater

• none of these

• same

Find the odd one out

• Electric motor

• Electric bulb

• Electric bell

• Loud Speaker

An ____________ behaves like a magnet when an electric current passes through it.

• electromagnet

• switch

• cell

• wire

If we keep a compass inside a cardboard with cell and switch attached, it shows magnetic effect of current.

• True

• False