Magnets

What is a magnet?

• a) A device that produces sound
• b) A substance that attracts iron
• c) A type of battery
• d) A form of light

Answer explanation

Magnets specifically attract ferromagnetic materials like iron.

Which of these is a natural magnet?

• a) Steel bar
• b) Earth
• c) Iron nail
• d) Copper wire

Answer explanation

Earth has a magnetic field due to its molten iron core.

Like poles of a magnet ______ each other

• a) Attract
• b) Repel
• c) Ignore
• d) Combine with

Answer explanation

Like poles (N-N or S-S) repel; opposites attract.

Magnetic field lines ______

• a) Cross each other
• b) Never cross
• c) Disappear in air
• d) Only exist inside the magnet

Answer explanation

Magnetic field lines are continuous and never intersect.

Why does a temporary magnet lose its magnetism easily?

• a) It is made of steel
• b) It is hard to magnetize
• c) It is easy to magnetize but loses magnetism quickly
• d) It is not affected by magnetic fields

Answer explanation

Temporary magnets (e.g., iron) lose alignment easily.

What happens when a North pole is brought near a South pole?

• a) They repel
• b) They attract
• c) Nothing happens
• d) They cancel each other

Answer explanation

Opposite poles (N-S) attract.

Inside a magnet, magnetic field lines travel from:

• a) North to South
• b) South to North
• c) East to West
• d) They don’t exist inside

Answer explanation

inside the magnet, field lines complete the loop from S to N.

Why does Earth behave like a magnet?

• a) Due to its iron core
• b) Because of the Moon
• c) Due to its water content
• d) Because of the Sun

Answer explanation

Earth’s liquid outer core generates its magnetic field.

What is the main difference between temporary and permanent magnets?

• a) Temporary magnets are always stronger
• b) Permanent magnets retain magnetism longer
• c) Temporary magnets are natural
• d) Permanent magnets are only made of iron

Answer explanation

Steel alloys (permanent) resist demagnetization better than iron.

If you break a magnet into two pieces, what happens?

• a) Only one piece remains magnetic
• b) Both pieces lose magnetism
• c) Each piece becomes a new magnet with two poles
• d) The pieces attract each other

Answer explanation

Breaking a magnet creates new poles on each fragment.