Magnetism Quiz

Which statement about a magnet is correct?

• A magnet attracts a gold rod.

• A magnet does not attract a plastic rod.

• A magnet never repels another magnet.

• A magnet sometimes repels an unmagnetised nickel rod.

A student wishes to make a permanent magnet. She has an iron rod and a steel rod. Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

• iron rod with hard magnetic material

• iron rod with soft magnetic material

• steel rod with hard magnetic material

• steel rod with soft magnetic material

Two nickel bars are placed close to the N-pole of a bar magnet. The nickel bars become magnetised.

• Pole induced at P is N, pole induced at Q is S, force between P and Q is attraction.

• Pole induced at P is N, pole induced at Q is S, force between P and Q is repulsion.

• Pole induced at P is S, pole induced at Q is N, force between P and Q is attraction.

• Pole induced at P is S, pole induced at Q is N, force between P and Q is repulsion.

Which action will demagnetise a magnetised piece of steel?

• Cool it in a freezer for several hours.

• Hit it repeatedly with a hammer.

• Put it in a coil carrying a direct current (d.c.).

• Put it near an unmagnetised piece of iron.

Which statement about magnetism is correct?

• An unmagnetised iron bar becomes magnetised when it is placed near a magnet.

• An unmagnetised steel bar can be magnetised by passing a current through it.

• The direction of magnetic field lines is from an S-pole to an N-pole.

• The N-poles of two magnets attract each other.

A student wishes to make a permanent magnet. She has an iron rod and a steel rod. Which rod should she use to make the permanent magnet, and is this rod a hard magnetic material or a soft magnetic material?

• Iron rod, hard magnetic material

• Iron rod, soft magnetic material

• Steel rod, hard magnetic material

• Steel rod, soft magnetic material

Which statement about a permanent bar magnet is correct?

• It is made from a soft magnetic material.

• It repels a non-magnetic material.

• Its field lines cross each other where the magnetic field is strong.

• Its N-pole repels the N-pole of another magnet.

Which metal could be used for a permanent magnet and which metal could be used for the core of an electromagnet?

• Iron for permanent magnet, copper for core of electromagnet

• Iron for permanent magnet, iron for core of electromagnet

• Steel for permanent magnet, copper for core of electromagnet

• Steel for permanent magnet, iron for core of electromagnet

A student investigates the force on a bar magnet placed near a current-carrying coil. She carries out three different experiments. In experiment 1, the magnet is attracted to the coil. Which row shows what happens in the other two experiments?

• exp 2: magnet attracted, exp 3: magnet attracted

• exp 2: magnet attracted, exp3: magnet repelled

• exp 2: magnet repelled, exp 3: magnet attracted

• exp 2: magnet repelled, exp 3: magnet repelled

In which pair are both materials magnetic?

• aluminium and copper

• copper and iron

• iron and steel

• steel and aluminium