Magnets

Which of the following metals cannot be attracted by a magnet?

• Nickel

• Copper

• Iron

• Steel

A magnet can ________________ and ________________ another object without touching it.

Magnets A, B, C and D attracted a nail from different distances as shown:

Magnet A - Attracted nail from 10cm away

Magnet B - Attracted nail from 2cm away

Magnet C - Attracted nail from 5cm away

Magnet D - Attracted nail from 7cm away

Arrange the magnets in order, starting from the strongest magnet.

• A, B, C, D

• A, D, C, B

• 
  B, C, D, A

• D, A, C, B

Which of the following mixtures of items can be separated using a magnet only?

• 
  flour and sugar

• iron powder and steel powder

• rice and copper powder

• iron powder and copper powder

A freely suspended magnet will always point in a __________ direction.

• east-west

• east-north

• 
  north-south

• north-west

The diagram below shows a compass placed between two strong bar

magnets, A and B. Which of the following options correctly shows the label on the poles of the

two bar magnets?

• Part X: North

  Part Y: North

• Part X: South

  Part Y: South

• Part X: North

  Part Y: South

• Part X: South

  Part Y: North

6

Based on the results in the table above, which parts are most likely to be at the two poles of the magnet?

• 1. W and X

• 1. X and Y

• Y and Z

• W and Z

What can Thomas conclude based on the results?

• 1. Magnet C is the weakest magnet

• 1. Magnet B is the strongest magnet

• 1. Dropping magnets has no effect on their magnetism

• 1. Magnets lose some of their magnetism after being dropped

Which of the following options shows the most likely observation Dayne would have made for electromagnet A and B?

• No. of iron nails attracted by electromagnet A: 0

  No. of iron nails attracted by electromagnet B: 8

• No. of iron nails attracted by electromagnet A: 3

  No. of iron nails attracted by electromagnet B: 7

• No. of iron nails attracted by electromagnet A: 8

  No. of iron nails attracted by electromagnet B: 4

• No. of iron nails attracted by electromagnet A: 0

  No. of iron nails attracted by electromagnet B: 12

Which of the following can X and Y be made of so that the door can be kept open?

• X: Steel

  Y: Iron

• X: Steel

  Y: Magnet

• X: Copper

  Y: Aluminium

• X: Magnet

  Y: Aluminium