Fun with Magnets Quiz

Which of these statements about temporary magnets is incorrect? 1. They lose magnetism quickly. 2. Soft iron can be used to make them. 3. They attract all materials. 4. They are used in electromagnets.

1. 1 and 2
2. 3 only
3. 2 and 4
4. 1, 2 and 4

Answer: (b) 3 only

What does the experiment demonstrate about the relationship between electricity and magnetism?

1. They are independent to each other
2. Electricity destroys magnetic fields
3. Electric current can create magnetic effects
4. Only magnets can generate fields

Answer: (c) Electric current can create magnetic effects

Which of the following summarises the image correctly?

1. X – attract, Y – attract, Z – repel
2. X – neutral, Y – repel, Z – attract
3. X – attract, Y – repel, Z – repel
4. X – repel, Y – attract, Z – repel

Answer: (c) X – attract, Y – repel, Z – repel

A student places paperclips at different distances from various magnets. The table shows how many paperclips each magnet attracted. Which magnet most likely has the strongest magnetic field? Magnet Distance (cm) Number of Paperclips Attracted M1 2 4 M2 5 5 M3 3 2

1. M1, because it worked at the closest distance
2. M2, because it attracted more objects at a greater distance
3. M3, because fewer paperclips show weaker force
4. Cannot be determined as paperclips are not magnetic

Answer: (b) M2, because it attracted more objects at a greater distance

If a second nail is placed at the free end of the first iron nail (which is touching the magnet), what will happen?

1. It will fall off
2. It will repel
3. It will be attracted
4. It will become permanently magnetic

Answer: (c) It will be attracted

Four students created electromagnets using the same iron nail and identical batteries, but varied the number of coil turns around the nail. Based on the setups shown, which electromagnet is expected to attract the MOST paper clips?

1. Setup A
2. Setup B
3. Setup C
4. Setup D

Answer: (d) Setup D

A permanent magnet is placed close a bar of soft iron AB. What will happen?

1. A becomes south pole
2. A becomes north pole
3. AB does not become magnetised
4. The poles of the magnet will be reversed

Answer: (a) A becomes south pole

Read the statements and fill the blanks: A. The device that uses a magnetised needle to show direction is called a __________. B. The magnetic force is weakest at the __________ of a bar magnet. C. The needle of a magnetic compass is a small __________ magnet.

1. A- magnetoscope, B- ends, C- horseshoe
2. A- periscope, B- poles, C- U- shaped
3. A- gyroscope, B- surface, C- cylindrical
4. A- magnetic compass, B- centre, C- bar

Answer: (d) A- magnetic compass, B- centre, C- bar

Which combination of properties is unique to natural magnetite?

1. Conductive, magnetic, forms crystals
2. Lustrous, brittle, magnetic
3. Soft, magnetic, yellow
4. Oxidised, magnetic, brownish-red

Answer: (a) Conductive, magnetic, forms crystals

Which statement is most correct regarding the care of magnets during storage?

1. Magnets should be stored touching each other directly
2. Magnets should be kept near strong lights
3. Magnets should be kept apart, unshielded
4. Magnets should be stored with keepers and away from vibration

Answer: (d) Magnets should be stored with keepers and away from vibration