Fun with Magnets

A student places the following objects near a magnet and records her observations: Steel spoon Leather belt Aluminium foil Nickel coin Which object(s) will NOT respond to the magnet?

1. Leather belt and aluminium foil
2. Coin and aluminium foil
3. Steel spoon and coin
4. Leather belt and steel spoon

Answer: (a) Leather belt and aluminium foil

You’re testing a cloth bag for hidden metallic objects using a magnet. What property of the magnet allows this method to work?

1. Magnets repel plastic
2. Magnetic force acts only on iron
3. Magnetic force works only in vacuum
4. Magnetic force can act through materials

Answer: (d) Magnetic force can act through materials

A field mechanic needs to magnetize a screwdriver to pick up tiny screws in a windy outdoor area. He has access to a single bar magnet only. Which method should he use to magnetize the screwdriver effectively?

1. Rub the screwdriver with the bar magnet in one direction repeatedly
2. Strike the screwdriver with the bar magnet continuously
3. Rub the screwdriver with the magnet in alternating directions
4. Rub both ends with opposite poles of the magnet

Answer: (a) Rub the screwdriver with the bar magnet in one direction repeatedly

A scientist wants to make a magnet that works only when electricity is passed and stops when it's off. Which material and type of magnet should be chosen?

1. Magnetite with natural magnetism
2. Iron core with an electric coil around it
3. Cobalt rod with bar magnet
4. Nickel bar permanently magnetized

Answer: (b) Iron core with an electric coil around it

If a magnet is dropped repeatedly on a hard floor, which of the following logical chain of events is most accurate?

1. Shape changes → No poles remain → Loses mass
2. Sound produced → Poles neutralize → Magnet cools down
3. Impact → Particle misalignment → Loss of magnetic properties
4. Friction increases → Poles multiply → Magnetic field strengthens

Answer: (c) Impact → Particle misalignment → Loss of magnetic properties

Choose all incorrect statements: 1. A compass needle’s North pole points to Earth's magnetic North pole. 2. The magnetic field of Earth is visible and can be photographed. 3. Earth's magnetic North pole is near the geographic South Pole. 4. The Earth's magnetic field is caused by moving clouds in the sky.

1. 1 and 2 only
2. 2 and 4 only
3. 1, 2, and 4
4. All are incorrect

Answer: (b) 2 and 4 only

A student attaches a nail to a bar magnet and then picks up some pins with the nail. Later, the nail alone can still pick up a few pins. What can be inferred?

1. The nail turned into a natural magnet
2. The nail became a weak permanent magnet
3. The magnet lost its power to the nail
4. The nail became a temporary magnet

Answer: (d) The nail became a temporary magnet

A magnet is cut into pieces, but surprisingly, one of the pieces doesn't attract iron at all. All others do. What’s the best explanation?

1. It is the middle part and has no poles
2. It had very weak magnetic field
3. It’s too small to behave like a magnet
4. It was affected by heat or hammering during cutting

Answer: (d) It was affected by heat or hammering during cutting

You magnetize an iron rod using single touch method and then slowly bring both ends near a test tube filled with iron filings. One end attracts a lot; the other barely moves any filings. What can be inferred about the stroke direction?

1. Strokes were performed in both directions
2. Strokes were performed consistently from one end
3. The bar magnet used had weak magnetism
4. The iron rod is non-magnetic

Answer: (b) Strokes were performed consistently from one end

A student connects the poles of a horseshoe magnet using a copper strip and stores it in a humid environment. What compound effect is most likely to occur over a month?

1. Magnetic field shifts, creating temporary poles at the center
2. The copper absorbs magnetic energy, weakening the magnet
3. The humidity causes rust, and copper doesn’t redirect magnetic field
4. The poles reverse and start attracting each other

Answer: (c) The humidity causes rust, and copper doesn’t redirect magnetic field