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Fun With Magnets - 2

Fun With Magnets - 2

10 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following activities does not cause demagnetisation of magnets?

  1. Hitting
  2. Hammering
  3. Dropping
  4. Suspending
Question 2 Multiple Choice (Single Answer)

Why is it advised not to heat a magnet?

  1. Heating leads to demagnetisation.
  2. Heating increases the strength of the magnet.
  3. Heating breaks the magnet.
  4. Heating melts the magnets.
Question 3 Multiple Choice (Single Answer)

What should be kept across the poles of a horseshoe magnet to save it from demagnetisation?

  1. Wooden pieces
  2. Aluminium sheet
  3. Iron pieces
  4. Plastic sheet
Question 4 Multiple Choice (Single Answer)

You should not store a CD near a magnet because

  1. the magnet will rust
  2. the magnet will become weaker
  3. the information in the disk may get erased
  4. the magnet will break the disk
Question 5 Multiple Choice (Single Answer)

Which material is used to make magnetic keepers?

  1. Nickel
  2. Soft iron
  3. Steel
  4. Copper
Question 6 Multiple Choice (Single Answer)

Which of the following items are needed to make an electromagnet?

  1. An iron nail, a battery and a copper wire
  2. An iron nail, a battery and a plastic wire
  3. An iron nail, a copper wire and wooden sticks
  4. None of these
Question 7 Multiple Choice (Single Answer)

Magnets should be stored safely because they

  1. become weak if handled carelessly
  2. are expensive
  3. break easily
  4. attract all substances
Question 8 Multiple Choice (Single Answer)

Magnets should be kept away from

  1. a cellphone
  2. a television
  3. a music system
  4. all of the above
Question 9 Multiple Choice (Single Answer)

Electric bell works on the principle of

  1. electromagnetism
  2. electromagnetic induction
  3. diffraction
  4. dispersion
Question 10 Multiple Choice (Single Answer)

For safe storage, which of the following should not be kept between two bar magnets?

  1. A piece of iron
  2. A piece of wood
  3. A thick cardboard sheet
  4. A piece of thermocol
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