Check sibling questions

Q1

What happens when we hit a magnet with a hammer?

  1. The north and south poles change positions
  2. It gains more magnetic force
  3. It demagnetises
  4. Nothing happens

 

Answer:

By hammering a magnet we are actually trying to change the orientation of magnetic property of material which are making them magnet . If the alignment of magnetic property of material get change it would not work as magnet.

So, the correct answer is (c) - It demagnetises

 

Q2

The electromagnet is a 

  1. Bar magnet
  2. Permanent magnet
  3. Temporary magnet
  4. Damaged magnet

 

Answer:

Electromagnets behave as a magnet only when electric current flows through them. So, they are temporary magnets.

The correct answer is (c) Temporary magnet.

 

Q3

The magnets which lose their property of magnetism after a short period of time are called

  1. Permanent magnets
  2. Natural magnets
  3. Temporary magnets
  4. Artificial magnets

 

Answer: 

The correct answer is (c) - Temporary magnets.

 

Q4

Which of the following can be converted into magnet?

  1. Iron
  2. Wood
  3. Stone
  4. Clay

 

Answer: 

The correct answer is (a) - Iron.

 

Q5

Attraction is maximum at the………

  1. Centre
  2. Poles
  3. Both (A) and (B)
  4. None of these

 

Answer:

The magnetic force of attraction is greater where the field lines are crowded . Since all the magnetic fields lines emerge from the poles so the crowd or concentration or density of field lines is maximum near poles.  

The correct answer is (b) - Poles.

Maths Crash Course - Live lectures + all videos + Real time Doubt solving!

Ask a doubt (live)
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo