Q1
What happens when we hit a magnet with a hammer?
- The north and south poles change positions
- It gains more magnetic force
- It demagnetises
- 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
- Bar magnet
- Permanent magnet
- Temporary magnet
- 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
- Permanent magnets
- Natural magnets
- Temporary magnets
- Artificial magnets
Answer:
The correct answer is (c) - Temporary magnets.
Q4
Which of the following can be converted into magnet?
- Iron
- Wood
- Stone
- Clay
Answer:
The correct answer is (a) - Iron.
Q5
Attraction is maximum at the………
- Centre
- Poles
- Both (A) and (B)
- 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.
