Question

A. Multiple choice questions.
1. Which of the following is a magnetic material
a. A copper nail.
b. An iron nail.
C. A brass screw.
d. Aluminium wire.
2. Which of these is not a magnetic material
a. Silver.
b. Nickel.
c. Steel.
d. Cobalt.
3. A freely suspended bar-magnet will come to lie in the direction
a. North-east direction.
b. East-west direction.
c. North-south direction.
d.In any direction.
4. A magnet is made from
a. steel.
b. Iron.
c. Aluminum.
d. All of these.
5. In which of these shapes we can have a magnet
a. Ring.
b. U-shape.
c. Bar.
d. Any of these.
6. What happens when we heat a magnet on flame
a. It gains magnetic force.
b. Its poles are interchanged.
c. lt loses its magnetism.
d. Nothing happens.
7. Which of the following will save a magnet from demagnetizing
a. Dropping in on a hard floor.
b. Hammering it.
c. Heating on flame.
d.Storing it along keepers.​

Answer 1

Answer:

12. b

13. c

14. c

15. d

16. a

17. d

18. b

Explanation: