Question

13. A freely suspended magnet will align itself

(1) along the earth's equator

(2) perpendicular to the line joining the earth's North Pole and South Pole

(3) in any direction

(4) along the line joining the earth's North Pole and South Pole

14. A device consisting of a small magnetic needle used to find directions on the earth's surface is

called

(1) a magnetometer (2) a magnet

(3) a magnetic compass (4) a pathfinder

15. When two magnets are brought close together,

(1) like poles attract and unlike poles repel each other

(2) attraction or repulsion depends on the orientation of the magnets

(3) like poles repel and unlike poles attract each other

(4) attraction or repulsion depends on the shape of the magnets

16. The chemical formula of magnetite (natural magnet) is :

(1) Fe2O3

(2) Fe3O4

(3) FeO (4) FeO2

17. The poles of the magnet always exist in

(1) pairs (2) single

(3) both (1) and (2) (4) cant say

18. The magnet can be demagnetised by

(1) hammering (2) heating

(3) dropping from height (4) all of these

19. Which of the following statements is true ?

(1) An electromagnet does not attract a piece of iron.

(2) An electric current flowing in a circuit deflects a magnetic needle.

(3) An electromagnet is a permanent magnet.

(4) An electromagnet can be used to separate plastic bags from a garbage heap

20. If there are 3 bar magnets, the total number of poles will be :

(1) 2 (2) 6 (3) 3 (4) 4

Multiple Choice Correct Questions

21. Which of the following are attracted by a magnet?

(1) Iron (2) Nickel (3) Aluminium (4) Paper

22. The poles that repel are :

(1) North-North (2) South-South

(3) North-South (4) South-North​

Answer 1

Answer:

13 is 4, 14 is 3, 15 is 3, 16 is (I it's 2), 17 is 1, 18 is 4, 19 is 3, 20 is 2, 21 is 1, 22 is 1 & 2

Explanation:

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Answer 2

Sorry your question is too big