9th class Physics, Chapter 8: Magnetism MCQs

1. Which one of the following is not a magnetic material?

1. (A) Cobalt
2. (B) Iron
3. (C) Aluminium ✓
4. (D) Nickel

2. Magnetic lines of force:

1. (A) are always directed in a straight line
2. (B) cross one another
3. (C) enter into the north pole
4. (D) enter into the south pole ✓

3. Permanent magnets cannot be made by:

1. (A) soft iron ✓
2. (B) steel
3. (C) neodymium
4. (D) alnico

4. Permanent magnets are used in:

1. (A) circuit breaker
2. (B) loudspeaker ✓
3. (C) electric crane
4. (D) magnetic recording

5. A common method used to magnetise a material is:

1. (A) stroking ✓
2. (B) hitting
3. (C) heating
4. (D) placing inside a solenoid having A.C

6. A steel rod AB is magnetised by the double touch stroking method, the unlike poles of two permanent magnets being moved from the centre towards end A (with an S-pole) and towards end B (with an N-pole). The correct polarity of the magnet AB is:

1. (A) A is N-pole and B is S-pole ✓
2. (B) A is S-pole and B is N-pole
3. (C) both A and B are N-poles
4. (D) both A and B are S-poles

7. The best material to protect a device from external magnetic field is:

1. (A) wood
2. (B) plastic
3. (C) steel
4. (D) soft iron ✓

8. Magnetism is a force that acts at a distance upon:

1. (A) liquids only
2. (B) magnetic materials ✓
3. (C) all materials
4. (D) plastics only

9. Which of the following materials is attracted by a magnet?

1. (A) Nickel ✓
2. (B) Copper
3. (C) Glass
4. (D) Wood

10. Which of the following is a non-magnetic material?

1. (A) Brass ✓
2. (B) Iron
3. (C) Cobalt
4. (D) Nickel

11. The three common magnetic materials are:

1. (A) aluminium, copper and nickel
2. (B) iron, nickel and cobalt ✓
3. (C) copper, brass and glass
4. (D) wood, plastic and iron

12. The rock discovered by the Greeks which could attract iron is called:

1. (A) marble
2. (B) limestone
3. (C) lodestone ✓
4. (D) granite

13. A freely suspended piece of lodestone always settles in the:

1. (A) north-south direction ✓
2. (B) east-west direction
3. (C) vertical direction
4. (D) north-east direction

14. The property of the lodestone led to the invention of the:

1. (A) barometer
2. (B) compass ✓
3. (C) telescope
4. (D) microscope

15. Iron filings placed on a card above a magnet are attracted even without contact. This shows that magnets can attract objects:

1. (A) only in water
2. (B) only when heated
3. (C) without direct contact ✓
4. (D) only by touching them

16. A freely suspended bar magnet comes to rest pointing in the:

1. (A) any direction
2. (B) north-south direction ✓
3. (C) east-west direction
4. (D) up-down direction

17. The end of a suspended magnet that points north is called the:

1. (A) domain
2. (B) north magnetic pole ✓
3. (C) south magnetic pole
4. (D) neutral point

18. Two north poles of two bar magnets placed near each other will:

1. (A) have no effect
2. (B) become south poles
3. (C) repel each other ✓
4. (D) attract each other

19. The north pole of one magnet and the south pole of another magnet:

1. (A) do nothing
2. (B) attract each other ✓
3. (C) repel each other
4. (D) cancel each other

20. Like poles ______ and unlike poles ______.

1. (A) repel; repel
2. (B) repel; attract ✓
3. (C) attract; repel
4. (D) attract; attract