12th Physics Question

Class 12th Physics Chapter 5 Magnetism & Matter VVI Objective Question

Magnetism And Matter

1. SI unit of magnetic flux is : 

(A) Ohm 

(B) Weber

(C) Tesla 

(D) None of these

Answer:- B

2. Copper is

(A) Paramagnetic

(B) Ferromagnetic 

(C) Diamagnetic

(D) Semi-conductor

Answer:- C

3. Which of the following has greater susceptibility ? 

(A) Paramagnetic

(B) Diamagnetic 

(C) Ferromagnetic

(D) Semi-conductor

Answer:- A

4. If a magnet is kept in magnetic meridian with its North pole pointing north, then number of neutral points will be :

(A) 1 

(B) 2

(C) 3 

(D) None of these

Answer:- B

5. Which is more appropriate material for a strong electromagnet?

(A) air 

(B) soft iron

(C) steel 

(D) alloy of copper and nickel 

Answer:- B

6. Liquid and gases are 

(A) ferromagnetic

(B) diamagnetic

(C) paramagnetic

(D) behave magnetically like a vacuum 

Answer:- A

7. Which of the following materials has magnetic susceptibility negative and less than 1 in value ?

(A) ferromagnetic

(B) paramagnetic

(C) diamagnetic 

(D) None of these

Answer:- C

8. The magnetic susceptibility of paramagnetic substances is 

(A) constant 

(B) zero

(C) infinity 

(D) dependent upon magnetic field

Answer:- A

9. Nickel is 

(A) diamagnetic

(B) paramagnetic

(C) ferromagnetic

(D) None of these 

Answer:- B

10. The distance between the two poles of a magnet is called 

(A) magnetic length

(B) magnetic field 

(C) magnetic axis

(D) magnetic moment

Answer:- A

11. A magnet needle placed in a non-uniform magnetic field can experience

(A) a force and a torque

(B) a force but not a torque

(C) a torque but not a force

(D) None of these 

Answer:- A

12. The source of magnetism of a magnet is 

(A) spin of electron

(B) cosmic rays

(C) presence of a big magnet inside the Earth

(D) the earth 

Answer:- A

13. Which should be small for a permanent magnet ? 

(A) retentivity 

(B) coercivity

(C) both (A) and (B)

(D) None of these

Answer:- D

14. Iron is ferromagnetic 

(A) at all temperature

(B) at NTP only 

(C) above 770°C

(D) below 770°C

Answer:- D

15. The magnetic susceptibility of air is 

(A) positive 

(B) negative

(C) zero 

(D) positive or negative

Answer:- C

16. Which of the following is diamagnetic? 

(A) Na 

(B) Ca

(C) O2(STP)

(D) N2(STP) 

Answer:- D

17. The magnetic induction at a distance r from a single pole is inversely proportional to

(A) r

(B) r2

(C) 1 / r

(D) 1 / r2

Answer:- B

18. The work done in rotating a bar magnet of magnetic moment M in a magnetic field B by an angle θ from stable equilibrium is 

(A) MB sinθ

(B) MB cosθ

(C) MB (1 – cosθ)

(D) MB (1 – sinθ)

Answer:- C

19. The unit of magnetic potential is 

(A) J Am

(B) JA-1m-1

(C) JA-1m-2

(D) JA2m-2 

Answer:- B

20. The value of permeability of a vaccum is 

(A) 4π x 10-7 henry/meter

(B) 4π x 10-9 henry/meter

(C) 4π x 10-7 henry/meter

(D) 4π x 107 henry/meter 

Answer:- A

21. The value of dip at the pole of the earth is 

(A) 0°

(B) 90°

(C) 45°

(D) 180°

Answer:- B

22. A freely suspended needle at equator of the Earth 

(A) remains vertical

(B) is inclined at 45° 

(C) remains horizontal

(D) is inclined at 60°

Answer:- C

23. For making an electromagnet, core material should have 

(A) high magnetic susceptibility

(B) high magnetic retentivity 

(C) high hysteris area

(D) None of these

Answer:- A

24. A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment of either part is

(A) M

(B) M/2

(C) 2M

(D) Zero 

Answer:- B

25. Magnetic dipole moment is a vector quantity directed from: . 

(A) South to North Pole

(B) North to South Pole

(C) East to West direction 

(D) West to East direction

Answer:- A

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