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Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 3 (25 MCQs)

Quiz Instructions

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1. A sensitive magnetic instrument can be shielded very effectively from outside fields by placing it inside a box of

Correct Answer: C) Soft iron of high permeability.

2. Lines of force, due to earth's horizontal magnetic field, are

Correct Answer: D) Parallel and straight.

3. Gemma is trying to separate a mixture of sand and rocks. What statement is true about separating this mixture?

Correct Answer: B) She can use a sieve to separate the mixture-to prove it is a physical change.

4. If susceptibility is negative, then nature of material is

Correct Answer: C) Diamagnetic.

5. Where on the surface of Earth is the vertical component of Earth's magnetic field zero?

Correct Answer: C) At Equator.

6. A magnetic needle suspended parallel to a magnetic field requires root 3 J of work to turn it through 60$^\circ$. The torque needed to maintain the needle in this position will be

Correct Answer: C) 3J.

7. What happens to a magnet's magnetic field if you cut the magnet in half?

Correct Answer: B) Each half becomes a new magnet with its own North and South poles.

8. A paramagnetic sample shows a net magnetisation of 8 Am-1 when placed in an external magnetic field of 0.6 T at a temperature of 4K. When the same sample is placed in an external magnetic field of 0.2 T at a temperature of 16 K, the magnetisation will be [NCERT Exemplar](a) 32/3 Am-1(b) 2/3 Am-1(c) 6 Am-1(d) 2.4 Am-1

Correct Answer: B) B.

9. When does a magnetic dipole possess maximum potential energy inside a magnetic field?

Correct Answer: A) Magnetic moment and magnetic field are antiparallel.

10. A magnetic needle is kept in a non-uniform magnetic field. It experiences

Correct Answer: C) A force and a torque.

11. How can you visualize a magnetic field?

Correct Answer: A) Use iron filings or a magnetic field sensor to visualize a magnetic field.

12. Which of the following is not a basic property of magnets.

Correct Answer: A) Magnet exists as a monopole.

13. For a diamagnetic substance, the magnetic dipole moment of each of its constituent atom is zero

Correct Answer: A) True.

14. Angle of dip is maximum at-

Correct Answer: A) Pole.

15. Tangent law is applicable only when:

Correct Answer: A) Two uniform and mutually perpendicular magnetic fields exist.

16. How does the Earth's magnetic field protect us from solar winds?

Correct Answer: A) The Earth's magnetic field deflects solar winds, protecting the atmosphere and surface from harmful charged particles.

17. The magnetic moment of an electron revolving in a circular orbit is given by:

Correct Answer: D) $\frac{evr}{2}$.

18. If a magnet is cut perpendicular its length into equal parts, then the pole strength of each pole of the magnet

Correct Answer: B) Remains same.

19. Energy per unit charge

Correct Answer: D) Voltage.

20. When a magnetic material is subjected to a very small magnetising force H. The intensity of magnetisation is proportional to:

Correct Answer: B) (b)$^{ H}$.

21. The magnetic field lines around a wire carrying a current form a series of concentric circles around the wire

Correct Answer: A) True.

22. The S.I. Unit of magnetic pole strength is

Correct Answer: A) Ampere/metre.

23. What is the relationship between electricity and magnetism?

Correct Answer: C) Electricity and magnetism are interconnected; electric currents produce magnetic fields, and changing magnetic fields can generate electric currents.

24. The earth behaves as a magnet with magnetic field pointing approximately from the geographic

Correct Answer: B) South to North.

25. How is the capacitance (C) of a parallel-plate capacitor affected by the charge on the plates?

Correct Answer: C) C does not depend on the charge on the plates.

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