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Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 9 (25 MCQs)

Quiz Instructions

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1. What is an example of a permanent magnet?

Correct Answer: C) Refrigerator magnet.

2. At present, north magnetic pole is located at a:

Correct Answer: A) Latitude of 79.74$^\circ$ N and a longitude of 71.8$^\circ$ W.

3. What is the significance of the Curie temperature?

Correct Answer: B) The Curie temperature signifies the transition point where a ferromagnetic material becomes paramagnetic.

4. A bar magnet AB with magnetic moment M is cut into two equal parts perpendicular to its axis. One part is kept over the another so that B is exactly over A. What will me the magnetic moment of the combination so formed?

Correct Answer: C) M.

5. The larger the number of field lines crossing per unit area, the Weaker is the magnitude of the magnetic field.

Correct Answer: B) False.

6. A proton moves 10 cm on a path in the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the proton by the electrical field?

Correct Answer: A) 4.8 x 10$^{-20}$ J.

7. Hysteresis loss is minimized by using

Correct Answer: D) Metal.

8. The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is:

Correct Answer: A) Zero.

9. A charged capacitor act like

Correct Answer: A) A DC open.

10. Which of the following cannot be magnetised by a magnet?

Correct Answer: C) Copper nail.

11. MAGNETIC MOMENT FOR BOHR MAGNETRON IS

Correct Answer: B) QVR/2.

12. The pole strength of a magnet depends on its:

Correct Answer: D) All of the above.

13. Dimensional formula of magnetic permeability

Correct Answer: C) MLT$^{-2}$A$^{-2}$.

14. If a diamagnetic material is placed in a magnetic field, the magnetic field inside the material compared to that outside will be

Correct Answer: A) Slightly less.

15. S is the surface of a lump of magnetic material.(a) Lines of B are not necessarily continuous across S.(b) Some lines of B must be discontinuous across S.(c) Lines of H are necessarily continuous across S.(d) Lines of H cannot all be continuous across S.

Correct Answer: D) D.

16. Susceptibility is positive and large for a

Correct Answer: B) Ferromagnetic substance.

17. Q2 What is unit of H?

Correct Answer: C) A/m.

18. In what layer of Earth is the magnetic field generated?

Correct Answer: B) Outer Core.

19. What is a reversible change in matter? Give an example.

Correct Answer: B) A change that can be reversed, like melting ice into water.

20. How do magnetic fields influence the behavior of electrons in atoms?

Correct Answer: C) Magnetic fields influence electrons by altering their trajectories and energy levels, affecting their spins and leading to phenomena like Zeeman splitting.

21. Gauss law for magnetism is

Correct Answer: C) The net magnetic flux through any closed surface is zero.

22. Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator(a) is always zero.(b) can be zero at specific points.(c) cannot be positive or negative.(d) is not bounded.Explaination:As the angle of dip at a point on the geographical equator is bounded in a range from positive to negative value.

Correct Answer: B) B.

23. What is an irreversible change? Give an example.

Correct Answer: B) A change that cannot be reversed, like burning paper.

24. For making electromagnets, steel is preferred over soft iron as it has high retentivity as well as high coercivity

Correct Answer: B) False.

25. How do magnetic fields affect charged particles?

Correct Answer: A) Magnetic fields cause charged particles to move in circular or helical paths.

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