🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books

Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 4 (25 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. The ratio of magnetic length to geometric length of a magnet is

Correct Answer: D) 0.84.

2. Angle of dip is 90$^\circ$ at

Correct Answer: B) Poles.

3. A ferromagnetic material is heated above its curie temperature. Which one is a correct statement?

Correct Answer: C) Ferromagnetic domains become random.

4. What is the right-hand rule in relation to magnetic fields?

Correct Answer: D) The right-hand rule helps visualize the direction of magnetic fields around conductors.

5. The correct relation between Bohr magneton and orbital magnetic moment is given by:

Correct Answer: B) Bohr magneton = minimum value of orbital magnetic moment.

6. The gyromagnetic ratio of an electron of charge e and mass m is equal to-

Correct Answer: D) E / 2m.

7. Sour Taste:Chemical or Physical Property

Correct Answer: B) Physical Property.

8. A large magnet is broken into two pieces so that the lengths are in the ratio 2:1.the pole strength of the two pieces will have ratio

Correct Answer: D) 1:1.

9. Which of the following is not true about magnetic field lines?

Correct Answer: B) They go away from the south pole.

10. What is the effect of a magnetic field on a current-carrying conductor?

Correct Answer: C) A current-carrying conductor experiences a force when placed in a magnetic field.

11. What is the significance of the Curie temperature in magnetism?

Correct Answer: C) The Curie temperature marks the transition from ferromagnetism to paramagnetism in a material.

12. Which of the following are the Elements of Earth's magnetic fields?

Correct Answer: A) (i), (ii) and (iii).

13. A bar magnet of dipole moment 'm' cut into two equal pieces transverse to its length. Dipole moment of each part is

Correct Answer: B) M/2.

14. What happens when unlike poles of two magnets are brought together?

Correct Answer: B) They attract each other.

15. Magnetic succeptibility for diamagnets are

Correct Answer: C) Very small and negative.

16. For making permanent magnet, steel is preferred over soft iron as it has high retentivity as well as high coercivity.

Correct Answer: A) True.

17. The relative permeability of a substance x is slightly less than unity and that of substance y is slightly more than unity, then

Correct Answer: D) X is diamagnetic and y is paramagnetic.

18. Which of the following materials is NOT typically magnetic?

Correct Answer: C) Copper.

19. The strength of the earth's magnetic field is

Correct Answer: D) Vary from place to place on the earths surface.

20. The magnetic dipole moment of a current loop is independent of

Correct Answer: A) Magnetic field in which it is lying.

21. Relative permeability of a magnetic material is 0.5 the material is

Correct Answer: A) Diamagnetic.

22. What are the applications of superconductors in magnetism?

Correct Answer: D) Applications of superconductors in magnetism include MRI machines, particle accelerators, and maglev trains.

23. A current loop behaves as a system of ..... As a result, it acts like a magnetic dipole.

Correct Answer: B) Charges.

24. Angle of declination is the angle between

Correct Answer: B) Magnetic meridian and geographical meridian.

25. Equipotential surfaces

Correct Answer: A) Are closer in regions of large electric fields compared to regions of lower electric fields.

🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books