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Class 12 Physics (Part I) Chapter 5 Magnetism And Matter Quiz 8 (25 MCQs)

Quiz Instructions

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1. What is the difference between a solenoid and a toroid?

Correct Answer: B) A solenoid is a straight coil, while a toroid is a circular coil.

2. Electric field at a point varies as r$^\circ$ for-

Correct Answer: C) A plane infinite sheet of charge.

3. Soft iron is used in transformer cores

Correct Answer: A) True.

4. The angle of dip at a certain place where the horizontal and vertical components of the earth's magnetic field are equal is

Correct Answer: D) 45$^\circ$.

5. If a transformer reduces voltage, it is called a ..... transformer.

Correct Answer: D) Step down.

6. According to the dynamo effect,

Correct Answer: C) Magnetism of the Earth is due to electrical currents produced by convection motion of metallic fluids.

7. The area of M-H loop for soft iron, as compared to that for steel is:-

Correct Answer: B) Less.

8. Which of the following is correct about a magnetic monopole?

Correct Answer: B) Magnetic monopole does not exist.

9. How does temperature affect the magnetism of materials?

Correct Answer: B) Temperature affects magnetism by decreasing it in ferromagnetic materials as it increases, and enhancing it in some materials at low temperatures.

10. How do electromagnets differ from permanent magnets?

Correct Answer: B) Electromagnets can be turned on and off, while permanent magnets have a constant magnetic field.

11. S.I. unit of flux is:

Correct Answer: B) Weber.

12. Name the property of substance which shows how easily the substance can be magnetised when placed in the magnetising field

Correct Answer: B) Magnetic susceptibilty.

13. A magnet is the strongest at its .....

Correct Answer: C) Poles.

14. The relative permeability of free space is

Correct Answer: B) One.

15. ..... is defined as the magnetic moment associated with an electron due to its orbital motion in the first orbit of hydrogen atom.

Correct Answer: C) Bohr magneton.

16. The permanent magnetic material is characterised by:-

Correct Answer: B) Broad hysteresis loop.

17. The Earth's magnetic field acts in the direction of:

Correct Answer: D) Geographic equator.

18. At the same place, the horizontal component of earth's magnetic field is 0.40G and the angle of dip is 30$^\circ$. What is the resultant magnetic field?

Correct Answer: A) 0.46G.

19. Capacitor is a device use to store energy. Therefore a solar cell is a type of capacitor.

Correct Answer: B) False.

20. Which of the following is most suitable for the core of an electro magnet?

Correct Answer: A) Soft iron.

21. In a permanent magnet at room temperature [NCERT Exemplar](a) magnetic moment of each molecule is zero.(b) the individual molecules have non-zero magnetic moment which are all perfectly aligned.(c) domains are partially aligned.(d) domains are all perfectly aligned. Explaination:At room temperature, the permanent magnet retains ferromagnetic property for a long period of time.

Correct Answer: C) C.

22. The ratio of magnetic fields due to a small bar magnet in the end on position to the broad side on position is

Correct Answer: B) 1:2.

23. The magnetic lines of force inside a bar magnet:

Correct Answer: C) Are from N-pole to S-pole of the magnet.

24. The direction of magnetic dipole moment is always from

Correct Answer: A) North pole to south pole.

25. Electric current passing through a wire produces .....

Correct Answer: B) Magnetic field around wire.

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