# MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter with Answers

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## Magnetism and Matter Class 12 MCQs Questions with Answers

Solve these Magnetism and Matter Multiple Choice Questions of Class 12 Physics Chapter 5 MCQ, so as not to miss out on any concept from being clear about what they mean!

Question 1.
In a permanent magnet at room temperature
(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.

Answer: (c) domains are partially aligned.

Question 2.
Two magnets of equal mass are joined at right angles to each other as shown that magnet 1 has a magnetic moment 3 times that of magnet 2. This arrangement is pivoted so that it is free to rotate in the horizontal plane. In equilibrium what angle will the magnet 1 subtend with the magnetic meridian?

(a) tan-1 ($$\frac { 1 }{2}$$)
(b) tan-1 ($$\frac { 1 }{3}$$)
(c) tan-1(1)
(d) 0°

Answer: (b) tan-1 ($$\frac { 1 }{3}$$)

Question 3.
The ratio of the area of B-H curve and l-H curve of a substance in M.K.S. system is
(a) µ$$_{0}^{2}$$
(b) $$\frac { 1 }{µ_0^2}$$
(c) µ0
(d) $$\frac { 1 }{µ_0}$$

Question 4.
The magnetic susceptibility is negative for:
(a) diamagnetic material only
(b) paramagnetic material only
(c) ferromagnetic material only
(d) paramagnetic and ferromagnetic materials

Question 5.
Hysteresis loops for two magnetic materials A and B are given below. These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:

(a) A for electric generators and transformers.
(b) A for electromagnets and B for electric generators
(c) A for transformers and B for electric generators
(d) B for electromagnets and transformers

Answer: (d) B for electromagnets and transformers

Question 6.
An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be
(a) M
(b) $$\frac { 2M }{π}$$
(c) $$\frac { M }{π}$$
(d) Mπ

Answer: (b) $$\frac { 2M }{π}$$

II. Fill in the blanks

Question 1.
The magnetic field strength at a point due to a short bar magnet on its axis varies ………………… as cube of distance of the point from the centre of magnet.

Question 2.
……………….. is a vertical plane passing through the magnetic North and South Poles of the earth.

Question 3.
………………. is a vertical plane passing through the geographic North and South Poles.

Question 4.
………………. at a place is defined as the acute angle between the magnetic meridian and the geographic meridian.

Question 5.
Lines drawn up on a magnetic map through places that have the same declination are called ……………… lines.

Question 6.
……………. at a place is defined as the angle between the direction of total intensity of the earth’s magnetic field and a horizontal line in the magnetic meridian at that place.

Question 7.
Lines drawn up on a magnetic map through places, which have the same dip, are called ………………. lines.

Question 8.
The degree to which the magnetic field can penetrate or permeate a medium is called its magnetic ………………

Question 9.
For paramagnetic materials, magnetic susceptibility is related with temperature as inversely proportional to ………………..

Question 10.
There is no effect of temperature on ……………… type of materials.

Question 11.
The ability of a material to retain magnetism after removal of magnetising field is called ………………