Magnetism and Matter MCQs for NEET

1 At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 10^3-5 T and resultant magnetic field is 4 × 10^3-5 T. The angle of dip at this place is

A 30°

B 60°

C 90°

D 45°

View Answer

Answer:60°

2 The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component the value of angle of dip at this place is

A 30°

B 45°

C 60°

D 90°

View Answer

Answer:60°

3 A magnet of dipole moment M is aligned in equilibrium position in a magnetic field of intensity B. The work done to rotate it through an angle 0 with the magnetic field is

A MB sin θ

B MB cos θ

C MB (1 – cos θ)

D MB(l – sin θ)

View Answer

Answer:MB (1 – cos θ)

4 At a point on the right bisector of a magnetic dipole, the magnetic

A potential varies as 1/r²

B potential is zero at all points on the right bisector.

C field varies as r³.

D field is perpendicular to the axis of dipole.

View Answer

Answer:potential is zero at all points on the right bisector.

5 At a certain place on earth, B_H=

angle of dip at this place is

A 60°

B 30°

C 45°

D 90°

View Answer

Answer:60°

6 A diamagnetic material in a magnetic field moves

A perpendicular to the field.

B from weaker to stronger parts.

C from stronger to weaker parts.

D in random direction.

View Answer

Answer:from stronger to weaker parts.

7 In which type of material the magnetic susceptibility does not depend on temperature?

A Diamagnetic

B Paramagnetic

C Ferromagnetic

D Ferrite

View Answer

Answer:Diamagnetic

8 Domain formation is the necessary feature of

A diamagnetism

B Paramagnetis.

C ferromagnetism.

D all of these.

View Answer

Answer:ferromagnetism.

9 The best material for the ore of a transformer is

A stainless steel

B mild steel

C hard steel

D soft iron

View Answer

Answer:soft iron

10 The magnetic susceptibility of an ideal diamagnetic substance is

A +1

B 0

C -1

D ∞

View Answer

Answer:-1

11 A magnetic needle suspended parallel to a magnetic field requires /3 J of work to turn it through 60°. The torque needed to maintain the needle in this position will be

A 2√3 J

B 3 J

C √ J

D

View Answer

Answer:3 J

12 If the magnetising field on a ferromagnetic material is increased, its permeability.

A is decreased

B is increased

C is unaffected

D may be increased or decreased.

View Answer

Answer:is decreased

13 Lines of force, due to earth’s horizontal magnetic field, are

A elliptical

B curved lines

C concentric circles

D parallel and straight

View Answer

Answer:parallel and straight

14 Angle of dip is 90° at

A poles.

B equator.

C both at equator and poles.

D tropic of cancer.

View Answer

Answer:poles.

15 Curie law xT = constant, relating magnetic susceptibility (x) and absolute temperature (T) of magnetic substance is obeyed by

A all magnetic substances.

B paramagnetic substances.

C diamagnetic substances.

D ferromagnetic substances.

View Answer

Answer:paramagnetic substances.

16 The material suitable for making electromagnets should have

A high retentivity and high coercivity.

B low retentivity and low coercivity.

C high retentivity and low coercivity.

D low retentivity and high coercivity.

View Answer

Answer:high retentivity and low coercivity.

17 Curie temperature is the temperature above which

A a ferromagnetic material becomes paramagnetic.

B a ferromagnetic material becomes diamagnetic.

C a paramagnetic material becomes diamagnetic.

D a paramagnetic material becomes ferromagnetic.

View Answer

Answer:a ferromagnetic material becomes paramagnetic.

18 Three needles N₁ N₂ and N₃ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet, when brought close to them, will

A attract N₁ strongly, but repel N₂ and N₃ weakly.

B attract all three of them.

C attract N₁ and N₂ strongly but repel N₃.

D attract N₁ strongly, N₂ weakly and repel N₃ weakly.

View Answer

Answer:attract N₁ strongly, N₂ weakly and repel N₃ weakly.

19 A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to a magnet of the same size and magnetisation