NEET Physics Magnet and Its Properties and Magnetic Moment MCQs Set A

a)

b)

c)

d) None of these

Answer:

Question: On cutting a solenoid in half, the field lines remain ...A..., emerging from one face of the solenoid and entering into the other face. Here, A refers to

a) continuous

b) irregular

c) alternate

d) discontinuous

Answer: continuous

Question: The magnetism of magnet is due to

a) the spin motion of electron

b) cosmic rays

c) earth

d) pressure of big magnet inside the earth

Answer: the spin motion of electron

Question: For bar magnet effective length (L_e) related with geometrical length (L_g) as

a)

b)

c) Both

d) None of these

Answer:

Question:  A bar magnet of magnetic moment M, is placed in magnetic field of induction B. The torque exerted on it is

a)

b)

c)

d) None of these

Answer:

Question: The magnetic moment of a bar magnet is thus ...A... to the magnetic moment of an equivalent solenoid that produces the same magnetic field. Here, A refers to

a) equal

b) unequal

c) different

d) same

Answer: equal

Question: The pole strength of the magnet does not depend on

a) both

b) nature of material

c) area of cross-section

d) None of these

Answer:  both

Question: A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. Of the following physical quantities the one which remains unchanged is

a) None of these

b) intensity of magnetisation

c) magnetic moment

d) pole strength

Answer: None of these

Question: Current I is flowing in a coil of area A and number of turns is N, then magnetic moment of the coil in M equal to

a) NIA

b) NI/A

c) N² AI

d) None of these

Answer:  NIA

Question: Magnetic dipole moment is a vector quantity directed from

a) south pole to north pole

b) north pole to south pole

c) east to west

d) west to east

Answer: south pole to north pole

Question:  A curve between magnetic moment and temperature of  magnet is

a)

b)

c)

d) None of these

Answer:

Question: Magnetic lines of force due to a bar magnet do not intersect because

a) a point always has a single net magnetic field

b) the lines have similar charges and so repel each other

c) the lines always diverge from a single force

d) None of these

Answer: a point always has a single net magnetic field

Question: The magnetic lines of force inside a bar magnet

a) are from S-pole of magnet

b) depend upon the area of cross section of bar magnet

c) do not exist

d) are from N-pole to S-pole of magnet

Answer: are from S-pole of magnet

Question: A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the axis of the loop is in

a) end-on position

b) both

c) broadside-on position

d) None of these

Answer:  end-on position

Question: Assertion : We cannot think of magnetic field configuration with three poles.
Reason : A bar magnet does not exert a torque on itself due to its own field.

a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

b) Assertion is correct, reason is incorrect

c) Assertion is incorrect, reason is correct.

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer:  Assertion is correct, reason is correct; reason is not a correct explanation for assertion