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NEET • PHYSICS • MAGNETISM AND MATTER

Magnetism and matter practice · Hard

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1 Hard

1 of 8

Understanding +4 | -1

Given below are three statements.

Statement-A : Every magnetic configuration
must have a north and a south
pole.

Statement-B : Net magnetic flux through any
closed surface is zero, but net
electric flux may not be zero.

Statement-C : Materials showing Meissner
effect have zero magnetic
susceptibility.

In light of the above statements, choose the
correct answer from the options given below.

View answer and explanation

Correct option: D

Only B is correct

Option D is correct. Only Statement-B is correct as magnetic monopoles do not exist, and Meissner effect materials have susceptibility of -1.

2 Hard

2 of 8

Application +4 | -1

A dip circle shows an apparent dip of

45^\circ

at a place where the true dip is

30^\circ

. If the dip circle is rotated through

90^\circ

, what apparent dip will it show:

View answer and explanation

Correct option: A

{\cot ^{ - 1}}\left( {\sqrt 2 } \right)

Option A (

{\cot ^{ - 1}}\left( {\sqrt 2 } \right)

) is correct because the apparent dip changes when the dip circle is rotated, and the new apparent dip can be calculated using the given formula.

3 Hard

3 of 8

Application +4 | -1

The magnetic needle of an oscillation magnetometer makes 10 oscillations per min under the action of earth’s magnetic field alone. When a bar magnet is placed at some distance along the axis of the needle, it makes 14 oscillations per min. If the bar magnet is turned so that its poles interchange their positions, then the new frequency of oscillation of the needle is

View answer and explanation

Correct option: B

\mathrm{vibs}

{\mathrm{m}^{ - 1}}

Option B (2

\mathrm{vibs}

{\mathrm{m}^{ - 1}}

) is correct because it involves calculating the resultant magnetic field and then the frequency after the magnet's poles are interchanged.

4 Hard

4 of 8

Application +4 | -1

A sample of cast iron exhibits a magnetic field

B=0.5 T,

when intensity of magnetizing field

(H)

10 \frac{\mathrm{A}}{\mathrm{m}}.

Relative permeability of iron is 

View answer and explanation

Correct option: C

\frac{125000}{\pi}

Option C (

\frac{125000}{\pi}

) is correct because the relative permeability is calculated using the formula

\mu_r = \frac{B}{\mu_0 H}

5 Hard

5 of 8

Understanding +4 | -1

Given below are two statement:

Statement-I: Susceptibilities of paramagnetic
substances incerase with decrease in temperature.

Statement-II: Diamagnetism is a result of orbital
motions of electrons developing magnetic
moments opposite to the applied magnetic field.

Choose the correct answer from the options given
below.

View answer and explanation

Correct option: A

Both Statement-I and Statement-II are true

Option A is correct. Paramagnetic susceptibility increases as temperature decreases, and diamagnetism arises from orbital motions opposing the applied field.

6 Hard

6 of 8

Application +4 | -1

Two bar magnets having same geometry with magnetic moments

M

and

2 M

are first placed in such a way that their similar poles are same side then its time period of oscillation is

T_1

. Now the polarity of one of the magnet is reversed then the time period of oscillation is

T_2

, so

View answer and explanation

Correct option: A

T_1 < T_2

Option A (

T_1 < T_2

) is correct because when similar poles are on the same side, the effective magnetic moment is higher, leading to a smaller time period.

7 Hard

7 of 8

Remembering +4 | -1

The presence of magnetic field can be
determined using which one of the following
instruments?

View answer and explanation

Correct option: C

Magnetic needle

Option C is correct. A magnetic needle (compass) aligns itself with the magnetic field lines, indicating the presence and direction of a magnetic field.

8 Hard

8 of 8

Application +4 | -1

A vibration magnetometer placed in magnetic meridian has small bar magnet. The magnet executes oscillations with a time period of

2 \, \mathrm{sec}

in earth's horizontal magnetic field of

36 \, \mu \mathrm{T}

. When a horizontal magnetic field '

B

' is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet is

6 \, \mathrm{sec}

. Then value of '

{B}

' is:

View answer and explanation

Correct option: D

32 \mu \mathrm{T}

Option D (

32 \mu \mathrm{T}

) is correct because it involves calculating the magnetic field produced by the wire using the time periods of oscillation.

Revision notes and key takeaways

Review MAGNETISM AND MATTER in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 8 single-correct-answer MCQs on MAGNETISM AND MATTER.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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