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Magnetism and Matter — NEET & JEE MCQs with answers
This chapter examines magnetism at the material level: the bar magnet and its analogy with the electric dipole, Gauss's law for magnetism (no magnetic monopoles), magnetisation and magnetic intensity, and the classification of materials as diamagnetic, paramagnetic or ferromagnetic based on their magnetic susceptibility and response to an external field.
Topics in this chapter
- 5.1 Introduction
- 5.2 The Bar Magnet
- 5.3 Magnetism and Gauss's Law
- 5.4 Magnetisation and Magnetic Intensity
- 5.5 Magnetic Properties of Materials
Free practice questions
The net magnetic flux through any closed surface is zero because:
- A. magnetic fields are always weak
- B. magnetic field lines are straight
- C. isolated magnetic monopoles do not exist
- D. magnetic charge is quantised
Show answer
Answer: C — Zero net magnetic flux reflects that isolated magnetic poles (monopoles) do not exist; there are no sources or sinks of B, unlike electric charges which act as sources/sinks of E.
NCERT Class 12 Physics Ch 5
The NET force on a bar magnet placed in a UNIFORM external magnetic field is:
- A. zero
- B. $mB$
- C. $mB\sin\theta$
- D. $2mB$
Show answer
Answer: A — NCERT summary 2(a): the net force on a dipole in a uniform field is zero (only a torque acts).
NCERT Class 12 Physics Ch 5
A linear magnetic sample of susceptibility $\chi=0.02$ is placed where $H=1\,500$ A m$^{-1}$. Its magnetisation $M$ is:
- A. $30$ A m$^{-1}$
- B. $7.5\times10^{4}$ A m$^{-1}$
- C. $1500.02$ A m$^{-1}$
- D. $0$ A m$^{-1}$
Show answer
Answer: A — $M=\chi H=0.02\times1\,500=30$ A m$^{-1}$.
NCERT Class 12 Physics Ch 5
In a diamagnetic substance, the resultant magnetic moment of an atom is:
- A. Aligned permanently with any field
- B. Zero
- C. Very large
- D. Small but non-zero
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Answer: B — In a diamagnetic atom the orbital magnetic moments cancel, so the resultant atomic magnetic moment is zero.
NCERT Class 12 Physics Ch 5
Out of which materials is it possible to make magnets, according to the introduction?
- A. Aluminium and its alloys
- B. Gold and its alloys
- C. Iron and its alloys
- D. Copper and its alloys
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Answer: C — It is possible to make magnets out of iron and its alloys.
NCERT Class 12 Physics Ch 5
The maximum possible torque on a dipole $m$ in field $B$ has magnitude:
- A. $mB/2$
- B. $0$
- C. $2mB$
- D. $mB$
Show answer
Answer: D — At $\theta=90^\circ$, $\tau_{max}=mB\sin90^\circ=mB$.
NCERT Class 12 Physics Ch 5
Susceptibility $\chi$ measures how a material:
- A. conducts electric current
- B. responds to an external magnetic field
- C. stores electric charge
- D. radiates heat
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Answer: B — NCERT: $\chi$ is a measure of how a magnetic material responds to an external field.
NCERT Class 12 Physics Ch 5
Which of the following is a paramagnetic material?
- A. Bismuth
- B. Aluminium
- C. Copper
- D. Nickel
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Answer: B — Aluminium is listed among paramagnetic materials (aluminium, sodium, calcium, oxygen at STP, copper chloride).
NCERT Class 12 Physics Ch 5
Magnetic field lines are:
- A. always straight lines
- B. open curves ending at infinity
- C. continuous, forming closed loops
- D. discontinuous, starting on charges
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Answer: C — Magnetic field lines are continuous and form closed loops; they have no beginning or end.
NCERT Class 12 Physics Ch 5
A student claims: "We can isolate a single north pole of a magnet." Based on the introduction, this claim is:
- A. True, because magnets are made of iron
- B. True, by breaking the magnet repeatedly
- C. False, because isolated magnetic monopoles do not exist
- D. False, because magnets have no poles
Show answer
Answer: C — The text states we cannot isolate the north or south pole of a magnet; isolated magnetic monopoles do not exist. Hence the claim is false.
NCERT Class 12 Physics Ch 5
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