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Magnetism and Matter Set-2 MCQ Online Practice Test | Class 12 | Quiz Tweek

Magnetism and Matter Set-2

Practice Important MCQs for Magnetism and Matter — Physics, Class 12.

The chapter "Magnetism and Matter" is a cornerstone of the Class 12 Physics curriculum, bridging the gap between moving charges and the intrinsic magnetic properties of materials. For the CBSE Board Exams, this chapter carries significant weight as it explores the fundamental behavior of magnetic dipoles, Earth’s magnetic field, and the classification of materials based on their magnetic response. Understanding these concepts is crucial for mastering both theoretical questions and numerical problems related to magnetic flux and field components.

In the latest 2024-25 syllabus, the focus remains on the qualitative and quantitative aspects of magnetic field lines, Gauss's Law in magnetism, and the distinctive characteristics of diamagnetic, paramagnetic, and ferromagnetic substances. This practice set is meticulously designed to align with the NCERT framework, ensuring students are well-prepared for both MCQ sections and conceptual reasoning required in the board examinations.

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Q1. The net magnetic flux through any closed surface is always:

(A)

Positive

(B)

Negative

(C)

Zero

(D)

Dependent on the medium

Q2. A bar magnet of magnetic moment $M$ is cut into two equal parts parallel to its length. The magnetic moment of each part will be:

(A)

$M$

(B)

$M/2$

(C)

$M/4$

(D)

$2M$

Q3. The angle of dip at the magnetic equator of the Earth is:

(A)

$0^\circ$

(B)

$45^\circ$

(C)

$90^\circ$

(D)

$180^\circ$

Q4. Which of the following materials has a negative magnetic susceptibility ( $\chi$ )?

(A)

Aluminum

(B)

Copper

(C)

Iron

(D)

Nickel

Q5. The SI unit of magnetic pole strength is:

(A)

$A \cdot m$

(B)

$A/m$

(C)

$A \cdot m^2$

(D)

$T \cdot m/A$

Q6. If the horizontal and vertical components of Earth's magnetic field are equal, the angle of dip at that place is:

(A)

$30^\circ$

(B)

$45^\circ$

(C)

$60^\circ$

(D)

$90^\circ$

Q7. According to Curie’s law, the magnetic susceptibility of a paramagnetic material is proportional to:

(A)

$T$

(B)

$1/T$

(C)

$T^2$

(D)

$1/T^2$

Q8. Magnetic field lines:

(A)

Intersect at the poles

(B)

Form closed loops

(C)

Are only present inside the magnet

(D)

Start from the South pole and end at the North pole outside the magnet

Q9. A solenoid of $1000$ turns per meter has a core with relative permeability $\mu_r = 500$ . If a current of $2 A$ flows through it, the magnetic field $B$ inside the core is:

(A)

$0.4\pi \, T$

(B)

$4\pi \times 10^{-2} \, T$

(C)

$0.2\pi \, T$

(D)

$4\pi \times 10^{-4} \, T$

Q10. The work done in rotating a magnetic dipole of moment $M$ in a uniform magnetic field $B$ from its stable equilibrium position to unstable equilibrium position is:

(A)

$MB$

(B)

$2MB$

(C)

Zero

(D)

$-MB$

Q11. Which property is NOT possessed by magnetic field lines?

(A)

They are crowded near poles.

(B)

They can intersect if the field is non-uniform.

(C)

The tangent at any point gives the direction of $B$ .

(D)

They represent the direction of force on a North pole.

Q12. If a diamagnetic substance is brought near the north or south pole of a bar magnet, it is:

(A)

Attracted by both

(B)

Repelled by both

(C)

Attracted by North and repelled by South

(D)

Unaffected

Q13. The value of relative permeability ( $\mu_r$ ) for a vacuum is:

(A)

$0$

(B)

$1$

(C)

$4\pi \times 10^{-7}$

(D)

$\infty$

Q14. At the magnetic poles of the Earth, the horizontal component of the magnetic field ( $B_H$ ) is:

(A)

Maximum

(B)

Minimum but non-zero

(C)

Zero

(D)

Equal to the total field

Q15. The relation between magnetic permeability $\mu$ and susceptibility $\chi$ is:

(A)

$\mu = \mu_0 (1 + \chi)$

(B)

$\chi = \mu_0 (1 + \mu)$

(C)

$\mu_r = 1 - \chi$

(D)

$\mu = \mu_0 / (1 + \chi)$

...and 15 more challenging questions available in the interactive simulator.

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