Chapter Exam

Chapter-5 Magnetism and Matter — Online MCQ Test

Q: What is the SI unit of magnetic dipole moment?

Answer: A. A·m² — The magnetic dipole moment is measured in Ampere-meter squared (A·m²), which represents the product of current and area.

Q: Which of the following materials is diamagnetic?

Answer: C. Copper — Copper is diamagnetic as it has no unpaired electrons and opposes external magnetic fields; iron, cobalt, and nickel are ferromagnetic.

Q: A paramagnetic material has magnetic susceptibility (χ):

Answer: B. χ ≈ 10⁻⁵ to 10⁻³ (small and positive) — Paramagnetic materials have small positive magnetic susceptibility (χ ≈ 10⁻⁵ to 10⁻³), indicating weak attraction to magnetic fields.

Q: Compare the magnetic susceptibility values: If χ₁ is for aluminum (paramagnetic), χ₂ for bismuth (diamagnetic), and χ₃ for iron (ferromagnetic), then the correct order is:

Answer: B. χ₃ > χ₁ > χ₂ — Iron (ferromagnetic, χ₃ >> 1) > Aluminum (paramagnetic, χ₁ ≈ 10⁻⁵) > Bismuth (diamagnetic, χ₂ ≈ -10⁻⁵). Ferromagnetic > Paramagnetic > Diamagnetic.

Q: The relationship between magnetic field B, permeability μ, and magnetization M in a material is B = μ₀(H + M). When a ferromagnetic material is magnetized near saturation, M becomes:

Answer: A. Very large compared to H, making B ≈ μ₀M — Near saturation of a ferromagnetic material, magnetization M becomes very large (as all domains align), so M >> H and B ≈ μ₀M dominates the expression.

PHYSICS · Grade 12 · CBSE(NCERT)

Practice Chapter-5 Magnetism and Matter with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 12 PHYSICS. This chapter covers: bar magnet - magnetic field lines - Earth's magnetism - paramagnetic - diamagnetic - ferromagnetic materials. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-5 Magnetism and Matter — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 12 PHYSICS — Chapter-5 Magnetism and Matter, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of magnetic dipole moment?

A. A·m² ✓
B. T·m
C. Wb/m
D. H/m

Answer: A. A·m²
The magnetic dipole moment is measured in Ampere-meter squared (A·m²), which represents the product of current and area.

Which of the following materials is diamagnetic?

A. Iron
B. Cobalt
C. Copper ✓
D. Nickel

Answer: C. Copper
Copper is diamagnetic as it has no unpaired electrons and opposes external magnetic fields; iron, cobalt, and nickel are ferromagnetic.

A paramagnetic material has magnetic susceptibility (χ):

A. χ > 1 (positive and large)
B. χ ≈ 10⁻⁵ to 10⁻³ (small and positive) ✓
C. χ ≈ -10⁻⁶ to -10⁻⁵ (small and negative)
D. χ = 0

Answer: B. χ ≈ 10⁻⁵ to 10⁻³ (small and positive)
Paramagnetic materials have small positive magnetic susceptibility (χ ≈ 10⁻⁵ to 10⁻³), indicating weak attraction to magnetic fields.

Compare the magnetic susceptibility values: If χ₁ is for aluminum (paramagnetic), χ₂ for bismuth (diamagnetic), and χ₃ for iron (ferromagnetic), then the correct order is:

A. χ₂ > χ₁ > χ₃
B. χ₃ > χ₁ > χ₂ ✓
C. χ₁ > χ₃ > χ₂
D. χ₂ > χ₃ > χ₁

Answer: B. χ₃ > χ₁ > χ₂
Iron (ferromagnetic, χ₃ >> 1) > Aluminum (paramagnetic, χ₁ ≈ 10⁻⁵) > Bismuth (diamagnetic, χ₂ ≈ -10⁻⁵). Ferromagnetic > Paramagnetic > Diamagnetic.

The relationship between magnetic field B, permeability μ, and magnetization M in a material is B = μ₀(H + M). When a ferromagnetic material is magnetized near saturation, M becomes:

A. Very large compared to H, making B ≈ μ₀M ✓
B. Zero, making B = μ₀H
C. Negative
D. Equal to H

Answer: A. Very large compared to H, making B ≈ μ₀M
Near saturation of a ferromagnetic material, magnetization M becomes very large (as all domains align), so M >> H and B ≈ μ₀M dominates the expression.