PSEB / NCERT CLASS 12 PHYSICS ( CEP) CH. 4 AND 5 MCQS/ 2 MARKS / 3 MARKS QUESTIONS SOLVED

Class 12 Physics MCQ Quiz — Chapter 4 & Chapter 5

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Chapter 4 — Moving Charges and Magnetism (MCQs)

1) Who concluded that moving charges or currents produce a magnetic field?

a) J. C. Maxwell b) H. C. Oersted c) J. A. Fleming d) J. C. Bose

Correct answer: H. C. Oersted

2) When a magnetic compass needle is brought near a straight current-carrying wire: (I) The wire causes a noticeable deflection. (II) The needle aligns tangentially to a circle centered on the wire in a plane perpendicular to the wire.

a) (I) is correct b) (II) is correct c) Both (I) and (II) are correct d) Neither (I) nor (II) is correct

Correct answer: Both (I) and (II) are correct

3) The value of permeability of free space is:

a) 4π × 10⁻⁷ H·m⁻¹ b) 9 × 10⁹ N·m²·C⁻² c) 8.854 × 10⁻¹² F·m⁻¹ d) 3 × 10⁸ m·s⁻¹

Correct answer: 4π × 10⁻⁷ H·m⁻¹

4) An electron is projected with uniform velocity along the axis of a long current-carrying solenoid. Which is true?

a) It is accelerated along the axis b) It moves in a circle about the axis c) It experiences a force at 45° and moves helically d) It continues with uniform velocity along the axis

Correct answer: Continues with uniform velocity along the axis

5) If beams of electrons and protons move parallel in the same direction, they:

a) Attract each other b) Repel each other c) No relation d) Neither attracts nor repels

Correct answer: Attract each other

6) A rectangular current-carrying coil is placed in a non-uniform magnetic field. On the coil, the total:

a) force is non-zero b) force is zero c) torque is zero d) none of these

Correct answer: force is non-zero

7) Resistance of an ideal ammeter is:

a) Infinity b) 100 Ω c) Zero d) 1 Ω

Correct answer: Zero

8) A charged particle moves in gravity-free space without change in its velocity. Which is not possible?

a) E = 0, B = 0 b) E ≠ 0, B = 0 c) E = 0, B ≠ 0 d) E ≠ 0, B ≠ 0

Correct answer: E ≠ 0, B = 0

9) Assertion (A): A rectangular current loop in a uniform magnetic field has zero net force. Reason (R): The net torque on the loop is zero irrespective of orientation.

a) Both A and R true, and R is the correct explanation b) Both A and R true, but R is not the correct explanation c) A true, R false d) A false, R true e) Both A and R false

Correct answer: A true, R false

Chapter 5 — Magnetism and Matter (MCQs)

1) 1 Am is the pole strength of a pole which when placed at a distance of 1 m from an equal and opposite pole would attract it with a magnetic force of:

a) 10⁻⁷ N b) 2 × 10⁻⁷ N c) 9 × 10⁹ N d) 8.854 × 10⁻¹² N

Correct answer: 10⁻⁷ N

2) When the angle between the magnetic moment of a small compass needle and the uniform magnetic field is θ = 180°:

a) Torque is maximum b) Needle is in stable equilibrium c) Potential energy is zero d) Needle is in unstable equilibrium

Correct answer: Needle is in unstable equilibrium

3) Assertion (A): Magnetic field lines always form continuous closed loops, outside and inside the magnet. Reason (R): Isolated magnetic poles (monopoles) do not exist.

a) Both A and R true, and R is the correct explanation b) Both A and R true, but R is not the correct explanation c) A true, R false d) A false, R true e) Both A and R false

Correct answer: Both A and R true, and R explains A

4) The dimensional formula for magnetic intensity is:

a) [L A] b) [L⁻¹ A] c) [L A⁻¹] d) [L⁻¹ A⁻¹]

Correct answer: [L⁻¹ A]

5) If the magnetic susceptibility of a material is 100, its relative permeability is:

a) 100 b) 99 c) 101 d) 10

Correct answer: 101

6) For which one of the following substances is the magnetic susceptibility low and positive?

a) Bismuth b) Copper c) Iron d) Sodium

Correct answer: Sodium (paramagnetic: low, positive χ)

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