CBSE Class 12 Physics 2025 Sample Paper Solved Set 6

SECTION A

1 A point charge q is kept at a distance r from an infinitely long straight wire with charge density λ.
The magnitude of the electrostatic force experienced by charge q is
(a) Zero
(b) 𝑞𝜆/2𝜋𝜖₀ 𝑟
(c) 𝑞𝜆/4𝜋𝜖₀ 𝑟
(d) 𝑞𝜆/𝜖₀ 𝑟

Answer : b

3 Shape of equipotential surfaces in uniform electric field will be :
(a) Spherical normal to electric field
(b) Random
(c) Circular normal to electric field
(d) Equidistant Planes normal to electric field.

Answer : d

4 The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
(a) the resistance and the specific resistance, will both remain unchanged
(b) the resistance will be doubled and the specific resistance will be halved
(c) the resistance will be halved and the specific resistance will remain unchanged
(d) the resistance will be halved and the specific resistance will be doubled

Answer : c

5 Magnetic field lines inside an ideal solenoid are:
(a) Circular
(b) Straight and parallel
(c) Random
(d) Perpendicular to the axis

Answer : b

6 Identify the property which is not characteristic for a semiconductor?
(a) at a very low temperatures, it behaves like an insulator
(b) at higher temperatures two types of charge carriers will cause conductivity
(c) the charge carriers are electrons and holes in the valence band at higher temperatures
(d) the semiconductor is electrically neutral.

Answer : c

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