CBSE Class 12 Physics 2025 Sample Paper Solved Set 1

SECTION - A

1 The electric field at a point on the perpendicular bisector of a dipole is directed
(a) Along the dipole moment
(b) Perpendicular to the dipole moment
(c) Opposite to the dipole moment
(d) 45° to the dipole moment

Answer : c

2 A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor, then which of the following does not change ?
(a) Electric field between the plates
(c) Charge on the plates
(b) Potential difference across the plates
(d) Energy stored in the capacitor

Answer : c

3 Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
(a) 4:25
(b) 25:4
(c) 2:5
(d) 5:2

Answer : c

4. For a para magnetic material, the dependence of the magnetic susceptibility χ on the absolute temperature is given as
(a) χ ∝T
(b). χ ∝ 1/T2
(c). χ ∝1/T
(d) independent

Answer : c

5 In a series RLC circuit that is operating above the resonant frequency, the current
(a) Lags the applied voltage
(b) Leads the applied voltage
(c) Is in phase with the applied voltage
(d) Is zero

Answer : a

6 Two nuclei have mass numbers in the ratio 1: 2. What is the ratio of their B nuclear densities?
(a) 1:2
(b) 2:1
(c) 1:1
(d) 4:1

Answer : c

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