CBSE Class 12 Physics 2025 Sample Paper Set 03 Solved

Q1. Two parallel infinite line charges with linear charge density +ƛ C/m and –ƛ C/m are placed at a distance of 2R in free space. What is the electric field midway between the two line charges.
(a) Zero
(b) 2ƛ/ π Ɛ₀ R N/C
(c) ) ƛ/ π Ɛ₀ R N/C
(d) ƛ/ 2π Ɛ₀ R N/C

Answer : c

Q2. When a potential difference V is applied across a conductor at temperature T, the drift velocity of the electrons is proportional to
(a)T
(b) √T
(c) V
(d) √V

Answer : c

Q3. A circular loop of conducting wire of radius ҅a᾿ carries a steady current I. The ratio of magnitudes of the magnetic field at a point along its axis at distances ‘2a’ and ‘3a’ from its centre is
(a) 2:1
(b) 2√2:1
(c) √2: 1
(b) 3:√2

Answer : b

Q4. The voltage across a resistor, an inductor and a capacitor connected in series to an a..c. source are 20 V, 15 V and 30 V respectively. The resultant voltage in the circuit is
(a) 5 V
(b) 20 V
(c) 25 V
(d) 65 V

Answer : c

Q5. Correct match of column I with column II is

(a) 1-P, 2-R, 3-S, 4-Q
(b) 1-S, 2-P, 3-O, 4-R
(c) 1-Q, 2-P, 3-S, 4-R
(d) 1-S. 2-R, 3-P, 4-Q

Answer : b

Q6. The wavelength of an electromagnetic wave is 500 nm. It’s frequency in free space is-
(a)6 x 10¹⁴ Hz
(b) 3 x 10¹⁴ Hz
(c) 3 x 10¹² Hz
(d) 9 x 10¹² Hz

Answer : a

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