CBSE Class 12 Physics 2025 question paper (55/1)

1. A.
   $q_2 < q_3 < q_1$
2. B.
   $q_3 < q_1 < q_2$
3. C.
   $q_1 < q_2 < q_3$
4. D.
   $q_2 < q_1 < q_3$

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1. A.
   R
2. B.
   $\frac{R}{2}$
3. C.
   $\frac{R}{8}$
4. D.
   2R

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1. A.
   $(2\hat{j} + 3\hat{k})$ mN
2. B.
   $(-3\hat{j} + 2\hat{k})$ $\mu$N
3. C.
   $(6\hat{j} + 4\hat{k})$ mN
4. D.
   $(-4\hat{j} + 6\hat{k})$ $\mu$N

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1. A.
   3.0 mC
2. B.
   0.30 C
3. C.
   0.45 C
4. D.
   1.5 C

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1. A.
   2592
2. B.
   2866
3. C.
   2976
4. D.
   3140

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1. A.
   Zero
2. B.
   $i_0 v_0 \cos \phi$
3. C.
   $\frac{i_0 v_0}{2}$
4. D.
   $\frac{i_0 v_0}{2} \cos \phi$

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1. A.
   X-rays, microwaves, UV radiation
2. B.
   X-rays, UV radiation, microwaves
3. C.
   UV radiation, microwaves, X-rays
4. D.
   Microwaves, UV radiation, X-rays

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1. A.
   $\frac{H}{4}$
2. B.
   $\frac{3H}{4}$
3. C.
   H
4. D.
   $\frac{4H}{3}$

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1. A.
   mh
2. B.
   $\frac{m}{h}$
3. C.
   $\frac{h}{m}$
4. D.
   $\frac{1}{mh}$

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1. A.
   $\lambda_d > \lambda_p > \lambda_e$
2. B.
   $\lambda_e > \lambda_p > \lambda_d$
3. C.
   $\lambda_p > \lambda_e > \lambda_d$
4. D.
   $\lambda_e = \lambda_p = \lambda_d$

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1. A.
2. B.
3. C.
4. D.

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1. A.
   the barrier height and the depletion layer width both increase.
2. B.
   the barrier height increases and the depletion layer width decreases.
3. C.
   the barrier height and the depletion layer width both decrease.
4. D.
   the barrier height decreases and the depletion layer width increases.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   5 $\mu$C
2. B.
   5 mC
3. C.
   25 mC
4. D.
   0.1 C

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1. A.
   Zero
2. B.
   5 mC
3. C.
   2.5 mC
4. D.
   5 $\mu$C

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1. A.
   $[\mathrm{M\,L^2\,T^{-3}\,A^{-2}}]$
2. B.
   $[\mathrm{M^0\,L^0\,T^{-1}\,A^0}]$
3. C.
   $[\mathrm{M^{-1}\,L^{-2}\,T^4\,A^2}]$
4. D.
   $[\mathrm{M^0\,L^0\,T\,A^0}]$

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1. A.
   $\frac{1}{2\sqrt{e}}$ mA
2. B.
   $\sqrt{e}$ mA
3. C.
   $\frac{1}{\sqrt{e}}$ mA
4. D.
   $\frac{1}{2e}$ mA

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1. A.
   5 mA
2. B.
   0.5 mA
3. C.
   2 mA
4. D.
   1 mA

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1. A.
   a vertical arrow pointing UP, crossed by an oblique line that rises to the right, with the ball at the UPPER-RIGHT end of that oblique line
2. B.
   a vertical arrow pointing UP, crossed by an oblique line that rises to the right, with the ball at the LOWER-LEFT end of that oblique line
3. C.
   a vertical arrow pointing DOWN, crossed by an oblique line that rises to the right, with the ball at the LOWER-LEFT end of that oblique line
4. D.
   a vertical arrow pointing DOWN, crossed by an oblique line that rises to the right, with the ball at the UPPER-RIGHT end of that oblique line

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1. A.
   For a convex mirror magnification is always negative.
2. B.
   For all virtual images formed by a mirror magnification is positive.
3. C.
   For a concave lens magnification is always positive.
4. D.
   For real and inverted images, magnification is always negative.

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1. A.
   f
2. B.
   2 f
3. C.
   $\frac{f}{2}$
4. D.
   $\frac{f}{4}$

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1. A.
   10 cm
2. B.
   12 cm
3. C.
   16 cm
4. D.
   20 cm

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1. A.
   $\mathrm{X_1 X_2}$
2. B.
   $\sqrt{\mathrm{X_1 + X_2}}$
3. C.
   $\sqrt{\mathrm{X_1 X_2}}$
4. D.
   $\sqrt{\frac{\mathrm{X_2}}{\mathrm{X_1}}}$

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1. A.
   A
2. B.
   B
3. C.
   C
4. D.
   D

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1. A.
   Using a wire of same radius and twice the length
2. B.
   Using a wire of same radius and half length
3. C.
   Using a wire of same length and twice the radius
4. D.
   Using a wire of same length and half the radius

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1. A.
   $(2\hat{j} + 3\hat{k})$ mN
2. B.
   $(-3\hat{j} + 2\hat{k})$ $\mu$N
3. C.
   $(6\hat{j} + 4\hat{k})$ mN
4. D.
   $(-4\hat{j} + 6\hat{k})$ $\mu$N

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1. A.
   $\frac{1}{2}$
2. B.
   1
3. C.
   2
4. D.
   4

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1. A.
   2592
2. B.
   2866
3. C.
   2976
4. D.
   3140

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1. A.
   Zero
2. B.
   $i_0 v_0 \cos \phi$
3. C.
   $\frac{i_0 v_0}{2}$
4. D.
   $\frac{i_0 v_0}{2} \cos \phi$

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1. A.
   Speed : Remains same; Wavelength : Decreases; Frequency : Remains same
2. B.
   Speed : Remains same; Wavelength : Decreases; Frequency : Increases
3. C.
   Speed : Increases; Wavelength : Increases; Frequency : Decreases
4. D.
   Speed : Remains same; Wavelength : Increases; Frequency : Remains same

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1. A.
   medium '1' and at an angle greater than $\sin^{-1}\left(\frac{v_1}{v_2}\right)$
2. B.
   medium '1' and at an angle greater than $\cos^{-1}\left(\frac{v_1}{v_2}\right)$
3. C.
   medium '2' and at an angle greater than $\sin^{-1}\left(\frac{v_1}{v_2}\right)$
4. D.
   medium '2' and at an angle greater than $\cos^{-1}\left(\frac{v_1}{v_2}\right)$

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1. A.
   $10^{16}$
2. B.
   $10^{24}$
3. C.
   $10^{10}$
4. D.
   $10^{20}$

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1. A.
2. B.
3. C.
4. D.

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1. A.
   the barrier height and the depletion layer width both increase.
2. B.
   the barrier height increases and the depletion layer width decreases.
3. C.
   the barrier height and the depletion layer width both decrease.
4. D.
   the barrier height decreases and the depletion layer width increases.

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1. A.
   $\lambda_d > \lambda_p > \lambda_e$
2. B.
   $\lambda_e > \lambda_p > \lambda_d$
3. C.
   $\lambda_p > \lambda_e > \lambda_d$
4. D.
   $\lambda_e = \lambda_p = \lambda_d$

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

Tap an option to check your answer.

1. A.
   a vertical arrow pointing UP, crossed by an oblique line that rises to the right, with the ball at the UPPER-RIGHT end of that oblique line
2. B.
   a vertical arrow pointing UP, crossed by an oblique line that rises to the right, with the ball at the LOWER-LEFT end of that oblique line
3. C.
   a vertical arrow pointing DOWN, crossed by an oblique line that rises to the right, with the ball at the LOWER-LEFT end of that oblique line
4. D.
   a vertical arrow pointing DOWN, crossed by an oblique line that rises to the right, with the ball at the UPPER-RIGHT end of that oblique line

Tap an option to check your answer.

1. A.
   For a convex mirror magnification is always negative.
2. B.
   For all virtual images formed by a mirror magnification is positive.
3. C.
   For a concave lens magnification is always positive.
4. D.
   For real and inverted images, magnification is always negative.

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1. A.
   f
2. B.
   2 f
3. C.
   $\frac{f}{2}$
4. D.
   $\frac{f}{4}$

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1. A.
   10 cm
2. B.
   12 cm
3. C.
   16 cm
4. D.
   20 cm

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1. A.
   $\mathrm{X_1 X_2}$
2. B.
   $\sqrt{\mathrm{X_1 + X_2}}$
3. C.
   $\sqrt{\mathrm{X_1 X_2}}$
4. D.
   $\sqrt{\frac{\mathrm{X_2}}{\mathrm{X_1}}}$

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1. A.
   5 $\mu$C
2. B.
   5 mC
3. C.
   25 mC
4. D.
   0.1 C

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1. A.
   Zero
2. B.
   5 mC
3. C.
   2.5 mC
4. D.
   5 $\mu$C

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1. A.
   $[\mathrm{M\,L^2\,T^{-3}\,A^{-2}}]$
2. B.
   $[\mathrm{M^0\,L^0\,T^{-1}\,A^0}]$
3. C.
   $[\mathrm{M^{-1}\,L^{-2}\,T^4\,A^2}]$
4. D.
   $[\mathrm{M^0\,L^0\,T\,A^0}]$

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1. A.
   $\frac{1}{2\sqrt{e}}$ mA
2. B.
   $\sqrt{e}$ mA
3. C.
   $\frac{1}{\sqrt{e}}$ mA
4. D.
   $\frac{1}{2e}$ mA

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1. A.
   5 mA
2. B.
   0.5 mA
3. C.
   2 mA
4. D.
   1 mA

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1. A.
2. B.
3. C.
4. D.

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1. A.
   2
2. B.
   $\frac{1}{2}$
3. C.
   $\frac{3}{2}$
4. D.
   $\frac{8}{9}$

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1. A.
   $(2\hat{j} + 3\hat{k})$ mN
2. B.
   $(-3\hat{j} + 2\hat{k})$ $\mu$N
3. C.
   $(6\hat{j} + 4\hat{k})$ mN
4. D.
   $(-4\hat{j} + 6\hat{k})$ $\mu$N

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1. A.
   4.0 A
2. B.
   3.8 A
3. C.
   0.97 A
4. D.
   0.10 A

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1. A.
   2592
2. B.
   2866
3. C.
   2976
4. D.
   3140

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1. A.
   Zero
2. B.
   $i_0 v_0 \cos \phi$
3. C.
   $\frac{i_0 v_0}{2}$
4. D.
   $\frac{i_0 v_0}{2} \cos \phi$

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1. A.
   have frequency lower than that of ultraviolet radiations.
2. B.
   have wavelength smaller than that of ultraviolet radiations.
3. C.
   move faster than ultraviolet radiations in air.
4. D.
   are mechanical waves but ultraviolet radiations are electro-magnetic waves.

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1. A.
   $\frac{\pi \mathrm{H}^2}{(n - 1)}$
2. B.
   $\frac{\pi \mathrm{H}^2}{(n^2 - 1)}$
3. C.
   $\frac{\pi \mathrm{H}^2}{\sqrt{n^2 - 1}}$
4. D.
   $\frac{\pi \mathrm{H}^2}{(n^2 + 1)}$

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1. A.
   0.4 eV
2. B.
   2.1 eV
3. C.
   2.5 eV
4. D.
   4.6 eV

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1. A.
   the barrier height and the depletion layer width both increase.
2. B.
   the barrier height increases and the depletion layer width decreases.
3. C.
   the barrier height and the depletion layer width both decrease.
4. D.
   the barrier height decreases and the depletion layer width increases.

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1. A.
   $\lambda_d > \lambda_p > \lambda_e$
2. B.
   $\lambda_e > \lambda_p > \lambda_d$
3. C.
   $\lambda_p > \lambda_e > \lambda_d$
4. D.
   $\lambda_e = \lambda_p = \lambda_d$

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1. A.
2. B.
3. C.
4. D.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
3. C.
   Assertion (A) is true, but Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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