CBSE Class 12 Physics 2025 question paper (55/5)

1. A.
   remains C
2. B.
   becomes greater than C
3. C.
   becomes less than C
4. D.
   becomes zero

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1. A.
   $\dfrac{\alpha}{r}$
2. B.
   $\dfrac{\alpha r^2}{2}$
3. C.
   $\dfrac{\alpha}{2r^2}$
4. D.
   $-\dfrac{\alpha}{r}$

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1. A.
   4R
2. B.
   $\infty$
3. C.
   $\dfrac{R}{4}$
4. D.
   $\dfrac{4R}{3}$

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1. A.
   $2{\cdot}5$ cm
2. B.
   5 cm
3. C.
   8 cm
4. D.
   10 cm

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1. A.
   $0{\cdot}019\ \mathrm{Am^2}$
2. B.
   $0{\cdot}14\ \mathrm{Am^2}$
3. C.
   $0{\cdot}196\ \mathrm{Am^2}$
4. D.
   $0{\cdot}615\ \mathrm{Am^2}$

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1. A.
   32 V
2. B.
   37 V
3. C.
   64 V
4. D.
   69 V

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1. A.
   Infrared rays
2. B.
   $\gamma$ rays
3. C.
   UV rays
4. D.
   Visible light rays

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

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1. A.
   X-rays
2. B.
   AM radio waves
3. C.
   Microwaves
4. D.
   TV waves

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1. A.
   $f_o$ and $f_e$ small, and $f_e > f_o$
2. B.
   $f_o$ and $f_e$ small, and $f_o > f_e$
3. C.
   $f_o$ and $f_e$ large, and $f_e > f_o$
4. D.
   $f_o$ and $f_e$ large, and $f_o > f_e$

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1. A.
   0 and $2a^2$
2. B.
   0 and $4a^2$
3. C.
   $a^2$ and $2a^2$
4. D.
   $2a^2$ and $4a^2$

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1. A.
   $\dfrac{1}{16}$
2. B.
   $\dfrac{1}{8}$
3. C.
   $\dfrac{1}{4}$
4. D.
   $\dfrac{1}{2}$

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

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

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

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

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1. A.
   $\dfrac{k}{\mathrm{NBA}}$
2. B.
   $\dfrac{\mathrm{NBA}}{k}$
3. C.
   $\dfrac{k\mathrm{BA}}{\mathrm{N}}$
4. D.
   $\dfrac{k\mathrm{NB}}{\mathrm{A}}$

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1. A.
   $0{\cdot}25$ $\Omega$
2. B.
   $0{\cdot}30$ $\Omega$
3. C.
   $0{\cdot}50$ $\Omega$
4. D.
   $6{\cdot}0$ $\Omega$

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1. A.
   $0{\cdot}20$ $\Omega$
2. B.
   $0{\cdot}24$ $\Omega$
3. C.
   $6{\cdot}0$ $\Omega$
4. D.
   $6{\cdot}25$ $\Omega$

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1. A.
   $(R_2 - 2R_1)$
2. B.
   $(R_2 - R_1)$
3. C.
   $(R_1 + R_2)$
4. D.
   $(R_1 - 2R_2)$

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1. A.
   $3{\cdot}6 \times 10^{-3}$ Nm
2. B.
   $1{\cdot}8 \times 10^{-4}$ Nm
3. C.
   $2{\cdot}4 \times 10^{-3}$ Nm
4. D.
   $1{\cdot}2 \times 10^{-4}$ Nm

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

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1. A.
   increases linearly
2. B.
   decreases
3. C.
   increases non-linearly
4. D.
   remains the same

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1. A.
   Photocurrent versus Intensity of incident light
2. B.
   Photocurrent versus Frequency of incident light
3. C.
   Cut-off potential versus Frequency of incident light
4. D.
   Cut-off potential versus Intensity of incident light

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1. A.
   $K_R > K_Y > K_B$
2. B.
   $K_Y > K_B > K_R$
3. C.
   $K_B > K_Y > K_R$
4. D.
   $K_R > K_B > K_Y$

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1. A.
   Caesium
2. B.
   Zinc
3. C.
   Cadmium
4. D.
   Magnesium

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1. A.
   Infrared rays
2. B.
   $\gamma$ rays
3. C.
   UV rays
4. D.
   Visible light rays

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1. A.
   $\dfrac{4}{3}\ \mu\mathrm{F}$
2. B.
   $2\ \mu\mathrm{F}$
3. C.
   $\dfrac{3}{2}\ \mu\mathrm{F}$
4. D.
   $6\ \mu\mathrm{F}$

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1. A.
   $\dfrac{\alpha}{r}$
2. B.
   $\dfrac{\alpha r^2}{2}$
3. C.
   $\dfrac{\alpha}{2r^2}$
4. D.
   $-\dfrac{\alpha}{r}$

Tap an option to check your answer.

1. A.
   0 and $2a^2$
2. B.
   0 and $4a^2$
3. C.
   $a^2$ and $2a^2$
4. D.
   $2a^2$ and $4a^2$

Tap an option to check your answer.

1. A.
   $0{\cdot}019\ \mathrm{Am^2}$
2. B.
   $0{\cdot}14\ \mathrm{Am^2}$
3. C.
   $0{\cdot}196\ \mathrm{Am^2}$
4. D.
   $0{\cdot}615\ \mathrm{Am^2}$

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1. A.
   high ac voltage and large ac current to low ac voltage and small ac current
2. B.
   high ac voltage and small ac current to low ac voltage and small ac current
3. C.
   low ac voltage and large ac current to high ac voltage and small ac current
4. D.
   low ac voltage and small ac current to high ac voltage and large ac current

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1. A.
   4R
2. B.
   $\infty$
3. C.
   $\dfrac{R}{4}$
4. D.
   $\dfrac{4R}{3}$

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1. A.
   X-rays
2. B.
   AM radio waves
3. C.
   Microwaves
4. D.
   TV waves

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1. A.
   $\dfrac{1}{16}$
2. B.
   $\dfrac{1}{8}$
3. C.
   $\dfrac{1}{4}$
4. D.
   $\dfrac{1}{2}$

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

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

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1. A.
   $2{\cdot}5$ cm
2. B.
   5 cm
3. C.
   8 cm
4. D.
   10 cm

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

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

Tap an option to check your answer.

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

Tap an option to check your answer.

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

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

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1. A.
   increases linearly
2. B.
   decreases
3. C.
   increases non-linearly
4. D.
   remains the same

Tap an option to check your answer.

1. A.
   Photocurrent versus Intensity of incident light
2. B.
   Photocurrent versus Frequency of incident light
3. C.
   Cut-off potential versus Frequency of incident light
4. D.
   Cut-off potential versus Intensity of incident light

Tap an option to check your answer.

1. A.
   $K_R > K_Y > K_B$
2. B.
   $K_Y > K_B > K_R$
3. C.
   $K_B > K_Y > K_R$
4. D.
   $K_R > K_B > K_Y$

Tap an option to check your answer.

1. A.
   Caesium
2. B.
   Zinc
3. C.
   Cadmium
4. D.
   Magnesium

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1. A.
   $\dfrac{k}{\mathrm{NBA}}$
2. B.
   $\dfrac{\mathrm{NBA}}{k}$
3. C.
   $\dfrac{k\mathrm{BA}}{\mathrm{N}}$
4. D.
   $\dfrac{k\mathrm{NB}}{\mathrm{A}}$

Tap an option to check your answer.

1. A.
   $0{\cdot}25$ $\Omega$
2. B.
   $0{\cdot}30$ $\Omega$
3. C.
   $0{\cdot}50$ $\Omega$
4. D.
   $6{\cdot}0$ $\Omega$

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1. A.
   $0{\cdot}20$ $\Omega$
2. B.
   $0{\cdot}24$ $\Omega$
3. C.
   $6{\cdot}0$ $\Omega$
4. D.
   $6{\cdot}25$ $\Omega$

Tap an option to check your answer.

1. A.
   $(R_2 - 2R_1)$
2. B.
   $(R_2 - R_1)$
3. C.
   $(R_1 + R_2)$
4. D.
   $(R_1 - 2R_2)$

Tap an option to check your answer.

1. A.
   $3{\cdot}6 \times 10^{-3}$ Nm
2. B.
   $1{\cdot}8 \times 10^{-4}$ Nm
3. C.
   $2{\cdot}4 \times 10^{-3}$ Nm
4. D.
   $1{\cdot}2 \times 10^{-4}$ Nm

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1. A.
   540 nm
2. B.
   480 nm
3. C.
   420 nm
4. D.
   720 nm

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

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1. A.
   $\dfrac{Q^2}{\pi \varepsilon_0 l}$
2. B.
   $\dfrac{\sqrt{2}\,Q^2}{\pi \varepsilon_0 l}$
3. C.
   $\dfrac{Q^2}{2\pi \varepsilon_0 l}$
4. D.
   Zero

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1. A.
   remains C
2. B.
   becomes greater than C
3. C.
   becomes less than C
4. D.
   becomes zero

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1. A.
   4R
2. B.
   $\infty$
3. C.
   $\dfrac{R}{4}$
4. D.
   $\dfrac{4R}{3}$

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1. A.
   $2{\cdot}5$ cm
2. B.
   5 cm
3. C.
   8 cm
4. D.
   10 cm

Tap an option to check your answer.

1. A.
   $0{\cdot}019\ \mathrm{Am^2}$
2. B.
   $0{\cdot}14\ \mathrm{Am^2}$
3. C.
   $0{\cdot}196\ \mathrm{Am^2}$
4. D.
   $0{\cdot}615\ \mathrm{Am^2}$

Tap an option to check your answer.

1. A.
   Infrared rays
2. B.
   $\gamma$ rays
3. C.
   UV rays
4. D.
   Visible light rays

Tap an option to check your answer.

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