CBSE Class 12 Physics 2026 question paper (55/3)

1. A.
   $q E_0 x^2$
2. B.
   $q E_0 x$
3. C.
   $q^2 E_0 x$
4. D.
   $q^2 E_0^2 x$

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1. A.
   $0{\cdot}25$ V
2. B.
   $0{\cdot}50$ V
3. C.
   $0{\cdot}75$ V
4. D.
   $1{\cdot}0$ V

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1. A.
   $2{\cdot}0 \times 10^{8}\ \mathrm{ms^{-1}}$
2. B.
   $4{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
3. C.
   $3{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
4. D.
   $2{\cdot}5 \times 10^{8}\ \mathrm{ms^{-1}}$

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

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1. A.
   $2n\pi$
2. B.
   $2n\pi + \dfrac{\pi}{4}$
3. C.
   $2n\pi + \dfrac{\pi}{2}$
4. D.
   $2n\pi + \pi$

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1. A.
   24, 150 cm
2. B.
   42, 138 cm
3. C.
   24, 138 cm
4. D.
   42, 150 cm

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1. A.
   Twinkling of stars
2. B.
   Brilliance of diamonds
3. C.
   Optical fibre
4. D.
   Reflecting prism

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1. A.
   $3{\cdot}5$ eV
2. B.
   $3{\cdot}0$ eV
3. C.
   $2{\cdot}5$ eV
4. D.
   $2{\cdot}0$ eV

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

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1. A.
   1
2. B.
   $\dfrac{4}{3}$
3. C.
   $\dfrac{3}{4}$
4. D.
   $\dfrac{27}{64}$

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1. A.
   $200\ \Omega$
2. B.
   $175\ \Omega$
3. C.
   $100\ \Omega$
4. D.
   $125\ \Omega$

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1. A.
   forward biasing
2. B.
   reverse biasing
3. C.
   no biasing at low temperature
4. D.
   no biasing at high temperature

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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.
   $6\ \mu\mathrm{F}$
2. B.
   $3\ \mu\mathrm{F}$
3. C.
   $9\ \mu\mathrm{F}$
4. D.
   $2\ \mu\mathrm{F}$

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

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1. A.
   2 V
2. B.
   $0{\cdot}3$ V
3. C.
   $0{\cdot}2$ V
4. D.
   3 V

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1. A.
   $6\ \mu\mathrm{C}$
2. B.
   $4\ \mu\mathrm{C}$
3. C.
   $12\ \mu\mathrm{C}$
4. D.
   $8\ \mu\mathrm{C}$

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1. A.
   increase
2. B.
   decrease
3. C.
   remain the same
4. D.
   first increase then become stable

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

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

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1. A.
   both particles revolve clockwise
2. B.
   both particles revolve anticlockwise
3. C.
   particle 1 revolves clockwise while particle 2 revolves anticlockwise
4. D.
   particle 1 revolves anticlockwise while particle 2 revolves clockwise

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

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1. A.
   $p_1 = \dfrac{p_2}{2}$
2. B.
   $p_1 = p_2$
3. C.
   $p_1 = 2p_2$
4. D.
   $p_1 = 4p_2$

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1. A.
   $2n\pi$
2. B.
   $2n\pi + \dfrac{\pi}{4}$
3. C.
   $2n\pi + \dfrac{\pi}{2}$
4. D.
   $2n\pi + \pi$

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1. A.
   1
2. B.
   $\dfrac{4}{3}$
3. C.
   $\dfrac{3}{4}$
4. D.
   $\dfrac{27}{64}$

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1. A.
   30 cm
2. B.
   20 cm
3. C.
   15 cm
4. D.
   $7{\cdot}5$ cm

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

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1. A.
   40 cm
2. B.
   80 cm
3. C.
   160 cm
4. D.
   200 cm

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1. A.
   $3{\cdot}5$ eV
2. B.
   $3{\cdot}0$ eV
3. C.
   $2{\cdot}5$ eV
4. D.
   $2{\cdot}0$ eV

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1. A.
   20 V
2. B.
   32 V
3. C.
   40 V
4. D.
   63 V

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1. A.
   a diode between a left terminal at $+5$ V and a right terminal at $+10$ V
2. B.
   a diode between a left terminal at $-1{\cdot}0$ V and a right terminal at $-1{\cdot}5$ V
3. C.
   a diode between a left terminal at 0 V and a right terminal at 1 V
4. D.
   a diode between a left terminal at $-2$ V and a right terminal at 0 V

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1. A.
   $200\ \Omega$
2. B.
   $175\ \Omega$
3. C.
   $100\ \Omega$
4. D.
   $125\ \Omega$

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1. A.
   $2{\cdot}0 \times 10^{8}\ \mathrm{ms^{-1}}$
2. B.
   $4{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
3. C.
   $3{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
4. D.
   $2{\cdot}5 \times 10^{8}\ \mathrm{ms^{-1}}$

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1. A.
   Wavelength of incident radiation only
2. B.
   Intensity of incident radiation only
3. C.
   Work function of the surface only
4. D.
   Both wavelength of the incident radiation and work function of the surface

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

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

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

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1. A.
   both particles revolve clockwise
2. B.
   both particles revolve anticlockwise
3. C.
   particle 1 revolves clockwise while particle 2 revolves anticlockwise
4. D.
   particle 1 revolves anticlockwise while particle 2 revolves clockwise

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

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1. A.
   $p_1 = \dfrac{p_2}{2}$
2. B.
   $p_1 = p_2$
3. C.
   $p_1 = 2p_2$
4. D.
   $p_1 = 4p_2$

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1. A.
   $6\ \mu\mathrm{F}$
2. B.
   $3\ \mu\mathrm{F}$
3. C.
   $9\ \mu\mathrm{F}$
4. D.
   $2\ \mu\mathrm{F}$

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

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1. A.
   2 V
2. B.
   $0{\cdot}3$ V
3. C.
   $0{\cdot}2$ V
4. D.
   3 V

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1. A.
   $6\ \mu\mathrm{C}$
2. B.
   $4\ \mu\mathrm{C}$
3. C.
   $12\ \mu\mathrm{C}$
4. D.
   $8\ \mu\mathrm{C}$

Tap an option to check your answer.

1. A.
   increase
2. B.
   decrease
3. C.
   remain the same
4. D.
   first increase then become stable

Tap an option to check your answer.

1. A.
   $2{\cdot}0 \times 10^{8}\ \mathrm{ms^{-1}}$
2. B.
   $4{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
3. C.
   $3{\cdot}5 \times 10^{7}\ \mathrm{ms^{-1}}$
4. D.
   $2{\cdot}5 \times 10^{8}\ \mathrm{ms^{-1}}$

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1. A.
   same wavelength
2. B.
   same frequency
3. C.
   same intensity
4. D.
   same speed

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1. A.
   $200\ \Omega$
2. B.
   $175\ \Omega$
3. C.
   $100\ \Omega$
4. D.
   $125\ \Omega$

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1. A.
   $\sqrt{29}\ B_0 L^2$
2. B.
   $4 B_0 L^2$
3. C.
   $3 B_0 L^2$
4. D.
   $2 B_0 L^2$

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1. A.
   $2{\cdot}54 \times 10^{-25}$ J
2. B.
   $1{\cdot}27 \times 10^{-24}$ J
3. C.
   $1{\cdot}02 \times 10^{-23}$ J
4. D.
   $2{\cdot}29 \times 10^{-26}$ J

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

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1. A.
   Curves 1 and 3 both correspond to forward biasing of p-n junction.
2. B.
   Curve 3 corresponds to forward biasing and Curve 1 corresponds to reverse biasing.
3. C.
   Curve 1 corresponds to forward biasing and Curve 3 corresponds to reverse biasing.
4. D.
   Curves 1 and 3 both correspond to reverse biasing.

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1. A.
   1
2. B.
   $\dfrac{4}{3}$
3. C.
   $\dfrac{3}{4}$
4. D.
   $\dfrac{27}{64}$