CBSE Class 12 Physics 2025 question paper (55/6)

1. A.
   $T_2 = 2T_1$
2. B.
   $T_1 > T_2$
3. C.
   $T_1 = T_2 / 3$
4. D.
   $T_1 < T_2$

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1. A.
   $\left(\dfrac{n^2 - 1}{n^2}\right)R$
2. B.
   $\left(\dfrac{n^2 + 1}{n^2 - 1}\right)R$
3. C.
   $\left(\dfrac{n^2 - 1}{n}\right)R$
4. D.
   $\dfrac{(n^2 + 1)\,R}{n^2}$

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1. A.
   $\dfrac{\mu_0 I}{2\pi R}$
2. B.
   $\dfrac{\mu_0 I}{\pi R}$
3. C.
   $\dfrac{\mu_0 I}{4R}$
4. D.
   $\dfrac{\mu_0 I}{R}$

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1. A.
   moves along the field
2. B.
   moves opposite to the field
3. C.
   moves perpendicular to the field
4. D.
   does not move at all

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1. A.
   small resistance in series
2. B.
   large resistance in series
3. C.
   small resistance in parallel
4. D.
   large resistance in parallel

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

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

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1. A.
   10 V
2. B.
   12 V
3. C.
   14 V
4. D.
   16 V

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1. A.
   zero
2. B.
   $I_0$
3. C.
   $2I_0$
4. D.
   $4I_0$

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1. A.
   Red light
2. B.
   Blue light
3. C.
   Violet light
4. D.
   Green light

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1. A.
   $6{\cdot}63 \times 10^{-25}$
2. B.
   $1{\cdot}326 \times 10^{-27}$
3. C.
   $2{\cdot}652 \times 10^{-26}$
4. D.
   $3{\cdot}978 \times 10^{-24}$

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1. A.
   $F_{pp} > F_{pn} > F_{nn}$
2. B.
   $F_{pn} > F_{nn} > F_{pp}$
3. C.
   $F_{nn} > F_{pp} > F_{pn}$
4. D.
   $F_{pp} = F_{pn} = F_{nn}$

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

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1. A.
   $\dfrac{\sigma + \sigma_p}{\sigma}$
2. B.
   $\dfrac{\sigma}{\sigma - \sigma_p}$
3. C.
   $\dfrac{\sigma + \sigma_p}{\sigma_p}$
4. D.
   $\dfrac{\sigma}{\sigma_p}$

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1. A.
   $\dfrac{1}{2}\varepsilon_0 E^2$
2. B.
   $\varepsilon_0 Q^2 E$
3. C.
   $\dfrac{1}{2}\varepsilon_0 E^2 V$
4. D.
   $\varepsilon_0 E Q V$

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

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

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1. A.
   Boron
2. B.
   Antimony
3. C.
   Aluminium
4. D.
   Indium

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1. A.
   $0{\cdot}5$ eV
2. B.
   $0{\cdot}1$ eV
3. C.
   $0{\cdot}05$ eV
4. D.
   $0{\cdot}01$ eV

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1. A.
   a layer of negative charge on n-side and a layer of positive charge on p-side appear.
2. B.
   a layer of positive charge on n-side and a layer of negative charge on p-side appear.
3. C.
   the electrons on p-side of the junction move to n-side initially.
4. D.
   initially diffusion current is small and drift current is large.

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1. A.
   the drift current is of the order of few mA.
2. B.
   the applied voltage mostly drops across the depletion region.
3. C.
   the depletion region width decreases.
4. D.
   the current increases with increase in applied voltage.

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1. A.
   25 Hz
2. B.
   50 Hz
3. C.
   100 Hz
4. D.
   200 Hz

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

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

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1. A.
   $(0{\cdot}12\,\hat{j} - 0{\cdot}16\,\hat{k})$ N
2. B.
   $(-\,0{\cdot}16\,\hat{j} + 0{\cdot}12\,\hat{k})$ N
3. C.
   $(-\,0{\cdot}12\,\hat{j} + 0{\cdot}16\,\hat{k})$ N
4. D.
   $(0{\cdot}16\,\hat{j} - 0{\cdot}12\,\hat{k})$ N

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1. A.
   10 V
2. B.
   12 V
3. C.
   14 V
4. D.
   16 V

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

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1. A.
   zero
2. B.
   $I_0$
3. C.
   $2I_0$
4. D.
   $4I_0$

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1. A.
   $\left(\dfrac{n^2 - 1}{n^2}\right)R$
2. B.
   $\left(\dfrac{n^2 + 1}{n^2 - 1}\right)R$
3. C.
   $\left(\dfrac{n^2 - 1}{n}\right)R$
4. D.
   $\dfrac{(n^2 + 1)\,R}{n^2}$

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1. A.
   small resistance in series
2. B.
   large resistance in series
3. C.
   small resistance in parallel
4. D.
   large resistance in parallel

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1. A.
   $F_{pp} > F_{pn} > F_{nn}$
2. B.
   $F_{pn} > F_{nn} > F_{pp}$
3. C.
   $F_{nn} > F_{pp} > F_{pn}$
4. D.
   $F_{pp} = F_{pn} = F_{nn}$

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1. A.
   $0{\cdot}75$ nm
2. B.
   $1{\cdot}2$ nm
3. C.
   $2{\cdot}4$ nm
4. D.
   $0{\cdot}55$ nm

Tap an option to check your answer.

1. A.
   moves along the field
2. B.
   moves opposite to the field
3. C.
   moves perpendicular to the field
4. D.
   does not move at all

Tap an option to check your answer.

1. A.
   $6{\cdot}63 \times 10^{-25}$
2. B.
   $1{\cdot}326 \times 10^{-27}$
3. C.
   $2{\cdot}652 \times 10^{-26}$
4. D.
   $3{\cdot}978 \times 10^{-24}$

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.
   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.

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1. A.
   Boron
2. B.
   Antimony
3. C.
   Aluminium
4. D.
   Indium

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1. A.
   $0{\cdot}5$ eV
2. B.
   $0{\cdot}1$ eV
3. C.
   $0{\cdot}05$ eV
4. D.
   $0{\cdot}01$ eV

Tap an option to check your answer.

1. A.
   a layer of negative charge on n-side and a layer of positive charge on p-side appear.
2. B.
   a layer of positive charge on n-side and a layer of negative charge on p-side appear.
3. C.
   the electrons on p-side of the junction move to n-side initially.
4. D.
   initially diffusion current is small and drift current is large.

Tap an option to check your answer.

1. A.
   the drift current is of the order of few mA.
2. B.
   the applied voltage mostly drops across the depletion region.
3. C.
   the depletion region width decreases.
4. D.
   the current increases with increase in applied voltage.

Tap an option to check your answer.

1. A.
   25 Hz
2. B.
   50 Hz
3. C.
   100 Hz
4. D.
   200 Hz

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

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1. A.
   $\dfrac{\sigma + \sigma_p}{\sigma}$
2. B.
   $\dfrac{\sigma}{\sigma - \sigma_p}$
3. C.
   $\dfrac{\sigma + \sigma_p}{\sigma_p}$
4. D.
   $\dfrac{\sigma}{\sigma_p}$

Tap an option to check your answer.

1. A.
   $\dfrac{1}{2}\varepsilon_0 E^2$
2. B.
   $\varepsilon_0 Q^2 E$
3. C.
   $\dfrac{1}{2}\varepsilon_0 E^2 V$
4. D.
   $\varepsilon_0 E Q V$

Tap an option to check your answer.

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

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

Tap an option to check your answer.

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

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1. A.
   zero
2. B.
   $I_0$
3. C.
   $2I_0$
4. D.
   $4I_0$

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1. A.
   $\left(\dfrac{mv}{qE}\right)$ in x-y plane
2. B.
   $\left(\dfrac{mv^2}{qE^2}\right)$ in x-z plane
3. C.
   $\left(\dfrac{mv^2}{qE}\right)$ in x-y plane
4. D.
   $\left(\dfrac{mv}{qE^2}\right)$ in y-z plane

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

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1. A.
   $F_{pp} > F_{pn} > F_{nn}$
2. B.
   $F_{pn} > F_{nn} > F_{pp}$
3. C.
   $F_{nn} > F_{pp} > F_{pn}$
4. D.
   $F_{pp} = F_{pn} = F_{nn}$

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1. A.
   10 V
2. B.
   12 V
3. C.
   14 V
4. D.
   16 V

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

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1. A.
   $\left(\dfrac{n^2 - 1}{n^2}\right)R$
2. B.
   $\left(\dfrac{n^2 + 1}{n^2 - 1}\right)R$
3. C.
   $\left(\dfrac{n^2 - 1}{n}\right)R$
4. D.
   $\dfrac{(n^2 + 1)\,R}{n^2}$

Tap an option to check your answer.

1. A.
   moves along the field
2. B.
   moves opposite to the field
3. C.
   moves perpendicular to the field
4. D.
   does not move at all

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1. A.
   energy
2. B.
   angular momentum
3. C.
   velocity
4. D.
   linear momentum

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1. A.
   small resistance in series
2. B.
   large resistance in series
3. C.
   small resistance in parallel
4. D.
   large resistance in parallel

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1. A.
   $6{\cdot}63 \times 10^{-25}$
2. B.
   $1{\cdot}326 \times 10^{-27}$
3. C.
   $2{\cdot}652 \times 10^{-26}$
4. D.
   $3{\cdot}978 \times 10^{-24}$

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.

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.
   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.
   $\dfrac{1}{6}$
2. B.
   $\dfrac{1}{3}$
3. C.
   3
4. D.
   6