CBSE Class 12 Physics 2025 question paper (55/7)

1. A.
   250 V
2. B.
   200 V
3. C.
   100 V
4. D.
   50 V

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1. A.
   $6\,\Omega$
2. B.
   $\dfrac{8}{3}\,\Omega$
3. C.
   $\dfrac{16}{3}\,\Omega$
4. D.
   $2\,\Omega$

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1. A.
   BA sin $\alpha$
2. B.
   BA cos $\alpha$
3. C.
   BA
4. D.
   zero

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1. A.
   $\left(\dfrac{1}{200}\right)$ s
2. B.
   $\left(\dfrac{1}{150}\right)$ s
3. C.
   $\left(\dfrac{1}{100}\right)$ s
4. D.
   $\left(\dfrac{1}{50}\right)$ s

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1. A.
   inductive only
2. B.
   capacitive only
3. C.
   capacitive and inductive respectively
4. D.
   inductive and capacitive respectively

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1. A.
   $0{\cdot}1$ mV
2. B.
   $0{\cdot}2$ mV
3. C.
   $0{\cdot}8$ mV
4. D.
   $1{\cdot}6$ mV

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

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1. A.
   $1{\cdot}18 \times 10^{14}$ Hz
2. B.
   $3{\cdot}20 \times 10^{14}$ Hz
3. C.
   $4{\cdot}20 \times 10^{15}$ Hz
4. D.
   $4{\cdot}80 \times 10^{15}$ Hz

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1. A.
   electrons only
2. B.
   holes only
3. C.
   holes and few electrons
4. D.
   electrons and few holes

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1. A.
   n = 4 to n = 3
2. B.
   n = 3 to n = 2
3. C.
   n = 2 to n = 1
4. D.
   n = 3 to n = 1

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

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1. A.
   same mass numbers
2. B.
   same atomic numbers
3. C.
   same neutron number, but different atomic number
4. D.
   different neutron number, and different mass number

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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.
   2
4. D.
   1

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1. A.
   $2{\cdot}5 \times 10^{4}$
2. B.
   $3{\cdot}0 \times 10^{5}$
3. C.
   $3{\cdot}75 \times 10^{6}$
4. D.
   $5{\cdot}0 \times 10^{7}$

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1. A.
   $250\,^{\circ}\mathrm{C}$
2. B.
   $500\,^{\circ}\mathrm{C}$
3. C.
   $850\,^{\circ}\mathrm{C}$
4. D.
   $1000\,^{\circ}\mathrm{C}$

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1. A.
   I decreases and II increases.
2. B.
   I increases and II is almost constant.
3. C.
   Both I and II increase.
4. D.
   I decreases and II is almost constant.

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1. A.
   II and III change, but I is constant.
2. B.
   I and II change, but III is constant.
3. C.
   I and III change, but II is constant.
4. D.
   All I, II and III change.

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

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1. A.
   $1{\cdot}3$
2. B.
   $1{\cdot}4$
3. C.
   $1{\cdot}5$
4. D.
   $1{\cdot}6$

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1. A.
   decrease by 4%
2. B.
   increase by 4%
3. C.
   decrease by 19%
4. D.
   increase by 19%

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1. A.
   always real
2. B.
   always virtual
3. C.
   first real and then virtual
4. D.
   first virtual and then real

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1. A.
   10 cm
2. B.
   15 cm
3. C.
   20 cm
4. D.
   40 cm

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1. A.
   $\mathrm{E} = 0,\ \mathrm{V} = 0$
2. B.
   $\mathrm{E} = 0,\ \mathrm{V} = \mathrm{V_0}$ (a constant)
3. C.
   $\mathrm{E} \neq 0,\ \mathrm{V} \neq 0$
4. D.
   $\mathrm{E} = \mathrm{E_0}$ (a constant), $\mathrm{V} = 0$

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

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

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1. A.
   $1{\cdot}18 \times 10^{14}$ Hz
2. B.
   $3{\cdot}20 \times 10^{14}$ Hz
3. C.
   $4{\cdot}20 \times 10^{15}$ Hz
4. D.
   $4{\cdot}80 \times 10^{15}$ Hz

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1. A.
   $0{\cdot}1$ mV
2. B.
   $0{\cdot}2$ mV
3. C.
   $0{\cdot}8$ mV
4. D.
   $1{\cdot}6$ mV

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1. A.
   electrons only
2. B.
   holes only
3. C.
   holes and few electrons
4. D.
   electrons and few holes

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1. A.
   $6\,\Omega$
2. B.
   $\dfrac{8}{3}\,\Omega$
3. C.
   $\dfrac{16}{3}\,\Omega$
4. D.
   $2\,\Omega$

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1. A.
   inductive only
2. B.
   capacitive only
3. C.
   capacitive and inductive respectively
4. D.
   inductive and capacitive respectively

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1. A.
   $\left(\dfrac{1}{200}\right)$ s
2. B.
   $\left(\dfrac{1}{150}\right)$ s
3. C.
   $\left(\dfrac{1}{100}\right)$ s
4. D.
   $\left(\dfrac{1}{50}\right)$ s

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1. A.
   $\dfrac{27}{64}$
2. B.
   $\dfrac{9}{16}$
3. C.
   $\dfrac{3\sqrt{3}}{8}$
4. D.
   $\dfrac{3}{4}$

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1. A.
   same mass numbers
2. B.
   same atomic numbers
3. C.
   same neutron number, but different atomic number
4. D.
   different neutron number, and different mass number

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

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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.

Tap an option to check your answer.

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

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1. A.
   $1{\cdot}3$
2. B.
   $1{\cdot}4$
3. C.
   $1{\cdot}5$
4. D.
   $1{\cdot}6$

Tap an option to check your answer.

1. A.
   decrease by 4%
2. B.
   increase by 4%
3. C.
   decrease by 19%
4. D.
   increase by 19%

Tap an option to check your answer.

1. A.
   always real
2. B.
   always virtual
3. C.
   first real and then virtual
4. D.
   first virtual and then real

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1. A.
   10 cm
2. B.
   15 cm
3. C.
   20 cm
4. D.
   40 cm

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

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1. A.
   $2{\cdot}5 \times 10^{4}$
2. B.
   $3{\cdot}0 \times 10^{5}$
3. C.
   $3{\cdot}75 \times 10^{6}$
4. D.
   $5{\cdot}0 \times 10^{7}$

Tap an option to check your answer.

1. A.
   $250\,^{\circ}\mathrm{C}$
2. B.
   $500\,^{\circ}\mathrm{C}$
3. C.
   $850\,^{\circ}\mathrm{C}$
4. D.
   $1000\,^{\circ}\mathrm{C}$

Tap an option to check your answer.

1. A.
   I decreases and II increases.
2. B.
   I increases and II is almost constant.
3. C.
   Both I and II increase.
4. D.
   I decreases and II is almost constant.

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1. A.
   II and III change, but I is constant.
2. B.
   I and II change, but III is constant.
3. C.
   I and III change, but II is constant.
4. D.
   All I, II and III change.

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1. A.
   20 $\mu\mathrm{C}$
2. B.
   $-$ 20 $\mu\mathrm{C}$
3. C.
   30 $\mu\mathrm{C}$
4. D.
   $-$ 30 $\mu\mathrm{C}$

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1. A.
   electrons only
2. B.
   holes only
3. C.
   holes and few electrons
4. D.
   electrons and few holes

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

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

Tap an option to check your answer.

1. A.
   same mass numbers
2. B.
   same atomic numbers
3. C.
   same neutron number, but different atomic number
4. D.
   different neutron number, and different mass number

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1. A.
   $0{\cdot}1$ mV
2. B.
   $0{\cdot}2$ mV
3. C.
   $0{\cdot}8$ mV
4. D.
   $1{\cdot}6$ mV

Tap an option to check your answer.

1. A.
   $1{\cdot}18 \times 10^{14}$ Hz
2. B.
   $3{\cdot}20 \times 10^{14}$ Hz
3. C.
   $4{\cdot}20 \times 10^{15}$ Hz
4. D.
   $4{\cdot}80 \times 10^{15}$ Hz

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1. A.
   $\left(\dfrac{1}{200}\right)$ s
2. B.
   $\left(\dfrac{1}{150}\right)$ s
3. C.
   $\left(\dfrac{1}{100}\right)$ s
4. D.
   $\left(\dfrac{1}{50}\right)$ s

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1. A.
   BA sin $\alpha$
2. B.
   BA cos $\alpha$
3. C.
   BA
4. D.
   zero

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1. A.
   $3{\cdot}4$ eV
2. B.
   less than $3{\cdot}4$ eV
3. C.
   $13{\cdot}6$ eV
4. D.
   between $13{\cdot}6$ eV and $3{\cdot}4$ eV

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1. A.
   inductive only
2. B.
   capacitive only
3. C.
   capacitive and inductive respectively
4. D.
   inductive and capacitive respectively

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

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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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