CBSE Class 12 Physics 2024 question paper (55/1)

1. A.
   $\dfrac{\lambda}{2\varepsilon_0 \mathrm{R}}$
2. B.
   Zero
3. C.
   $\dfrac{\lambda}{4\pi\varepsilon_0 \mathrm{R}}$
4. D.
   $\dfrac{\lambda}{4\varepsilon_0 \mathrm{R}}$

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

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1. A.
   6 V
2. B.
   8 V
3. C.
   9 V
4. D.
   12 V

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1. A.
   move along x-axis
2. B.
   move along y-axis
3. C.
   shrink
4. D.
   expand

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1. A.
   $(0{\cdot}8\ \mathrm{mN})\hat{i}$
2. B.
   $-\ (0{\cdot}8\ \mathrm{mN})\hat{i}$
3. C.
   $(80\ \mathrm{mN})\hat{i}$
4. D.
   $-\ (80\ \mathrm{mN})\hat{i}$

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1. A.
   $\dfrac{\mathrm{G}}{999}\ \Omega$
2. B.
   $\dfrac{\mathrm{G}}{1000}\ \Omega$
3. C.
   $\dfrac{\mathrm{G}}{1001}\ \Omega$
4. D.
   $\dfrac{\mathrm{G}}{100{\cdot}1}\ \Omega$

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

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1. A.
   I
2. B.
   IV
3. C.
   II
4. D.
   III

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1. A.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = 3$
2. B.
   $\mathrm{n}_f = 3$ and $\mathrm{n}_i = 4$
3. C.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = 4$
4. D.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = \infty$

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1. A.
   the structure of Ge lattice is distorted.
2. B.
   the number of conduction electrons increases.
3. C.
   the number of holes increases.
4. D.
   the number of conduction electrons decreases.

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

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

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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.
   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 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.
   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 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.
   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 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.
   Assertion (A) is false and Reason (R) is also false.

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

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

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

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

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1. A.
   $6{\cdot}6$ D
2. B.
   15 D
3. C.
   $\dfrac{1}{15}$ D
4. D.
   $\dfrac{1}{80}$ D

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1. A.
   $\dfrac{\mathrm{V}_0}{\sqrt{2}}$
2. B.
   $\dfrac{\mathrm{V}_0^2}{\sqrt{2}}$
3. C.
   $\dfrac{2\mathrm{V}_0}{\sqrt{2}}$
4. D.
   $\dfrac{\mathrm{V}_0}{2\sqrt{2}}$

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1. A.
   Complete cycle of the input signal
2. B.
   Half cycle of the input signal
3. C.
   Less than half cycle of the input signal
4. D.
   Only for the positive half cycle of the input signal

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1. A.
   Both diodes are forward biased at the same time.
2. B.
   Both diodes are reverse biased at the same time.
3. C.
   One is forward biased and the other is reverse biased at the same time.
4. D.
   Both are forward biased in the first half of the cycle and reverse biased in the second half of the cycle.

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

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1. A.
   10 V
2. B.
   $-$ 10 V
3. C.
   $-$ 5 V
4. D.
   $+$ 5 V

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1. A.
   $\dfrac{\lambda}{2\varepsilon_0 \mathrm{R}}$
2. B.
   Zero
3. C.
   $\dfrac{\lambda}{4\pi\varepsilon_0 \mathrm{R}}$
4. D.
   $\dfrac{\lambda}{4\varepsilon_0 \mathrm{R}}$

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

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1. A.
   4E and 2r
2. B.
   4E and 3r
3. C.
   3E and 4r
4. D.
   2E and 4r

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

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1. A.
   $(0{\cdot}8\ \mathrm{mN})\hat{i}$
2. B.
   $-\ (0{\cdot}8\ \mathrm{mN})\hat{i}$
3. C.
   $(80\ \mathrm{mN})\hat{i}$
4. D.
   $-\ (80\ \mathrm{mN})\hat{i}$

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1. A.
   $\dfrac{\mathrm{G}}{999}\ \Omega$
2. B.
   $\dfrac{\mathrm{G}}{1000}\ \Omega$
3. C.
   $\dfrac{\mathrm{G}}{1001}\ \Omega$
4. D.
   $\dfrac{\mathrm{G}}{100{\cdot}1}\ \Omega$

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

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1. A.
   In the same phase and perpendicular to each other.
2. B.
   In the same phase and not perpendicular to each other.
3. C.
   Not in the same phase but are perpendicular to each other.
4. D.
   Neither in the same phase nor perpendicular to each other.

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

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

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1. A.
   the structure of Ge lattice is distorted.
2. B.
   the number of conduction electrons increases.
3. C.
   the number of holes increases.
4. D.
   the number of conduction electrons decreases.

Tap an option to check your answer.

1. A.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = 3$
2. B.
   $\mathrm{n}_f = 3$ and $\mathrm{n}_i = 4$
3. C.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = 4$
4. D.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = \infty$

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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.
   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 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.
   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 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.
   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 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.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   $\dfrac{\mathrm{V}_0}{\sqrt{2}}$
2. B.
   $\dfrac{\mathrm{V}_0^2}{\sqrt{2}}$
3. C.
   $\dfrac{2\mathrm{V}_0}{\sqrt{2}}$
4. D.
   $\dfrac{\mathrm{V}_0}{2\sqrt{2}}$

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1. A.
   Complete cycle of the input signal
2. B.
   Half cycle of the input signal
3. C.
   Less than half cycle of the input signal
4. D.
   Only for the positive half cycle of the input signal

Tap an option to check your answer.

1. A.
   Both diodes are forward biased at the same time.
2. B.
   Both diodes are reverse biased at the same time.
3. C.
   One is forward biased and the other is reverse biased at the same time.
4. D.
   Both are forward biased in the first half of the cycle and reverse biased in the second half of the cycle.

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

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1. A.
   10 V
2. B.
   $-$ 10 V
3. C.
   $-$ 5 V
4. D.
   $+$ 5 V

Tap an option to check your answer.

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

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

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

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

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1. A.
   $6{\cdot}6$ D
2. B.
   15 D
3. C.
   $\dfrac{1}{15}$ D
4. D.
   $\dfrac{1}{80}$ D

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1. A.
   $\dfrac{\lambda}{2\varepsilon_0 \mathrm{R}}$
2. B.
   Zero
3. C.
   $\dfrac{\lambda}{4\pi\varepsilon_0 \mathrm{R}}$
4. D.
   $\dfrac{\lambda}{4\varepsilon_0 \mathrm{R}}$

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

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1. A.
   $\vec{\mathrm{E}}$ and $\vec{j}$ both are along $+ x$ direction.
2. B.
   $\vec{\mathrm{E}}$ and $\vec{j}$ both are along $- x$ direction.
3. C.
   $\vec{\mathrm{E}}$ is along $+ x$ direction, but $\vec{j}$ is along $- x$ direction.
4. D.
   $\vec{\mathrm{E}}$ is along $- x$ direction, but $\vec{j}$ is along $+ x$ direction.

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1. A.
   $\dfrac{a}{b}$
2. B.
   $\dfrac{b}{a}$
3. C.
   $\left(\dfrac{a}{b}\right)^2$
4. D.
   $\left(\dfrac{b}{a}\right)^2$

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1. A.
   $\dfrac{\mathrm{G}}{999}\ \Omega$
2. B.
   $\dfrac{\mathrm{G}}{1000}\ \Omega$
3. C.
   $\dfrac{\mathrm{G}}{1001}\ \Omega$
4. D.
   $\dfrac{\mathrm{G}}{100{\cdot}1}\ \Omega$

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1. A.
   $(0{\cdot}8\ \mathrm{mN})\hat{i}$
2. B.
   $-\ (0{\cdot}8\ \mathrm{mN})\hat{i}$
3. C.
   $(80\ \mathrm{mN})\hat{i}$
4. D.
   $-\ (80\ \mathrm{mN})\hat{i}$

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1. A.
   220 V – 50 Hz
2. B.
   1100 V – 50 Hz
3. C.
   2200 V – 5 Hz
4. D.
   2200 V – 50 Hz

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1. A.
   J.C. Maxwell
2. B.
   H.R. Hertz
3. C.
   J.C. Bose
4. D.
   G. Marconi

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

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

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1. A.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = 3$
2. B.
   $\mathrm{n}_f = 3$ and $\mathrm{n}_i = 4$
3. C.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = 4$
4. D.
   $\mathrm{n}_f = 2$ and $\mathrm{n}_i = \infty$

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1. A.
   the structure of Ge lattice is distorted.
2. B.
   the number of conduction electrons increases.
3. C.
   the number of holes increases.
4. D.
   the number of conduction electrons decreases.

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.
   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 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.
   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 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.
   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 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.
   Assertion (A) is false and Reason (R) is also false.

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

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

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

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