CBSE Class 12 Physics 2023 question paper (55/3)

1. A.
   $\left(1{\cdot}0 \times 10^{3}\ \dfrac{\mathrm{N}}{\mathrm{C}}\right)\hat{i}$
2. B.
   $-\left(1{\cdot}0 \times 10^{3}\ \dfrac{\mathrm{N}}{\mathrm{C}}\right)\hat{i}$
3. C.
   $\left(1{\cdot}0 \times 10^{-3}\ \dfrac{\mathrm{N}}{\mathrm{C}}\right)\hat{i}$
4. D.
   $-\left(1{\cdot}0 \times 10^{-3}\ \dfrac{\mathrm{N}}{\mathrm{C}}\right)\hat{i}$

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1. A.
   Electric field
2. B.
   Voltage
3. C.
   Resistivity
4. D.
   Power

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1. A.
   $n\,e\,\mathrm{A}\,v_d$
2. B.
   $\dfrac{n\,\mathrm{A}\,v_d}{e}$
3. C.
   $\dfrac{n\,v_d}{e\,\mathrm{A}}$
4. D.
   $n\,e\,v_d$

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

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1. A.
   a circle in x-z plane
2. B.
   a parabola in x-y plane
3. C.
   a helix with constant pitch
4. D.
   a helix with increasing pitch

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1. A.
   both the inductor and the capacitor decreases.
2. B.
   inductor decreases and the capacitor increases.
3. C.
   both the inductor and the capacitor increases.
4. D.
   inductor increases and the capacitor decreases.

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1. A.
   Infrared waves
2. B.
   X-rays
3. C.
   Gamma rays
4. D.
   Ultraviolet rays

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

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1. A.
   half
2. B.
   twice
3. C.
   four times
4. D.
   one-fourth

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

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1. A.
   $0{\cdot}25$ eV
2. B.
   $0{\cdot}51$ eV
3. C.
   $1{\cdot}02$ eV
4. D.
   $0{\cdot}10$ eV

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1. A.
   $\dfrac{11}{9}$
2. B.
   $\dfrac{9}{5}$
3. C.
   $\dfrac{11}{7}$
4. D.
   $\dfrac{16}{7}$

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1. A.
   $3 \times 10^{6}\ \mathrm{m^{-3}}$
2. B.
   $5 \times 10^{7}\ \mathrm{m^{-3}}$
3. C.
   $5 \times 10^{9}\ \mathrm{m^{-3}}$
4. D.
   $6{\cdot}75 \times 10^{38}\ \mathrm{m^{-3}}$

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1. A.
   the potential barrier is lowered.
2. B.
   the potential barrier remains unaffected.
3. C.
   the potential barrier is raised.
4. D.
   the current is mainly due to majority carriers.

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

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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.
   $\mathrm{V}_0$
3. C.
   $\dfrac{\mathrm{V}_0}{2}$
4. D.
   $\sqrt{2}\ \mathrm{V}_0$

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1. A.
   $\dfrac{11}{9}$
2. B.
   $\dfrac{9}{5}$
3. C.
   $\dfrac{11}{7}$
4. D.
   $\dfrac{16}{7}$

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1. A.
   $3 \times 10^{6}\ \mathrm{m^{-3}}$
2. B.
   $5 \times 10^{7}\ \mathrm{m^{-3}}$
3. C.
   $5 \times 10^{9}\ \mathrm{m^{-3}}$
4. D.
   $6{\cdot}75 \times 10^{38}\ \mathrm{m^{-3}}$

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1. A.
   $1{\cdot}12 \times 10^{-14}\ \mathrm{Cm^{-1}}$
2. B.
   $3{\cdot}08 \times 10^{-15}\ \mathrm{Cm^{-1}}$
3. C.
   $1{\cdot}0 \times 10^{-9}\ \mathrm{Cm^{-1}}$
4. D.
   $1{\cdot}0 \times 10^{-7}\ \mathrm{Cm^{-1}}$

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1. A.
   same as that at 0°C
2. B.
   same as that at 300 K
3. C.
   zero
4. D.
   infinite

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1. A.
   $0{\cdot}25$ eV
2. B.
   $0{\cdot}51$ eV
3. C.
   $1{\cdot}02$ eV
4. D.
   $0{\cdot}10$ eV

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1. A.
   increase
2. B.
   decrease
3. C.
   remain same
4. D.
   depend on frequency

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1. A.
   $\Omega\ \mathrm{s^{-1}}$
2. B.
   $\mathrm{m^{2}\,V^{-1}\,s^{-1}}$
3. C.
   $\mathrm{m\,s^{-1}\,V^{-1}}$
4. D.
   $\Omega\ \mathrm{m}$

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1. A.
   both the inductor and the capacitor decreases.
2. B.
   inductor decreases and the capacitor increases.
3. C.
   both the inductor and the capacitor increases.
4. D.
   inductor increases and the capacitor decreases.

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1. A.
   $\tau \propto \mathrm{I}^{3}$
2. B.
   $\tau \propto \mathrm{I}^{2}$
3. C.
   $\tau \propto \mathrm{I}$
4. D.
   $\tau \propto \sqrt{\mathrm{I}}$

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

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

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

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1. A.
   half
2. B.
   twice
3. C.
   four times
4. D.
   one-fourth

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

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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.
   current in the circuit
2. B.
   total resistance of the circuit
3. C.
   emf of the battery
4. D.
   power dissipated in the circuit

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1. A.
   $\dfrac{\mathrm{h}\lambda}{\mathrm{c}^{2}}$
2. B.
   $\dfrac{\mathrm{h}\lambda}{\mathrm{c}}$
3. C.
   $\dfrac{\mathrm{h}}{\lambda}$
4. D.
   zero

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1. A.
   $\dfrac{\mu_0 \mathrm{I}}{2r}$, attractive
2. B.
   $\dfrac{\mu_0 \mathrm{I}^{2}}{2\pi r}$, repulsive
3. C.
   $\dfrac{\mu_0 \mathrm{I}^{2}}{2\pi r}$, attractive
4. D.
   $\dfrac{\mu_0 \mathrm{I}}{2\pi r}$, repulsive

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1. A.
   $2 : 1$
2. B.
   $1 : 2$
3. C.
   $4 : 1$
4. D.
   $8 : 1$

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1. A.
   only displacement current exists.
2. B.
   only conduction current exists.
3. C.
   both displacement current and conduction current exist.
4. D.
   no current exists.

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

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1. A.
   The potential barrier decreases.
2. B.
   Minority carrier injection occurs.
3. C.
   Width of depletion layer increases.
4. D.
   Forward current is due to the diffusion of both holes and electrons.

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

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1. A.
   $0{\cdot}25$ eV
2. B.
   $0{\cdot}51$ eV
3. C.
   $1{\cdot}02$ eV
4. D.
   $0{\cdot}10$ eV

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

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1. A.
   $3 \times 10^{6}\ \mathrm{m^{-3}}$
2. B.
   $5 \times 10^{7}\ \mathrm{m^{-3}}$
3. C.
   $5 \times 10^{9}\ \mathrm{m^{-3}}$
4. D.
   $6{\cdot}75 \times 10^{38}\ \mathrm{m^{-3}}$

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1. A.
   half
2. B.
   twice
3. C.
   four times
4. D.
   one-fourth

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1. A.
   $\dfrac{11}{9}$
2. B.
   $\dfrac{9}{5}$
3. C.
   $\dfrac{11}{7}$
4. D.
   $\dfrac{16}{7}$

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

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1. A.
   both the inductor and the capacitor decreases.
2. B.
   inductor decreases and the capacitor increases.
3. C.
   both the inductor and the capacitor increases.
4. D.
   inductor increases and the capacitor 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.
   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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