CBSE Class 12 Physics 2023 question paper (55/5)

1. A.
   $4\ \mu\mathrm{C}$
2. B.
   $7\ \mu\mathrm{C}$
3. C.
   $8\ \mathrm{mC}$
4. D.
   $2\ \mathrm{mC}$

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1. A.
   $4.5 \times 10^{-5}$ Nm$^{-1}$, attractive
2. B.
   $4.5 \times 10^{-7}$ N/m, repulsive
3. C.
   $9 \times 10^{-7}$ N/m, repulsive
4. D.
   $9 \times 10^{-5}$ N/m, attractive

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1. A.
   Copper
2. B.
   Aluminium
3. C.
   Copper chloride
4. D.
   Nickel

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1. A.
   0.1 V
2. B.
   0.5 V
3. C.
   0.75 V
4. D.
   1.0 V

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1. A.
   Gamma rays
2. B.
   Microwaves
3. C.
   Visible light
4. D.
   X-rays

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1. A.
   Both (i) and (ii) remain constant.
2. B.
   (i) remains constant, but (ii) decreases.
3. C.
   (i) remains constant, but (ii) increases.
4. D.
   Both (i) and (ii) increase.

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1. A.
   $hc\,\lambda$
2. B.
   $hc/\lambda$
3. C.
   $\lambda/hc$
4. D.
   $\lambda h/c$

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1. A.
   $\dfrac{64}{125}$
2. B.
   $\dfrac{4}{5}$
3. C.
   $\dfrac{5}{4}$
4. D.
   1

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1. A.
   diffusion current keeps increasing.
2. B.
   drift current remains constant.
3. C.
   both the diffusion current and drift current remain constant.
4. D.
   diffusion current remains almost constant but drift current increases till both currents become equal.

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

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

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1. A.
   All three in parallel
2. B.
   All three in series
3. C.
   Two of them connected in series and the combination in parallel to the third.
4. D.
   Two of them connected in parallel and the combination in series to the third.

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1. A.
   If the frequency of the source is increased, the impedance of the circuit first decreases and then increases.
2. B.
   If the net reactance $(X_L - X_C)$ of circuit becomes equal to its resistance, then the current leads the voltage by $45^\circ$.
3. C.
   At resonance, the voltage drop across the inductor is more than that across the capacitor.
4. D.
   At resonance, the voltage drop across the capacitor is more than that across the inductor.

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1. A.
   equal in both the forward and the backward directions.
2. B.
   maximum in the forward direction and zero in the backward direction.
3. C.
   large in the forward direction and small in the backward direction.
4. D.
   small in the forward direction and large in the backward direction.

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

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1. A.
   Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and 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 (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and 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 (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   $\dfrac{Q}{\varepsilon_0}$
2. B.
   $\dfrac{Q}{6\varepsilon_0}$
3. C.
   $\dfrac{Q}{8\varepsilon_0}$
4. D.
   $\dfrac{Q}{3\varepsilon_0}$

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1. A.
   $4.5 \times 10^{-5}$ Nm$^{-1}$, attractive
2. B.
   $4.5 \times 10^{-7}$ N/m, repulsive
3. C.
   $9 \times 10^{-7}$ N/m, repulsive
4. D.
   $9 \times 10^{-5}$ N/m, attractive

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1. A.
   Copper
2. B.
   Aluminium
3. C.
   Copper chloride
4. D.
   Nickel

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1. A.
   0.1 V
2. B.
   0.5 V
3. C.
   0.75 V
4. D.
   1.0 V

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1. A.
   $\lambda_{\text{x-rays}} < \lambda_{\text{micro waves}} < \lambda_{\text{radio waves}} < \lambda_{\text{visible}}$
2. B.
   $\lambda_{\text{visible}} > \lambda_{\text{x-rays}} > \lambda_{\text{radio waves}} > \lambda_{\text{micro waves}}$
3. C.
   $\lambda_{\text{radio wave}} > \lambda_{\text{micro waves}} > \lambda_{\text{visible}} > \lambda_{\text{x-rays}}$
4. D.
   $\lambda_{\text{visible}} < \lambda_{\text{micro waves}} < \lambda_{\text{radio waves}} < \lambda_{\text{x-rays}}$

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1. A.
   Both (i) and (ii) remain constant.
2. B.
   (i) remains constant, but (ii) decreases.
3. C.
   (i) remains constant, but (ii) increases.
4. D.
   Both (i) and (ii) increase.

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1. A.
   $hc\,\lambda$
2. B.
   $hc/\lambda$
3. C.
   $\lambda/hc$
4. D.
   $\lambda h/c$

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1. A.
   $\dfrac{64}{125}$
2. B.
   $\dfrac{4}{5}$
3. C.
   $\dfrac{5}{4}$
4. D.
   1

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1. A.
   diffusion current keeps increasing.
2. B.
   drift current remains constant.
3. C.
   both the diffusion current and drift current remain constant.
4. D.
   diffusion current remains almost constant but drift current increases till both currents become equal.

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

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1. A.
   $\phi_0$
2. B.
   $\dfrac{h}{e}$
3. C.
   $\dfrac{hc}{e}$
4. D.
   $\dfrac{h^2c}{e^2}$

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1. A.
   All three in parallel
2. B.
   All three in series
3. C.
   Two of them connected in series and the combination in parallel to the third.
4. D.
   Two of them connected in parallel and the combination in series to the third.

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1. A.
   is ahead of the voltage in phase by $\pi$.
2. B.
   lags voltage in phase by $\pi$.
3. C.
   is ahead of voltage in phase by $\pi/2$.
4. D.
   lags voltage in phase by $\pi/2$.

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1. A.
   equal in both the forward and the backward directions.
2. B.
   maximum in the forward direction and zero in the backward direction.
3. C.
   large in the forward direction and small in the backward direction.
4. D.
   small in the forward direction and large in the backward direction.

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

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1. A.
   Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and 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 (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and 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 (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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1. A.
   $4\ \mu\mathrm{C}$
2. B.
   $7\ \mu\mathrm{C}$
3. C.
   $8\ \mathrm{mC}$
4. D.
   $2\ \mathrm{mC}$

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1. A.
   zero
2. B.
   $\left(\dfrac{\mu_0 \mathrm{I}}{2\pi r}\right)$ vertically downward
3. C.
   $\left(\dfrac{2\mu_0 \mathrm{I}}{r}\right)$ vertically upward
4. D.
   $\left(\dfrac{\mu_0 \mathrm{I}}{\pi r}\right)$ vertically downward

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1. A.
   Nickel
2. B.
   Silicon
3. C.
   Sodium Chloride
4. D.
   Copper

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1. A.
   0.1 V
2. B.
   0.5 V
3. C.
   0.75 V
4. D.
   1.0 V

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1. A.
   Gamma rays
2. B.
   Microwaves
3. C.
   Visible light
4. D.
   X-rays

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1. A.
   Both (i) and (ii) remain constant.
2. B.
   (i) remains constant, but (ii) decreases.
3. C.
   (i) remains constant, but (ii) increases.
4. D.
   Both (i) and (ii) increase.

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1. A.
   $\dfrac{h\nu}{c^2}$
2. B.
   $h\nu$
3. C.
   $\dfrac{hc}{\mathrm{E}}$
4. D.
   $\dfrac{h\nu}{c}$

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1. A.
   $\dfrac{64}{125}$
2. B.
   $\dfrac{4}{5}$
3. C.
   $\dfrac{5}{4}$
4. D.
   1

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1. A.
   0.01 eV
2. B.
   0.05 eV
3. C.
   0.7 eV
4. D.
   1.1 eV

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

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

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1. A.
   All three in parallel
2. B.
   All three in series
3. C.
   Two of them connected in series and the combination in parallel to the third.
4. D.
   Two of them connected in parallel and the combination in series to the third.

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1. A.
   $\omega^2 \mathrm{LC}$
2. B.
   $\mathrm{LC}^2$
3. C.
   $\dfrac{\mathrm{LC}}{\omega^2}$
4. D.
   $\omega^2 \mathrm{L}$

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1. A.
   420 nm
2. B.
   750 nm
3. C.
   630 nm
4. D.
   500 nm

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

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1. A.
   Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and 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 (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and 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 (R) is the correct explanation of (A).
2. B.
   Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
3. C.
   Assertion (A) is true and Reason (R) is false.
4. D.
   Assertion (A) is false and Reason (R) is also false.

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