CBSE Class 12 Physics 2023 question paper (55/4)

1. A.
   $\dfrac{1}{4\pi\varepsilon_0}\,\dfrac{q_1 q_2}{d^2}$
2. B.
   $\dfrac{1}{4\pi\varepsilon_0}\,\dfrac{q_1 q_2}{(d - r_1)^2}$
3. C.
   Zero
4. D.
   $\dfrac{1}{4\pi\varepsilon_0}\,\dfrac{q_1 q_2}{[d - (r_1 + r_2)]^2}$

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

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1. A.
   Copper
2. B.
   Iron
3. C.
   Sodium
4. D.
   Aluminium

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1. A.
   P
2. B.
   Q
3. C.
   R
4. D.
   S

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

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

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1. A.
   $1{\cdot}5$ eV
2. B.
   $1{\cdot}7$ eV
3. C.
   $3{\cdot}2$ eV
4. D.
   $4{\cdot}7$ eV

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1. A.
   They are stronger than Coulomb forces.
2. B.
   They have about the same magnitude for different pairs of nucleons.
3. C.
   They are always attractive.
4. D.
   They saturate as the separation between two nucleons increases.

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1. A.
   along abc if I decreases
2. B.
   along acb if I increases
3. C.
   along abc if I is constant
4. D.
   along abc if I increases

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1. A.
   X is a capacitor and $X_C = \sqrt{2}\,R$
2. B.
   X is an inductor and $X_L = R$
3. C.
   X is an inductor and $X_L = \sqrt{2}\,R$
4. D.
   X is a capacitor and $X_C = R$

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

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

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1. A.
   $-3{\cdot}4$ eV
2. B.
   $-3{\cdot}02$ eV
3. C.
   $-1{\cdot}51$ eV
4. D.
   $-6{\cdot}8$ eV

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1. A.
   3 u
2. B.
   $3{\cdot}5$ u
3. C.
   7 u
4. D.
   21 u

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1. A.
   Forward biasing, 0 A
2. B.
   Reverse biasing, 0 A
3. C.
   Forward biasing, 5 mA
4. D.
   Reverse biasing, 2 mA

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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.
   P
2. B.
   Q
3. C.
   R
4. D.
   S

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

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

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

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1. A.
   They are stronger than Coulomb forces.
2. B.
   They have about the same magnitude for different pairs of nucleons.
3. C.
   They are always attractive.
4. D.
   They saturate as the separation between two nucleons increases.

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1. A.
   Zero
2. B.
   $\dfrac{q\lambda}{2\pi\,\varepsilon_0\,r}$
3. C.
   $\dfrac{q\lambda}{4\pi\,\varepsilon_0\,r}$
4. D.
   $\dfrac{q\lambda}{\varepsilon_0\,r}$

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1. A.
   Zero
2. B.
   $9{\cdot}27 \times 10^{-24}$ C/kg
3. C.
   $8{\cdot}8 \times 10^{10}$ C/kg
4. D.
   $6{\cdot}6 \times 10^{-12}$ C/kg

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1. A.
   Nickel
2. B.
   Aluminium
3. C.
   Lead
4. D.
   Iron

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1. A.
   3 u
2. B.
   $3{\cdot}5$ u
3. C.
   7 u
4. D.
   21 u

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1. A.
   Forward biasing, 0 A
2. B.
   Reverse biasing, 0 A
3. C.
   Forward biasing, 5 mA
4. D.
   Reverse biasing, 2 mA

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1. A.
   along abc if I decreases
2. B.
   along acb if I increases
3. C.
   along abc if I is constant
4. D.
   along abc if I increases

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1. A.
   X is a capacitor and $X_C = \sqrt{2}\,R$
2. B.
   X is an inductor and $X_L = R$
3. C.
   X is an inductor and $X_L = \sqrt{2}\,R$
4. D.
   X is a capacitor and $X_C = R$

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

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

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1. A.
   $-3{\cdot}4$ eV
2. B.
   $-3{\cdot}02$ eV
3. C.
   $-1{\cdot}51$ eV
4. D.
   $-6{\cdot}8$ eV

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

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1. A.
   2K
2. B.
   more than 2K
3. C.
   between K and 2K
4. D.
   less than K

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1. A.
   They are stronger than Coulomb forces.
2. B.
   They have about the same magnitude for different pairs of nucleons.
3. C.
   They are always attractive.
4. D.
   They saturate as the separation between two nucleons increases.

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1. A.
   $\dfrac{1}{4\pi\,\varepsilon_0\,m}\left(\dfrac{q}{v}\right)$
2. B.
   $\dfrac{1}{4\pi\,\varepsilon_0\,m}\left(\dfrac{q}{v}\right)^2$
3. C.
   $\dfrac{m}{4\pi\,\varepsilon_0}\left(\dfrac{q}{v}\right)$
4. D.
   $\dfrac{m}{4\pi\,\varepsilon_0}\left(\dfrac{q}{v}\right)^2$

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1. A.
   $1{\cdot}5$ eV
2. B.
   $1{\cdot}7$ eV
3. C.
   $3{\cdot}2$ eV
4. D.
   $4{\cdot}7$ eV

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1. A.
   Aluminium
2. B.
   Alnico
3. C.
   Water
4. D.
   Sodium

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1. A.
   P
2. B.
   Q
3. C.
   R
4. D.
   S

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1. A.
   Radio waves
2. B.
   Microwaves
3. C.
   X-rays
4. D.
   Infrared waves

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

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

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1. A.
   along abc if I decreases
2. B.
   along acb if I increases
3. C.
   along abc if I is constant
4. D.
   along abc if I increases

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1. A.
   X is a capacitor and $X_C = \sqrt{2}\,R$
2. B.
   X is an inductor and $X_L = R$
3. C.
   X is an inductor and $X_L = \sqrt{2}\,R$
4. D.
   X is a capacitor and $X_C = R$

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1. A.
   Forward biasing, 0 A
2. B.
   Reverse biasing, 0 A
3. C.
   Forward biasing, 5 mA
4. D.
   Reverse biasing, 2 mA

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1. A.
   $-3{\cdot}4$ eV
2. B.
   $-3{\cdot}02$ eV
3. C.
   $-1{\cdot}51$ eV
4. D.
   $-6{\cdot}8$ eV

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1. A.
   3 u
2. B.
   $3{\cdot}5$ u
3. C.
   7 u
4. D.
   21 u

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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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