CBSE Class 12 Physics 2024 question paper (55/2)

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

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

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1. A.
   $0{\cdot}7$ Am$^2$
2. B.
   $1{\cdot}54$ Am$^2$
3. C.
   $2{\cdot}10$ Am$^2$
4. D.
   $3{\cdot}5$ Am$^2$

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1. A.
   $0{\cdot}314\ \mu\mathrm{Wb}$
2. B.
   $3{\cdot}14\ \mu\mathrm{Wb}$
3. C.
   $31{\cdot}4\ \mu\mathrm{Wb}$
4. D.
   $1{\cdot}256\ \mu\mathrm{Wb}$

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1. A.
   Current only
2. B.
   Voltage only
3. C.
   Power only
4. D.
   Magnetic flux and Power both

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1. A.
   $100\sqrt{2}$ V
2. B.
   100 V
3. C.
   $50\sqrt{2}$ V
4. D.
   50 V

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

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1. A.
   150 nm
2. B.
   200 nm
3. C.
   375 nm
4. D.
   500 nm

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1. A.
   $\lambda_1^2 + \lambda_2^2 = \lambda_3^2$
2. B.
   $\dfrac{1}{\lambda_1} + \dfrac{1}{\lambda_2} = \dfrac{1}{\lambda_3}$
3. C.
   $\lambda_1 + \lambda_2 + \lambda_3 = 0$
4. D.
   $\lambda_1 + \lambda_2 = \lambda_3$

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

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1. A.
   Al
2. B.
   B
3. C.
   P
4. D.
   In

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1. A.
   the barrier height decreases and the depletion region widens.
2. B.
   the barrier height increases and the depletion region widens.
3. C.
   the barrier height decreases and the depletion region shrinks.
4. D.
   the barrier height increases and the depletion region shrinks.

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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.
   The potential difference (V) between the two terminals of a cell in a closed circuit is always less than its emf $\varepsilon$, during discharge of the cell.
2. B.
   The internal resistance of a cell decreases with the decrease in temperature of the electrolyte.
3. C.
   When current is drawn from the cell then $V = \varepsilon - Ir$.
4. D.
   The graph between potential difference between the two terminals of the cell (V) and the current (I) through it is a straight line with a negative slope.

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

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1. A.
   $\varepsilon = V_+ + V_- > 0$
2. B.
   $\varepsilon = V_+ - V_- > 0$
3. C.
   $\varepsilon = V_+ + V_- < 0$
4. D.
   $\varepsilon = V_+ + V_- = 0$

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1. A.
   $0{\cdot}05$ A
2. B.
   $0{\cdot}1$ A
3. C.
   $0{\cdot}15$ A
4. D.
   $0{\cdot}2$ A

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

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1. A.
   $0^\circ$
2. B.
   $< 90^\circ$
3. C.
   $> 90^\circ$
4. D.
   $90^\circ$

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1. A.
   400 nm
2. B.
   450 nm
3. C.
   600 nm
4. D.
   800 nm

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

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1. A.
   $\sin^{-1}\dfrac{1}{2}$
2. B.
   $\sin^{-1}\dfrac{4}{5}$
3. C.
   $\sin^{-1}\dfrac{3}{5}$
4. D.
   $\sin^{-1}\dfrac{2}{5}$

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1. A.
   $\sin^{-1}\sqrt{n^2 - 1}$
2. B.
   $\sin^{-1}(n^2 - 1)$
3. C.
   $\sin^{-1}\left[\dfrac{1}{\sqrt{n^2 - 1}}\right]$
4. D.
   $\sin^{-1}\left[\dfrac{1}{(n^2 - 1)}\right]$

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

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

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1. A.
   $\varepsilon_1 > \varepsilon_2 > \varepsilon_3$
2. B.
   $\varepsilon_2 > \varepsilon_3 > \varepsilon_1$
3. C.
   $\varepsilon_3 > \varepsilon_1 > \varepsilon_2$
4. D.
   $\varepsilon_1 > \varepsilon_3 > \varepsilon_2$

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1. A.
   $0{\cdot}314\ \mu\mathrm{Wb}$
2. B.
   $3{\cdot}14\ \mu\mathrm{Wb}$
3. C.
   $31{\cdot}4\ \mu\mathrm{Wb}$
4. D.
   $1{\cdot}256\ \mu\mathrm{Wb}$

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1. A.
   Current only
2. B.
   Voltage only
3. C.
   Power only
4. D.
   Magnetic flux and Power both

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1. A.
   $\dfrac{10^5}{4\pi}$ Hz
2. B.
   $\dfrac{10^5}{2\pi}$ Hz
3. C.
   $\dfrac{10^4}{4\pi}$ Hz
4. D.
   $\dfrac{10^4}{2\pi}$ Hz

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

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1. A.
   $0{\cdot}54$ eV
2. B.
   $1{\cdot}07$ eV
3. C.
   $1{\cdot}61$ eV
4. D.
   $2{\cdot}14$ eV

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1. A.
   $\lambda_1^2 + \lambda_2^2 = \lambda_3^2$
2. B.
   $\dfrac{1}{\lambda_1} + \dfrac{1}{\lambda_2} = \dfrac{1}{\lambda_3}$
3. C.
   $\lambda_1 + \lambda_2 + \lambda_3 = 0$
4. D.
   $\lambda_1 + \lambda_2 = \lambda_3$

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

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1. A.
   Al
2. B.
   B
3. C.
   P
4. D.
   In

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1. A.
   the barrier height decreases and the depletion region widens.
2. B.
   the barrier height increases and the depletion region widens.
3. C.
   the barrier height decreases and the depletion region shrinks.
4. D.
   the barrier height increases and the depletion region shrinks.

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.
   $0^\circ$
2. B.
   $< 90^\circ$
3. C.
   $> 90^\circ$
4. D.
   $90^\circ$

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1. A.
   400 nm
2. B.
   450 nm
3. C.
   600 nm
4. D.
   800 nm

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

Tap an option to check your answer.

1. A.
   $\sin^{-1}\dfrac{1}{2}$
2. B.
   $\sin^{-1}\dfrac{4}{5}$
3. C.
   $\sin^{-1}\dfrac{3}{5}$
4. D.
   $\sin^{-1}\dfrac{2}{5}$

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1. A.
   $\sin^{-1}\sqrt{n^2 - 1}$
2. B.
   $\sin^{-1}(n^2 - 1)$
3. C.
   $\sin^{-1}\left[\dfrac{1}{\sqrt{n^2 - 1}}\right]$
4. D.
   $\sin^{-1}\left[\dfrac{1}{(n^2 - 1)}\right]$

Tap an option to check your answer.

1. A.
   The potential difference (V) between the two terminals of a cell in a closed circuit is always less than its emf $\varepsilon$, during discharge of the cell.
2. B.
   The internal resistance of a cell decreases with the decrease in temperature of the electrolyte.
3. C.
   When current is drawn from the cell then $V = \varepsilon - Ir$.
4. D.
   The graph between potential difference between the two terminals of the cell (V) and the current (I) through it is a straight line with a negative slope.

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A.
   $\varepsilon = V_+ + V_- > 0$
2. B.
   $\varepsilon = V_+ - V_- > 0$
3. C.
   $\varepsilon = V_+ + V_- < 0$
4. D.
   $\varepsilon = V_+ + V_- = 0$

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1. A.
   $0{\cdot}05$ A
2. B.
   $0{\cdot}1$ A
3. C.
   $0{\cdot}15$ A
4. D.
   $0{\cdot}2$ A

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

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

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

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1. A.
   Area of the coil
2. B.
   Resistance of the coil
3. C.
   Number of turns in the coil
4. D.
   Angular speed of rotation of the coil

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1. A.
   $0{\cdot}314\ \mu\mathrm{Wb}$
2. B.
   $3{\cdot}14\ \mu\mathrm{Wb}$
3. C.
   $31{\cdot}4\ \mu\mathrm{Wb}$
4. D.
   $1{\cdot}256\ \mu\mathrm{Wb}$

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1. A.
   Current only
2. B.
   Voltage only
3. C.
   Power only
4. D.
   Magnetic flux and Power both

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

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

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1. A.
   $4 \times 10^{-27}$
2. B.
   $8 \times 10^{-28}$
3. C.
   $2 \times 10^{-30}$
4. D.
   $6 \times 10^{-29}$

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1. A.
   Al
2. B.
   B
3. C.
   P
4. D.
   In

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1. A.
   $\lambda_1^2 + \lambda_2^2 = \lambda_3^2$
2. B.
   $\dfrac{1}{\lambda_1} + \dfrac{1}{\lambda_2} = \dfrac{1}{\lambda_3}$
3. C.
   $\lambda_1 + \lambda_2 + \lambda_3 = 0$
4. D.
   $\lambda_1 + \lambda_2 = \lambda_3$

Tap an option to check your answer.

1. A.
   the barrier height decreases and the depletion region widens.
2. B.
   the barrier height increases and the depletion region widens.
3. C.
   the barrier height decreases and the depletion region shrinks.
4. D.
   the barrier height increases and the depletion region shrinks.