CBSE Class 12 Physics 2023 question paper (55/1)

1. A.
   $\dfrac{\vec{F}}{16}$
2. B.
   $\dfrac{\vec{F}}{8}$
3. C.
   $\dfrac{\vec{F}}{4}$
4. D.
   $\dfrac{\vec{F}}{2}$

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1. A.
   A straight line of positive slope, starting on the R-axis at a positive value and rising.
2. B.
   A straight line of positive slope, starting at the origin and rising.
3. C.
   A curve starting on the R-axis at a positive value, falling and flattening as it approaches the T-axis.
4. D.
   A curve starting at the origin and rising with increasing steepness.

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1. A.
   $4\ \Omega$
2. B.
   $3\ \Omega$
3. C.
   $2\ \Omega$
4. D.
   $1\ \Omega$

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1. A.
   A curve falling steeply from a high value and then flattening towards the A-axis without meeting it.
2. B.
   A straight line of negative slope, falling from a high value on the $v_d$-axis to meet the A-axis.
3. C.
   A horizontal straight line at a constant positive value of $v_d$.
4. D.
   A straight line of positive slope, starting at the origin and rising.

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1. A.
   repelled by both the poles.
2. B.
   attracted by both the poles.
3. C.
   repelled by the north pole and attracted by the south pole.
4. D.
   attracted by the north pole and repelled by the south pole.

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1. A.
   $0{\cdot}12$ V
2. B.
   $0{\cdot}15$ V
3. C.
   $0{\cdot}19$ V
4. D.
   $0{\cdot}22$ V

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1. A.
   magnetic field $(\vec{B})$
2. B.
   velocity $(\vec{v})$
3. C.
   resistance (r)
4. D.
   length of PQ

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1. A.
   $\mu_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
2. B.
   $\dfrac{1}{\mu_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$
3. C.
   $\varepsilon_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
4. D.
   $\dfrac{1}{\varepsilon_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$

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

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

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1. A.
   975 nm
2. B.
   740 nm
3. C.
   523 nm
4. D.
   95 nm

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1. A.
   proportional to $A^{1/3}$
2. B.
   proportional to $A^{2/3}$
3. C.
   proportional to $A^{3}$
4. D.
   independent of A

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1. A.
   A full sinusoid — a hump above the t-axis followed by a hump below it, and so on.
2. B.
   A train of humps above the t-axis, each beginning where the previous one ends, with no gap between them.
3. C.
   Humps above the t-axis separated by flat stretches along the t-axis of about the same width as each hump.
4. D.
   A horizontal straight line at a constant positive value of V.

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1. A.
   its resistance increases.
2. B.
   it becomes a p-type semiconductor.
3. C.
   there will be more free electrons than holes in the semiconductor.
4. D.
   dopant atoms become donor atoms.

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1. A.
   10 eV
2. B.
   1 eV
3. C.
   $0{\cdot}1$ eV
4. D.
   $0{\cdot}01$ 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.
   increases in A and decreases in B.
2. B.
   decreases in both A and B.
3. C.
   increases in both A and B.
4. D.
   remains same in both A and B.

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1. A.
   $\mu_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
2. B.
   $\dfrac{1}{\mu_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$
3. C.
   $\varepsilon_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
4. D.
   $\dfrac{1}{\varepsilon_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$

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

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1. A.
   $1{\cdot}75$ eV
2. B.
   $2{\cdot}45$ eV
3. C.
   $3{\cdot}25$ eV
4. D.
   $3{\cdot}75$ eV

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1. A.
   975 nm
2. B.
   740 nm
3. C.
   523 nm
4. D.
   95 nm

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1. A.
   number of neutrons in nucleus.
2. B.
   total number of protons and electrons in the atom.
3. C.
   number of protons in nucleus.
4. D.
   total number of protons and neutrons in nucleus.

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1. A.
   A full sinusoid — a hump above the t-axis followed by a hump below it, and so on.
2. B.
   A train of humps above the t-axis, each beginning where the previous one ends, with no gap between them.
3. C.
   Humps above the t-axis separated by flat stretches along the t-axis of about the same width as each hump.
4. D.
   A horizontal straight line at a constant positive value of V.

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1. A.
   repelled by both the poles.
2. B.
   attracted by both the poles.
3. C.
   repelled by the north pole and attracted by the south pole.
4. D.
   attracted by the north pole and repelled by the south pole.

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1. A.
   $0{\cdot}12$ V
2. B.
   $0{\cdot}15$ V
3. C.
   $0{\cdot}19$ V
4. D.
   $0{\cdot}22$ V

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1. A.
   its resistance increases.
2. B.
   it becomes a p-type semiconductor.
3. C.
   there will be more free electrons than holes in the semiconductor.
4. D.
   dopant atoms become donor atoms.

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1. A.
   10 eV
2. B.
   1 eV
3. C.
   $0{\cdot}1$ eV
4. D.
   $0{\cdot}01$ eV

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1. A.
   A curve falling steeply from a high value and then flattening towards the A-axis without meeting it.
2. B.
   A straight line of negative slope, falling from a high value on the $v_d$-axis to meet the A-axis.
3. C.
   A horizontal straight line at a constant positive value of $v_d$.
4. D.
   A straight line of positive slope, starting at the origin and rising.

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1. A.
   1 : 3
2. B.
   2 : 5
3. C.
   2 : 3
4. D.
   3 : 5

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1. A.
   A straight line of positive slope, starting at the origin and rising.
2. B.
   A straight line of negative slope, falling from a high value on the $\sigma$-axis to meet the T-axis.
3. C.
   A curve starting high on the $\sigma$-axis, falling steeply at first and then flattening towards the T-axis without meeting it.
4. D.
   A curve starting at a positive value of $\sigma$, running almost flat at first and then bending down steeply to meet the T-axis.

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1. A.
   $\dfrac{\vec{F}}{16}$
2. B.
   $\dfrac{\vec{F}}{8}$
3. C.
   $\dfrac{\vec{F}}{4}$
4. D.
   $\dfrac{\vec{F}}{2}$

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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.
   10 eV
2. B.
   1 eV
3. C.
   $0{\cdot}1$ eV
4. D.
   $0{\cdot}01$ eV

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1. A.
   A curve falling steeply from a high value and then flattening towards the A-axis without meeting it.
2. B.
   A straight line of negative slope, falling from a high value on the $v_d$-axis to meet the A-axis.
3. C.
   A horizontal straight line at a constant positive value of $v_d$.
4. D.
   A straight line of positive slope, starting at the origin and rising.

Tap an option to check your answer.

1. A.
   A full sinusoid — a hump above the t-axis followed by a hump below it, and so on.
2. B.
   A train of humps above the t-axis, each beginning where the previous one ends, with no gap between them.
3. C.
   Humps above the t-axis separated by flat stretches along the t-axis of about the same width as each hump.
4. D.
   A horizontal straight line at a constant positive value of V.

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1. A.
   975 nm
2. B.
   740 nm
3. C.
   523 nm
4. D.
   95 nm

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1. A.
   $\mu_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
2. B.
   $\dfrac{1}{\mu_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$
3. C.
   $\varepsilon_0 \dfrac{d\phi_{\mathrm{E}}}{dt}$
4. D.
   $\dfrac{1}{\varepsilon_0} \dfrac{d\phi_{\mathrm{E}}}{dt}$

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1. A.
   $3{\cdot}0$ eV
2. B.
   $4{\cdot}5$ eV
3. C.
   $7{\cdot}5$ eV
4. D.
   $12{\cdot}0$ eV

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1. A.
   $0{\cdot}12$ V
2. B.
   $0{\cdot}15$ V
3. C.
   $0{\cdot}19$ V
4. D.
   $0{\cdot}22$ V

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

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1. A.
   $\dfrac{\vec{F}}{16}$
2. B.
   $\dfrac{\vec{F}}{8}$
3. C.
   $\dfrac{\vec{F}}{4}$
4. D.
   $\dfrac{\vec{F}}{2}$

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1. A.
   $2{\cdot}0$ A
2. B.
   $3{\cdot}4$ A
3. C.
   $4{\cdot}8$ A
4. D.
   $5{\cdot}3$ A

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1. A.
   its resistance increases.
2. B.
   it becomes a p-type semiconductor.
3. C.
   there will be more free electrons than holes in the semiconductor.
4. D.
   dopant atoms become donor atoms.

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1. A.
   repelled by both the poles.
2. B.
   attracted by both the poles.
3. C.
   repelled by the north pole and attracted by the south pole.
4. D.
   attracted by the north pole and repelled by the south pole.

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1. A.
   Glass to air
2. B.
   Glass to water
3. C.
   Diamond to water
4. D.
   Diamond to air

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1. A.
   zero
2. B.
   equal to g
3. C.
   less than g
4. D.
   greater than g

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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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