CBSE Class 12 Physics 2023 question paper (55/2)

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

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

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1. A.
   1445 J
2. B.
   1536 J
3. C.
   1569 J
4. D.
   1640 J

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1. A.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{E}}\right)\mathrm{R}$
2. B.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{R}}\right)$
3. C.
   $\dfrac{(\mathrm{E} - \mathrm{V})\,\mathrm{R}}{\mathrm{I}}$
4. D.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{V}}\right)\mathrm{R}$

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1. A.
   attract each other.
2. B.
   repel each other.
3. C.
   neither attract nor repel.
4. D.
   force of attraction or repulsion depends upon speed of beams.

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

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

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1. A.
   Energy carried
2. B.
   Speed
3. C.
   Frequency
4. D.
   Wavelength

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1. A.
   230 nm
2. B.
   345 nm
3. C.
   460 nm
4. D.
   690 nm

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1. A.
   Rubidium
2. B.
   Sodium
3. C.
   Cadmium
4. D.
   Caesium

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1. A.
   $\dfrac{8}{7}\lambda$
2. B.
   $\dfrac{16}{7}\lambda$
3. C.
   $\dfrac{24}{7}\lambda$
4. D.
   $\dfrac{32}{7}\lambda$

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1. A.
   radioactive
2. B.
   unstable
3. C.
   easily fissionable
4. D.
   more stable nucleus than its neighbours

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1. A.
   $1.8 \times 10^{9}$ m$^{-3}$
2. B.
   $2.4 \times 10^{10}$ m$^{-3}$
3. C.
   $3.6 \times 10^{9}$ m$^{-3}$
4. D.
   $3.2 \times 10^{10}$ m$^{-3}$

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1. A.
   both increases.
2. B.
   both decreases.
3. C.
   copper increases and silicon decreases.
4. D.
   copper decreases and silicon increases.

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1. A.
   movement of dopant atoms
2. B.
   diffusion of both electrons and holes
3. C.
   drift of electrons only
4. D.
   drift of holes only

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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 Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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 Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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.
   1
2. B.
   $\dfrac{1}{c}$
3. C.
   $c$
4. D.
   $\dfrac{1}{c^2}$

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1. A.
   n = 3 to n = 1
2. B.
   n = 3 to n = 2
3. C.
   n = 4 to n = 1
4. D.
   n = 4 to n = 2

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1. A.
   Energy carried
2. B.
   Speed
3. C.
   Frequency
4. D.
   Wavelength

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1. A.
   movement of dopant atoms
2. B.
   diffusion of both electrons and holes
3. C.
   drift of electrons only
4. D.
   drift of holes only

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

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1. A.
   radioactive
2. B.
   unstable
3. C.
   easily fissionable
4. D.
   more stable nucleus than its neighbours

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1. A.
   $4.0 \times 10^{16}$
2. B.
   $5.0 \times 10^{17}$
3. C.
   $1.6 \times 10^{16}$
4. D.
   $1.0 \times 10^{17}$

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1. A.
   Ge
2. B.
   C
3. C.
   Si
4. D.
   Pb

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1. A.
   1.8 W
2. B.
   2.4 W
3. C.
   3.6 W
4. D.
   7.2 W

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1. A.
   $1.8 \times 10^{9}$ m$^{-3}$
2. B.
   $2.4 \times 10^{10}$ m$^{-3}$
3. C.
   $3.6 \times 10^{9}$ m$^{-3}$
4. D.
   $3.2 \times 10^{10}$ m$^{-3}$

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1. A.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{E}}\right)\mathrm{R}$
2. B.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{R}}\right)$
3. C.
   $\dfrac{(\mathrm{E} - \mathrm{V})\,\mathrm{R}}{\mathrm{I}}$
4. D.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{V}}\right)\mathrm{R}$

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1. A.
   $3.0 \times 10^{-20}$ J
2. B.
   $6.0 \times 10^{-20}$ J
3. C.
   $4.5 \times 10^{-20}$ J
4. D.
   $9.0 \times 10^{-20}$ J

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1. A.
   attract each other.
2. B.
   repel each other.
3. C.
   neither attract nor repel.
4. D.
   force of attraction or repulsion depends upon speed of beams.

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1. A.
   1.4
2. B.
   1.5
3. C.
   1.6
4. D.
   1.8

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

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1. A.
   Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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 Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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 Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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.
   $\dfrac{1}{2}$
2. B.
   1
3. C.
   2
4. D.
   4

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1. A.
   $6.64 \times 10^{-20}$ J
2. B.
   $5.18 \times 10^{-19}$ J
3. C.
   $3.0 \times 10^{-19}$ J
4. D.
   $2.0 \times 10^{-20}$ J

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1. A.
   moving with a constant velocity
2. B.
   moving with a constant speed parallel to a magnetic field
3. C.
   moving with an acceleration
4. D.
   at rest

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1. A.
   intrinsic semiconductor
2. B.
   p-type semiconductor
3. C.
   n-type semiconductor
4. D.
   p-n junction diode

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1. A.
   movement of dopant atoms
2. B.
   diffusion of both electrons and holes
3. C.
   drift of electrons only
4. D.
   drift of holes only

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1. A.
   $\dfrac{5}{3}\mathrm{R}$
2. B.
   $\left(\dfrac{13}{53}\right)^{1/3}\mathrm{R}$
3. C.
   $\left(\dfrac{5}{3}\mathrm{R}\right)^{1/3}$
4. D.
   $\left(\dfrac{13}{53}\mathrm{R}\right)^{1/3}$

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1. A.
   $2.2 \times 10^{3}$ Vm$^{-1}$
2. B.
   $1.2 \times 10^{4}$ Vm$^{-1}$
3. C.
   $3.0 \times 10^{4}$ Vm$^{-1}$
4. D.
   $4.2 \times 10^{3}$ Vm$^{-1}$

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1. A.
   $1.8 \times 10^{9}$ m$^{-3}$
2. B.
   $2.4 \times 10^{10}$ m$^{-3}$
3. C.
   $3.6 \times 10^{9}$ m$^{-3}$
4. D.
   $3.2 \times 10^{10}$ m$^{-3}$

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1. A.
   $\dfrac{\mathrm{q}_0\mathrm{Q}}{4\pi\varepsilon_0 a}$
2. B.
   $\dfrac{\mathrm{q}_0\mathrm{Q}}{8\pi\varepsilon_0 a}$
3. C.
   $\dfrac{\mathrm{q}_0\mathrm{Q}}{4\pi\varepsilon_0 a^2}$
4. D.
   $\dfrac{\mathrm{q}_0\mathrm{Q}}{8\pi\varepsilon_0 a^2}$

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1. A.
   radioactive
2. B.
   unstable
3. C.
   easily fissionable
4. D.
   more stable nucleus than its neighbours

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1. A.
   10 mC
2. B.
   18 mC
3. C.
   27 mC
4. D.
   54 mC

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1. A.
   1.33
2. B.
   1.50
3. C.
   1.65
4. D.
   1.75

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1. A.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{E}}\right)\mathrm{R}$
2. B.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{R}}\right)$
3. C.
   $\dfrac{(\mathrm{E} - \mathrm{V})\,\mathrm{R}}{\mathrm{I}}$
4. D.
   $\left(\dfrac{\mathrm{E} - \mathrm{V}}{\mathrm{V}}\right)\mathrm{R}$

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1. A.
   Energy carried
2. B.
   Speed
3. C.
   Frequency
4. D.
   Wavelength

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1. A.
   attract each other.
2. B.
   repel each other.
3. C.
   neither attract nor repel.
4. D.
   force of attraction or repulsion depends upon speed of beams.

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 Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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 Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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 Reason (R) is the correct explanation of Assertion (A).
2. B.
   Both Assertion (A) and Reason (R) are true and Reason (R) is NOT the correct explanation of Assertion (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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