CBSE Class 12 Physics 2026 question paper (55/1)

1. A.
   10 N/C along $+x$
2. B.
   10 N/C along $-x$
3. C.
   50 N/C along $+x$
4. D.
   50 N/C along $-x$

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1. A.
   $\frac{r_1}{r_2}$
2. B.
   $\frac{r_2}{r_1}$
3. C.
   $\frac{r_1^2}{r_2^2}$
4. D.
   $\frac{r_2^2}{r_1^2}$

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1. A.
   Zero
2. B.
   $\frac{\mu_0 I}{2\pi a}$
3. C.
   $\frac{\mu_0 I}{4\pi a}$
4. D.
   $\frac{\mu_0 I}{6\pi a}$

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1. A.
   straight
2. B.
   parabolic
3. C.
   circular
4. D.
   hyperbolic

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1. A.
   wavelength is doubled and frequency remains unchanged.
2. B.
   wavelength is doubled and frequency is halved.
3. C.
   wavelength is halved and frequency remains unchanged.
4. D.
   wavelength and frequency both will remain unchanged.

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1. A.
   10 V
2. B.
   $5\sqrt{2}$ V
3. C.
   $\frac{5}{\sqrt{2}}$ V
4. D.
   $10\sqrt{2}$ V

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1. A.
   1 nm to $10^{-3}$ nm
2. B.
   400 nm to 1 nm
3. C.
   1 mm to 700 nm
4. D.
   0.1 m to 1 mm

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

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1. A.
   20 cm
2. B.
   30 cm
3. C.
   40 cm
4. D.
   5 cm

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1. A.
   (i) and (iii) only
2. B.
   (iii) and (iv) only
3. C.
   (i), (iii) and (iv) only
4. D.
   All of them

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1. A.
   $(P_1 + P_2)$
2. B.
   $\frac{P_1 + P_2}{2}$
3. C.
   $\frac{P_1 P_2}{2(P_1 + P_2)}$
4. D.
   $\frac{P_1 P_2}{4(P_1 + P_2)}$

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1. A.
   Diffusion current is zero but drift current exists.
2. B.
   Diffusion current exists but drift current is zero.
3. C.
   Diffusion and drift currents are equal and opposite.
4. D.
   Both the diffusion and drift currents exist but are unequal.

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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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are false.

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1. A.
   use of soft iron core which increases the magnetic field.
2. B.
   radial magnetic field
3. C.
   hair spring which provides the counter torque
4. D.
   eddy current in the iron core which causes damping.

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1. A.
   increasing number of turns of the coil
2. B.
   increasing area of coil and magnitic field strength
3. C.
   decreasing area of coil and magnetic field strength
4. D.
   increasing torsional constant of the hair spring

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1. A.
   1.0 N m
2. B.
   2.0 N m
3. C.
   0.50 N m
4. D.
   0.25 N m

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1. A.
   4015 $\Omega$
2. B.
   3985 $\Omega$
3. C.
   415 $\Omega$
4. D.
   385 $\Omega$

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1. A.
   0.05 $\Omega$ should be connected in series with it.
2. B.
   0.05 $\Omega$ should be connected in parallel with it.
3. C.
   0.01 $\Omega$ should be connected in parallel with it.
4. D.
   0.01 $\Omega$ should be connected in series with it.

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1. A.
   $\nu_1$ and $\nu_2$
2. B.
   $V_1$ and $V_2$
3. C.
   $h\nu_1$ and $h\nu_2$
4. D.
   $\frac{h\nu_1}{e}$ and $\frac{h\nu_2}{e}$

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1. A.
   greater for metal A because it has a smaller work function.
2. B.
   greater for metal B because it has a larger work function.
3. C.
   greater for metal B because it has higher threshold frequency.
4. D.
   the same for both metal A and metal B because it is independent of work functions of metals.

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1. A.
   the slope of the parallel lines will increase.
2. B.
   the slope of the parallel lines will decrease.
3. C.
   the threshold frequencies for both A and B will decrease.
4. D.
   the slope of the parallel lines will not change but more electrons will be emitted per second.

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

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1. A.
   me
2. B.
   $\frac{1}{me}$
3. C.
   $\frac{m}{e}$
4. D.
   $\frac{e}{m}$

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1. A.
   -16 V
2. B.
   16 V
3. C.
   - 8 V
4. D.
   8 V

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1. A.
   Diffusion current is zero but drift current exists.
2. B.
   Diffusion current exists but drift current is zero.
3. C.
   Diffusion and drift currents are equal and opposite.
4. D.
   Both the diffusion and drift currents exist but are unequal.

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

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1. A.
   (i) and (iii) only
2. B.
   (iii) and (iv) only
3. C.
   (i), (iii) and (iv) only
4. D.
   All of them

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1. A.
   zero
2. B.
   $\frac{20}{3}$ cm
3. C.
   $-\frac{20}{3}$ cm
4. D.
   $\frac{40}{3}$ cm

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

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

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1. A.
   $\frac{r_1}{r_2}$
2. B.
   $\frac{r_2}{r_1}$
3. C.
   $\frac{r_1^2}{r_2^2}$
4. D.
   $\frac{r_2^2}{r_1^2}$

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1. A.
   $(1\ \mathrm{nT})\ \hat{j}$
2. B.
   $(10\ \mathrm{nT})\ \hat{k}$
3. C.
   $-(10\ \mathrm{nT})\ \hat{k}$
4. D.
   $-(1\ \mathrm{nT})\ \hat{j}$

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1. A.
   distance between the slits and the screen only
2. B.
   wavelength of light used only
3. C.
   both wavelength of light used and the slits separation
4. D.
   slits separation only

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1. A.
   wavelength is doubled and frequency remains unchanged.
2. B.
   wavelength is doubled and frequency is halved.
3. C.
   wavelength is halved and frequency remains unchanged.
4. D.
   wavelength and frequency both will remain unchanged.

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1. A.
   6 V
2. B.
   8 V
3. C.
   10 V
4. D.
   16 V

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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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are false.

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1. A.
   $\nu_1$ and $\nu_2$
2. B.
   $V_1$ and $V_2$
3. C.
   $h\nu_1$ and $h\nu_2$
4. D.
   $\frac{h\nu_1}{e}$ and $\frac{h\nu_2}{e}$

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1. A.
   greater for metal A because it has a smaller work function.
2. B.
   greater for metal B because it has a larger work function.
3. C.
   greater for metal B because it has higher threshold frequency.
4. D.
   the same for both metal A and metal B because it is independent of work functions of metals.

Tap an option to check your answer.

1. A.
   the slope of the parallel lines will increase.
2. B.
   the slope of the parallel lines will decrease.
3. C.
   the threshold frequencies for both A and B will decrease.
4. D.
   the slope of the parallel lines will not change but more electrons will be emitted per second.

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

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1. A.
   me
2. B.
   $\frac{1}{me}$
3. C.
   $\frac{m}{e}$
4. D.
   $\frac{e}{m}$

Tap an option to check your answer.

1. A.
   use of soft iron core which increases the magnetic field.
2. B.
   radial magnetic field
3. C.
   hair spring which provides the counter torque
4. D.
   eddy current in the iron core which causes damping.

Tap an option to check your answer.

1. A.
   increasing number of turns of the coil
2. B.
   increasing area of coil and magnitic field strength
3. C.
   decreasing area of coil and magnetic field strength
4. D.
   increasing torsional constant of the hair spring

Tap an option to check your answer.

1. A.
   1.0 N m
2. B.
   2.0 N m
3. C.
   0.50 N m
4. D.
   0.25 N m

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1. A.
   4015 $\Omega$
2. B.
   3985 $\Omega$
3. C.
   415 $\Omega$
4. D.
   385 $\Omega$

Tap an option to check your answer.

1. A.
   0.05 $\Omega$ should be connected in series with it.
2. B.
   0.05 $\Omega$ should be connected in parallel with it.
3. C.
   0.01 $\Omega$ should be connected in parallel with it.
4. D.
   0.01 $\Omega$ should be connected in series with it.

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1. A.
   (i) and (iii) only
2. B.
   (iii) and (iv) only
3. C.
   (i), (iii) and (iv) only
4. D.
   All of them

Tap an option to check your answer.

1. A.
   wavelength is doubled and frequency remains unchanged.
2. B.
   wavelength is doubled and frequency is halved.
3. C.
   wavelength is halved and frequency remains unchanged.
4. D.
   wavelength and frequency both will remain unchanged.

Tap an option to check your answer.

1. A.
   Diffusion current is zero but drift current exists.
2. B.
   Diffusion current exists but drift current is zero.
3. C.
   Diffusion and drift currents are equal and opposite.
4. D.
   Both the diffusion and drift currents exist but are unequal.

Tap an option to check your answer.

1. A.
   $\frac{r_1}{r_2}$
2. B.
   $\frac{r_2}{r_1}$
3. C.
   $\frac{r_1^2}{r_2^2}$
4. D.
   $\frac{r_2^2}{r_1^2}$

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1. A.
   45°
2. B.
   90°
3. C.
   135°
4. D.
   315°

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1. A.
   $0.15\, \frac{\mathrm{V}}{\mathrm{m}}$
2. B.
   $0.30\, \frac{\mathrm{V}}{\mathrm{m}}$
3. C.
   $1.5\, \frac{\mathrm{V}}{\mathrm{m}}$
4. D.
   $3.0\, \frac{\mathrm{V}}{\mathrm{m}}$

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1. A.
   $u < \frac{R}{2}$
2. B.
   $\frac{R}{2} < u < R$
3. C.
   $R < u < 2R$
4. D.
   $u > 2R$

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

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

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1. A.
   $2\pi I$, along +X – axis
2. B.
   $2\pi I$ along –X – axis
3. C.
   $\pi I$ along +X – axis
4. D.
   $\pi I$ along –X – axis

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1. A.
   longitudinal mechanical wave only
2. B.
   transverse mechanical wave only
3. C.
   electromagnetic waves only
4. D.
   all these waves

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1. A.
   0.30
2. B.
   0.45
3. C.
   0.50
4. D.
   0.60

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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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are 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.
   Both Assertion (A) and Reason (R) are false.

Tap an option to check your answer.

1. A.
   use of soft iron core which increases the magnetic field.
2. B.
   radial magnetic field
3. C.
   hair spring which provides the counter torque
4. D.
   eddy current in the iron core which causes damping.

Tap an option to check your answer.

1. A.
   increasing number of turns of the coil
2. B.
   increasing area of coil and magnitic field strength
3. C.
   decreasing area of coil and magnetic field strength
4. D.
   increasing torsional constant of the hair spring

Tap an option to check your answer.

1. A.
   1.0 N m
2. B.
   2.0 N m
3. C.
   0.50 N m
4. D.
   0.25 N m

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1. A.
   4015 $\Omega$
2. B.
   3985 $\Omega$
3. C.
   415 $\Omega$
4. D.
   385 $\Omega$

Tap an option to check your answer.

1. A.
   0.05 $\Omega$ should be connected in series with it.
2. B.
   0.05 $\Omega$ should be connected in parallel with it.
3. C.
   0.01 $\Omega$ should be connected in parallel with it.
4. D.
   0.01 $\Omega$ should be connected in series with it.

Tap an option to check your answer.

1. A.
   $\nu_1$ and $\nu_2$
2. B.
   $V_1$ and $V_2$
3. C.
   $h\nu_1$ and $h\nu_2$
4. D.
   $\frac{h\nu_1}{e}$ and $\frac{h\nu_2}{e}$