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#1 Class 12 Physics Electric Charges and Fields 2026 Mcq 1M CBSE

An electric dipole $\vec{P}=2qa\,\hat{i}$ is placed in the x-y plane, centred at the origin. Let $E_1$ and $E_2$ be the magnitudes of the electric field at a point distant $r\,(\gg a)$ from its centre, along its axis ...

A. $\dfrac{1}{4}$

B. $\dfrac{1}{2}$

C. 2

D. 4

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#2 Class 12 Physics Ray Optics and Optical Instruments 2023 Mcq 1M CBSE

An equiconvex lens of focal length 15 cm is cut into two equal plano-convex halves. The focal length of each half will be:

A. 30 cm

B. 20 cm

C. 15 cm

D. 7.5 cm

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#3 Class 12 Physics Nuclei 2023 Mcq 1M CBSE

If $r_1$ and $r_2$ are the radii of atomic nuclei of mass numbers 64 and 27 respectively, then the value of $\left(\dfrac{r_1}{r_2}\right)$ is:

A. 1

B. $\dfrac{4}{3}$

C. $\dfrac{3}{4}$

D. $\dfrac{27}{64}$

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#4 Class 12 Physics Dual Nature of Radiation and Matter 2023 Mcq 1M CBSE

A proton and an alpha particle have equal momentum. The ratio of their kinetic energies $(E_p/E_\alpha)$ and de Broglie wavelengths associated with them $(\lambda_p/\lambda_\alpha)$ respectively are:

A. 2, 1

B. 1, 2

C. 4, 1

D. 1, 4

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#5 Class 12 Physics Dual Nature of Radiation and Matter 2023 Mcq 1M CBSE

Radiation of wavelength 200 nm is incident on a photosensitive surface of work function 4.2 eV. The kinetic energy of fastest photoelectrons emitted from this surface will be close to:

A. 3.5 eV

B. 3.0 eV

C. 2.5 eV

D. 2.0 eV

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#6 Class 12 Physics Ray Optics and Optical Instruments 2023 Mcq 1M CBSE

In which of the following, total internal reflection does NOT occur?

A. Twinkling of stars

B. Brilliance of diamonds

C. Optical fibre

D. Reflecting prism

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#7 Class 12 Physics Ray Optics and Optical Instruments 2023 Mcq 1M CBSE

A telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6.0 cm. The magnifying power and the length of telescope tube will be respectively:

A. 24, 150 cm

B. 42, 138 cm

C. 24, 138 cm

D. 42, 150 cm

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#8 Class 12 Physics Wave Optics 2023 Mcq 1M CBSE

The phase difference between the two superimposing waves that give rise to a bright spot (constructive interference) in a Young's double-slit experiment is ($n$ is an integer):

A. $2n\pi$

B. $2n\pi+\dfrac{\pi}{4}$

C. $2n\pi+\dfrac{\pi}{2}$

D. $2n\pi+\pi$

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#9 Class 12 Physics Ray Optics and Optical Instruments 2023 Mcq 1M CBSE

A thin plano-convex lens and a thin equi-concave lens are kept coaxially in contact. Both lenses are made of glass of refractive index $\mu$, and $R$ is the radius of curvature of each curved surface. The focal length...

A. $\dfrac{R}{\mu-1}$

B. $-\dfrac{R}{\mu-1}$

C. $\dfrac{2R}{\mu-1}$

D. $-\dfrac{2R}{\mu-1}$

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#10 Class 12 Physics Electromagnetic Waves 2023 Mcq 1M CBSE

A plane electromagnetic wave travels through a medium and the magnetic field associated with it is given by $B = 5\times10^{-8}\sin(3\times10^{10}t - 150x)$ T, where $x$ is in metres and $t$ is in seconds. The velocit...

A. $2.0\times10^{8}$ ms$^{-1}$

B. $4.5\times10^{7}$ ms$^{-1}$

C. $3.5\times10^{7}$ ms$^{-1}$

D. $2.5\times10^{8}$ ms$^{-1}$

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#11 Class 12 Physics Electromagnetic Induction 2023 Mcq 1M CBSE

A square loop of side 50 cm is placed in a uniform magnetic field of 3.0 T acting perpendicular to the plane of the loop. If the loop is rotated through an angle of $90^\circ$ in 0.3 s, the value of emf induced in the...

A. 0.25 V

B. 0.50 V

C. 0.75 V

D. 1.0 V

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#12 Class 12 Physics Electric Charges and Fields 2026 Mcq 1M CBSE

A particle of mass $m$ and charge $q$ starts from rest and moves in an electric field $\vec{E} = E_0\hat{i}$. After travelling a distance $x$ in the field along the x-axis, the kinetic energy of the particle will be:

A. $qE_0x^2$

B. $qE_0x$

C. $q^2E_0x$

D. $q^2E_0^2x$

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#13 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

[Case Study — Young's Double Slit Experiment] The principle of superposition is used to understand the phenomenon of interference of light waves. It states that at a particular point, the resultant displacement produc...

A. It remains constant in both cases.

B. It decreases in both cases.

C. It remains constant in (i) but decreases in (ii).

D. It decreases in (i) but remains constant in (ii).

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#14 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

[Case Study — Young's Double Slit Experiment] The principle of superposition is used to understand the phenomenon of interference of light waves. It states that at a particular point, the resultant displacement produc...

A. 480 nm

B. 560 nm

C. 640 nm

D. 680 nm

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#15 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

[Case Study — Young's Double Slit Experiment] The principle of superposition is used to understand the phenomenon of interference of light waves. It states that at a particular point, the resultant displacement produc...

A. $\omega_2>\omega_1>\omega_3$

B. $\omega_1>\omega_2>\omega_3$

C. $\omega_2>\omega_3>\omega_1$

D. $\omega_3>\omega_1>\omega_2$

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#16 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

[Case Study — Young's Double Slit Experiment] The principle of superposition is used to understand the phenomenon of interference of light waves. It states that at a particular point, the resultant displacement produc...

A. Zero

B. $I_0$

C. $2I_0$

D. $4I_0$

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#17 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE

[Case Study — Young's Double Slit Experiment] The principle of superposition is used to understand the phenomenon of interference of light waves. It states that at a particular point, the resultant displacement produc...

A. (i) and (ii)

B. (ii) and (iii)

C. (iii) and (iv)

D. (iv) and (i)

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#18 Class 12 Physics Wave Optics 2022 Short 3M CBSE

(i) Monochromatic light is incident on a surface separating two media. The frequency of the light after refraction remains unaffected but its wavelength changes. Why? (ii) The frequency of an electromagnetic radiation...

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#19 Class 12 Physics Dual Nature of Radiation and Matter 2022 Short 3M CBSE

Photoelectrons are emitted from a metal surface when illuminated with UV light of wavelength 330 nm. The minimum amount of energy required to emit the electrons from the surface is $3.5 \times 10^{-19}$ J. Calculate: ...

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#20 Class 12 Physics Ray Optics and Optical Instruments 2022 Short 3M CBSE

For a glass prism of refractive index $\sqrt{3}$, the value of angle of minimum deviation $\delta$ is equal to the angle of prism A. Find the angle of prism A. How will the angle $\delta$ be affected if the prism were...

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