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#1 Class 12 Physics Dual Nature of Radiation and Matter 2023 Short 2M CBSE

Light of frequency $5.0\times10^{14}$ Hz is incident on a metal surface. If the maximum speed of photoelectrons emitted is $6.63\times10^{5}$ ms$^{-1}$, calculate the threshold frequency for the surface.

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

Draw a labelled ray diagram of an astronomical telescope when the final image is formed at infinity (normal adjustment). Write the expression for its magnifying power.

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#3 Class 12 Physics Dual Nature of Radiation and Matter 2023 Short 2M CBSE

Calculate the de Broglie wavelength of a neutron having kinetic energy of 150 eV. (Mass of neutron $=1.675\times10^{-27}$ kg)

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#4 Class 12 Physics Dual Nature of Radiation and Matter 2023 Short 2M CBSE

A particle of mass $M$ at rest splits up into two particles of masses $m_1$ and $m_2$ having non-zero velocities. Calculate the ratio of the de Broglie wavelengths associated with the two particles.

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#5 Class 12 Physics Nuclei 2023 Short 2M CBSE

Explain the terms mass defect and binding energy. How are they related?

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#6 Class 12 Physics Wave Optics 2023 Short 2M CBSE

Explain why diffraction of sound is more common in daily experience than that of light.

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#7 Class 12 Physics Current Electricity 2026 Short 2M CBSE

A battery of emf 21 V and internal resistance $3\,\Omega$ is connected to a resistor. If the current in the circuit is 3 A, find: (i) the resistance of the resistor, (ii) the terminal voltage of the battery.

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#8 Class 12 Physics Current Electricity 2026 Short 2M CBSE

In the given figure, a steady current $I$ flows through the circuit when points A and C are connected by a wire of negligible resistance. The circuit has $E_1=6$ V with $1\,\Omega$ and $E_2=4$ V with $3\,\Omega$ (B is...

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#9 Class 12 Physics Nuclei 2023 Long 1M CBSE

Assertion (A): Nuclear forces are always attractive. Reason (R): The nuclear force between protons and neutrons in a nucleus is a weak force.

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#10 Class 12 Physics Dual Nature of Radiation and Matter 2023 Long 1M CBSE

Assertion (A): Photoelectric current depends upon the intensity of the incident radiation. Reason (R): Stopping potential is independent of the intensity of the incident radiation.

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#11 Class 12 Physics Moving Charges and Magnetism 2023 Long 1M CBSE

Assertion (A): The cylindrical soft iron core in a moving coil galvanometer only makes the magnetic field radial and does not affect the strength of the magnetic field. Reason (R): In a moving coil galvanometer, the p...

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#12 Class 12 Physics Current Electricity 2026 Long 1M CBSE

Assertion (A): In a Wheatstone bridge circuit, if we interchange the position of the cell and the galvanometer, the balance condition $\dfrac{P}{Q}=\dfrac{R}{S}$ remains unchanged. Reason (R): $\dfrac{P}{Q}=\dfrac{R}{...

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#13 Class 12 Physics Atoms 2026 Mcq 1M CBSE

The ratio of the de Broglie wavelengths associated with the electron revolving in the first and third orbits in a hydrogen atom is:

A. 2

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

C. 3

D. $\dfrac{1}{3}$

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

A ray of yellow light undergoes total internal reflection when incident at the interface of two media. This ray is successively replaced by blue, green and red lights at the same angle of incidence. Which statement is...

A. TIR occurs for blue light only

B. TIR occurs for red light only

C. TIR occurs for both green and blue lights

D. None will undergo TIR

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

An electric dipole with dipole moment $\vec{P}=(2.54\times10^{-28}\,\text{C·m})(2.00\hat{i}+3.00\hat{j})$ is placed in an electric field $\vec{E}=\left(1000\,\dfrac{N}{C}\right)\hat{i}$. An external agent turns the di...

A. $2.54\times10^{-25}$ J

B. $1.27\times10^{-24}$ J

C. $1.02\times10^{-23}$ J

D. $2.29\times10^{-26}$ J

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#16 Class 12 Physics Moving Charges and Magnetism 2023 Mcq 1M CBSE

A square loop of side $L$ lies in the x-y plane in a magnetic field $\vec{B}=B_0(2\hat{i}+3\hat{j}+4\hat{k})$, where $B_0$ is a constant. The magnetic flux through the loop is:

A. $\sqrt{29}\,B_0L^2$

B. $4B_0L^2$

C. $3B_0L^2$

D. $2B_0L^2$

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

A ray of monochromatic light travelling in air is incident on a glass slab and is partly reflected and partly refracted. Both the reflected and refracted lights will have:

A. same wavelength

B. same frequency

C. same intensity

D. same speed

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

The velocity of the photoelectrons emitted from a surface depends upon the:

A. Wavelength of incident radiation only

B. Intensity of incident radiation only

C. Work function of the surface only

D. Both wavelength of the incident radiation and work function of the surface

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

A metallic rod of 1 m length is rotated with a frequency of 40 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through t...

A. 20 V

B. 32 V

C. 40 V

D. 63 V

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

A plano-convex lens, made of glass ($n=1.5$), has a curved surface whose radius is 40 cm. The image formed of an object is of the same size as that of the object. The distance of the object from the lens is:

A. 40 cm

B. 80 cm

C. 160 cm

D. 200 cm

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