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#1 Class 12 Physics Nuclei 2023 Long 1M

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

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

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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#4 Class 12 Physics Current Electricity 2026 Long 1M

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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#5 Class 12 Physics Atoms 2026 Mcq 1M

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

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

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

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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#9 Class 12 Physics Electromagnetic Waves 2023 Mcq 1M

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

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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#11 Class 12 Physics Electromagnetic Induction 2023 Mcq 1M

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

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

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

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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#15 Class 12 Physics Nuclei 2023 Mcq 1M

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

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

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

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

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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#20 Class 12 Physics Wave Optics 2023 Mcq 1M

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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