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#1 Class 12 Physics Dual Nature of Radiation and Matter 2024 Mcq 1M

Which one of the following is the correct graph between the maximum kinetic energy ($K_m$) of the emitted photoelectrons and the frequency ($\nu$) of incident radiation, for a given photosensitive surface?

A. A declining straight line from the $K_m$-axis to the $\nu$-axis

B. A line starting above the origin at $\nu=0$, rising linearly

C. A straight line starting on the $\nu$-axis at some $\nu_0>0$ and rising linearly

D. A straight line through the origin, rising linearly

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#2 Class 12 Physics Atoms 2024 Mcq 1M

A proton and an alpha particle, having equal velocities, approach a target nucleus. They come momentarily to rest and reverse their directions. Find the ratio of the distance of closest approach of the proton to that ...

A. 1/2

B. 2

C. 1/4

D. 4

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#3 Class 12 Physics Electromagnetic Waves 2024 Mcq 1M

Which one of the following has the highest frequency — Infrared rays, Gamma rays, Radio waves, or Microwaves?

A. Infrared rays

B. Gamma rays

C. Radio waves

D. Microwaves

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#4 Class 12 Physics Electromagnetic Induction 2024 Mcq 1M

Consider a solenoid of length $l$ and area of cross-section $A$ with a fixed number of turns. The self-inductance of the solenoid will increase if:

A. both $l$ and A are increased

B. $l$ is decreased and A is increased

C. $l$ is increased and A is decreased

D. both $l$ and A are decreased

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#5 Class 12 Physics Electromagnetic Induction 2024 Mcq 1M

The current in a coil of 15 mH increases uniformly from zero to 4 A in 0.004 s. Find the emf induced in the coil.

A. 22.5 V

B. 17.5 V

C. 15.0 V

D. 12.5 V

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#6 Class 12 Physics Moving Charges and Magnetism 2024 Mcq 1M

A current-carrying circular loop of magnetic moment $M$ is suspended in a vertical plane in an external magnetic field $\vec B$ such that its plane is normal to $\vec B$. Find the work done in rotating this loop by $4...

A. $-0.3\ MB$

B. $0.3\ MB$

C. $-1.7\ MB$

D. $1.7\ MB$

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#7 Class 12 Physics Moving Charges and Magnetism 2024 Mcq 1M

A circular loop of wire, carrying a current $I$, lies in the x-y plane with its centre coinciding with the origin. It is subjected to a uniform magnetic field pointing along the +z-axis. What will the loop do?

A. move along x-axis

B. move along −y-axis

C. move along z-axis

D. remain stationary

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#8 Class 12 Physics Moving Charges and Magnetism 2024 Mcq 1M

A 2.0 cm segment of wire, carrying 5.0 A current in the positive y-direction, lies along the y-axis (near the origin). Find the magnetic field at the point (3 m, 4 m, 0) due to this segment.

A. $(0.12\ nT)\hat j$

B. $-(0.10\ nT)\hat j$

C. $-(0.24\ nT)\hat k$

D. $(0.24\ nT)\hat k$

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#9 Class 12 Physics Electrostatic Potential and Capacitance 2024 Mcq 1M

A proton is taken from point $P_1$ to point $P_2$, both located in an electric field. The potentials at $P_1$ and $P_2$ are $-5$ V and $+5$ V respectively. Assuming the kinetic energies of the proton at $P_1$ and $P_2...

A. $-1.6\times10^{-18}$ J

B. $1.6\times10^{-18}$ J

C. Zero

D. $0.8\times10^{-18}$ J

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#10 Class 12 Physics Electrostatic Potential and Capacitance 2024 Mcq 1M

Consider a group of charges $q_1,q_2,q_3,\ldots$ such that $\Sigma q \ne 0$. What are the equipotentials at a large distance from this group, approximately?

A. Plane

B. Spherical surface

C. Paraboloidal surface

D. Ellipsoidal surface

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#11 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 1M

Assertion (A): The magnifying power of a compound microscope is negative. Reason (R): The final image formed is erect with respect to the object.

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#12 Class 12 Physics Moving Charges and Magnetism 2024 Long 1M

Assertion (A): An electron and a proton enter a uniform magnetic field $\vec B$ with the same momentum $p$, such that $\vec p\perp\vec B$. They move in circular paths of the same radius. Reason (R): In a magnetic fiel...

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#13 Class 12 Physics Electromagnetic Induction 2024 Long 1M

Assertion (A): Lenz's law is a consequence of the law of conservation of energy. Reason (R): There is no power loss in an ideal inductor.

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#14 Class 12 Physics Dual Nature of Radiation and Matter 2024 Long 1M

Assertion (A): For a given frequency, the photoelectric current increases with an increase in the intensity of the incident radiation. Reason (R): As intensity increases, the number of photoelectrons emitted per secon...

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#15 Class 12 Physics Semiconductor 2024 Mcq 1M

When a p-n junction diode is subjected to reverse biasing, what happens to the barrier height and the depletion region width?

A. barrier height decreases, depletion region widens

B. barrier height increases, depletion region widens

C. barrier height decreases, depletion region shrinks

D. barrier height increases, depletion region shrinks

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#16 Class 12 Physics Semiconductor 2024 Mcq 1M

An n-type semiconducting Si is obtained by doping intrinsic Si with:

A. Al

B. B

C. P

D. In

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#17 Class 12 Physics Atoms 2024 Mcq 1M

In the Geiger-Marsden experiment, an alpha particle approaches a gold nucleus with kinetic energy $K$. It momentarily stops at a distance $d$ from the nucleus and reverses its direction. To what is $d$ proportional?

A. $1/\sqrt K$

B. $\sqrt K$

C. $1/K$

D. $K$

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#18 Class 12 Physics Atoms 2024 Mcq 1M

Energy levels A, B and C of an atom correspond to increasing values of energy, i.e. $E_A<E_B<E_C$. Let $\lambda_1,\lambda_2,\lambda_3$ be the wavelengths of radiation corresponding to the transitions C to B, B to A, a...

A. $\lambda_1^2+\lambda_2^2=\lambda_3^2$

B. $\dfrac1{\lambda_1}+\dfrac1{\lambda_2}=\dfrac1{\lambda_3}$

C. $\lambda_1+\lambda_2+\lambda_3=0$

D. $\lambda_1+\lambda_2=\lambda_3$

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#19 Class 12 Physics Dual Nature of Radiation and Matter 2024 Mcq 1M

The work function for a photosensitive surface is 3.315 eV. Find the cut-off wavelength for photoemission of electrons from this surface.

A. 150 nm

B. 200 nm

C. 375 nm

D. 500 nm

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#20 Class 12 Physics Electromagnetic Waves 2024 Mcq 1M

Electromagnetic waves with wavelength 10 nm are called:

A. Infrared waves

B. Ultraviolet rays

C. Gamma rays

D. X-rays

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