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#1 Class 12 Physics Electromagnetic Induction 2023 Short 3M

State Faraday's law of electromagnetic induction. Briefly describe two methods for producing induced emf.

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#2 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M

A ray of light is incident at an angle of $45^\circ$ on one face of a prism with an equilateral triangular base. If it passes symmetrically through the prism, find: (a) the angle of minimum deviation, and (b) the refr...

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#3 Class 12 Physics Alternating Current 2026 Short 3M

A series combination of circuit elements X and Y is connected across an ac source. The voltage is ahead of the current in phase by $\frac{\pi}{4}$ radian. When element Y is replaced by element Z, the current leads the...

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#4 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M

Define the term 'critical angle'. A small bulb is placed at the bottom of a tank containing a liquid of refractive index $\mu$ at a depth $H$. Light emerges from a circular area of radius $r$ at the surface. Obtain th...

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#5 Class 12 Physics Nuclei 2023 Short 3M

Differentiate between nuclear fission and nuclear fusion. Give one example of each with the nuclear reaction.

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#6 Class 12 Physics Ray Optics and Optical Instruments 2023 Short 3M

A ray of light is travelling through a rectangular glass slab (refractive index $\frac{3}{2}$) and is incident on the horizontal glass-air surface at the critical angle for the two media. The slab is then brought in c...

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#7 Class 12 Physics Electromagnetic Waves 2023 Short 3M

(a) Depict the variation of electric field ($\vec{E}$) and magnetic field ($\vec{B}$) with respect to the direction of propagation of an electromagnetic wave. Write their two important characteristics. (b) Show that $...

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#8 Class 12 Physics Alternating Current 2026 Short 3M

(a) Discuss the behaviour of an inductor connected to (i) a dc source, and (ii) a high frequency ac source. (b) What is the phase relation between current and voltage in an ideal inductor connected to an ac source? Dr...

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#9 Class 12 Physics Moving Charges and Magnetism 2023 Short 3M

An alpha particle (mass $6.4\times10^{-27}$ kg and charge $3.2\times10^{-19}$ C) having 8.0 MeV energy enters a region of a uniform magnetic field of 0.5 T directed perpendicular to its velocity. Find the radius of th...

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#10 Class 12 Physics Moving Charges and Magnetism 2023 Short 3M

A circular coil of 30 turns and radius 8.0 cm carrying a current of 6 A is suspended vertically in a uniform horizontal magnetic field of 1.0 T. The field lines make an angle of $30^\circ$ with the plane of the coil. ...

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#11 Class 12 Physics Current Electricity 2026 Short 3M

(a) Establish the relation between drift velocity of electrons ($v_d$) and electric current ($I$) in a conductor. (b) How is $v_d$ affected when the length of the conductor is doubled, keeping the voltage applied acro...

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#12 Class 12 Physics Wave Optics 2023 Short 2M

In Young's double slit experiment, the central maximum is bright in the interference pattern obtained on a screen. What will happen when: (a) light waves emitted from slits $S_1$ and $S_2$ have an initial phase differ...

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

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

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

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

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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#17 Class 12 Physics Nuclei 2023 Short 2M

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

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#18 Class 12 Physics Wave Optics 2023 Short 2M

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

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#19 Class 12 Physics Current Electricity 2026 Short 2M

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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#20 Class 12 Physics Current Electricity 2026 Short 2M

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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