List of top Physics Questions

Draw (i – δ) curve for a triangular prism and show the angle of minimum deviation.

Amplitude of intensity of magnetic field of an electromagnetic wave in vacuum is 500 nT. What will be the amplitude of the intensity of electric field of the wave?

Write the unit of self-inductance.

Find out the magnetic moment of a rectangular coil of size 20 cm × 10 cm having 10 A current.

A thin transparent sheet is placed in front of one slit of a Young's double slit. The fringe width will:

The unit of \(\dfrac{1}{\mu_0 \varepsilon_0}\) is:

In an AC circuit, if the current \(i = 2\sin\omega t\) ampere and the voltage \(V = 5\cos\omega t\) volt, then the power loss will be:

Two resistors \(R\) and \(2R\) are connected in parallel in an electric circuit. The thermal energies developed in \(R\) and \(2R\) are in the ratio:

The resistance of a wire is 16 ohms. By melting it, the wire is stretched to half of its original length. What will be the resistance of the new wire?

The difference in angular momentum of electron between two successive orbits of hydrogen atom is

Explain Biot-Savart law. Deduce the formula for magnetic field produced due to a straight current carrying conductor.
OR
An α-particle, accelerated with the potential difference of V volt strikes with a nucleus (atomic number = Z). If r be the nearest distance of closest approach to the nucleus then prove that r = 14·4 Z/V Å.

By drawing ray-diagram, explain the formation of image by a compound microscope. Establish the formula for its magnifying power.
OR
What is meant by binding energy of nucleus? Draw the graph of binding energy per nucleon with respect to the mass number. Discuss fission and fusion reactions with the help of this curve.

How is the p-n junction diode used as a full wave rectifier? Explain its working process by making its simple circuit.
OR
What are de Broglie's matter-waves? The work function of potassium is \( 2\!\cdot\!0\ \text{eV} \). When ultraviolet light of wavelength \( 3500\ \text{\AA} \) falls on the surface of potassium, calculate the maximum kinetic energy of the emitted photoelectrons in electron-volt.

Obtain the formula for the magnetic field inside a current carrying solenoid with the help of Ampere's circuital law.
OR
Obtain the formula for moment of couple acting on a magnetic dipole in a magnetic field. Define magnetic dipole moment with the help of this.

Deduce the formula of equivalent capacity of three condensers connected in parallel.

What do you mean by eddy current? How does it affect the energy losses? Write the uses of eddy current.

An equiconcave lens of crown glass has to be formed. What should be the radii of the surfaces of the lens so that the power of the lens is \(-2.5\,\text{D}\)? The refractive index of crown glass is \(1.65\).

Resistance of a wire is 16 ohm. By melting it, its length is stretched to half of its original length. What will be the resistance of the new wire?

Write Ohm's law. Deduce Ohm's law on the basis of drift velocity of electron.

The wavelength of first line of Balmer series of hydrogen atom is \( 6563\ \text{\AA} \). Determine the wavelength of second line.
OR
What do you mean by polarization of light? How are unpolarized and plane polarized lights represented? Which nature of light waves is proved by polarization?

A convex lens of glass of focal length 15 cm is immersed in carbon disulphide. In this situation what will be the focal length and the nature of the lens? The refractive indices of glass and carbon disulphide (relative to air) are 3/2 and 5/3 respectively.

Write the difference between isotopic, isobaric and isotonic nuclei. Give an example of each.

Explain the motion of a charged particle in a uniform magnetic field. Prove that the radius of the path of a charged particle moving perpendicular to a uniform magnetic field is proportional to the momentum of the particle.