List of top Physics Questions

What is the meaning of nucleon? What is the mass number of nucleus? Write down the relation between mass number and radius of nucleus and show that the density of nucleus does not depend on mass number.
Write Huygens' principle of secondary wavelets and explain the laws of refraction of light on its basis.
Energy of electron in the \(n\)th orbit of hydrogen atom is \( E_n = \frac{-13.6}{n^2} \, \text{eV} \). Draw the energy level diagram for hydrogen atom and show the transition for lines of Balmer and Paschen series.
Derive Lens Maker's formula for a thin lens. Mention the effect of the refractive index and radius of curvature of the curved surfaces on the focal length of the lens.
Write down Biot-Savart law and find the expression for the magnetic field produced by a current-carrying conductor of infinite length, on the basis of it.
Write Kirchhoff's law for electrical circuits. In the given balanced Wheatstone bridge, find the potential at points B and D and the values of current \(i_1\) and \(i_2\). \includegraphics[width=0.5\linewidth]{image6.png}
Describe a series L, C, R resonant circuit.
What are matter waves? Explain. Write the formula for de Broglie wavelength. Write the name of the experiment which shows the dual nature of particles.
Define electric dipole and give the formula for its dipole moment. Find the expression of torque acting on an electric dipole placed in a uniform electric field.
Mention the major drawbacks of Rutherford's atomic model.
Four capacitors of equal capacity are connected in series with a battery of 20 V. The middle point O is earthed. Calculate the potential at points P and Q. \includegraphics[width=0.5\linewidth]{image3.png}
Draw a circuit diagram to obtain characteristic curve in forward bias of p-n junction diode. Mention the effect of forward bias on depletion layer of the junction.
Temperature of a pure semiconductor is $0\ \mathrm{K$. Comment on its conductivity.}
In a single-slit diffraction pattern, the angle of diffraction for the second minimum is $60^\circ$. Find the width of the slit in terms of $\lambda$.
State and prove Ampere's circuital law.
Explain the meaning of polarisation of light and show the difference between polarised and unpolarised light with the help of a suitable diagram.
Self-inductance of a coil is 6 mH and the rate of flow of current in it is $10^3$ A/s. Find the induced emf produced in the coil.
Write the unit of electric flux.
Define electromotive force of a cell.
Prism angle of a prism is $A$ and angle of minimum deviation is equal to prism angle. Refractive index of the material of prism will be:
The unit of magnetic dipole moment is
Threshold wavelength for a metal surface is 2000 \AA. On incidence of radiation of 1000 \AA, the kinetic energy of emitted photoelectrons will be
To measure potential difference from a galvanometer, we connect in it:
In electromagnetic waves, phase difference between electric and magnetic field vectors is:
Charge on a piece of metal is \(-3.2\) coulomb. Number of excess electrons in the metal is: