List of top Physics Questions

Derive an expression for the potential energy of a charged capacitor.
What is resistance? Define SI unit of resistance.
What is displacement current?
What are the factors which reduce the efficiency of a transformer?
Calculate the resistivity of the material of a conductor of length 3 m, area of cross section \( 0.2 \, \text{mm}^2 \) having a resistance of 2 \( \Omega \).
Calculate the Coulomb’s force between proton and electron separated by a distance of \( 0.8 \times 10^{-15} \) m.
Derive an expression for magnetic force. How is the direction of magnetic force determined?
Define threshold wavelength and frequency.
Calculate the de-Broglie wavelength for electrons moving with speed of \( 10^5 \, \text{m/s} \).
The density of nuclear matter is independent of the size of the nucleus. (T/F)
Write an expression for mass defect.
Why can’t two equipotential surfaces intersect each other?
The size of the mirror does not affect the nature of the image. (T/F)
The laws of electromagnetic induction have been used in the construction of:
Diffraction of light is the phenomenon of bending of light around the corners of an aperture in its path. (T/F)
The ultimate individual unit of magnetism in any magnet is:
Wheatstone bridge is used to measure:
The strength of a bar magnet is maximum at its center. (T/F)
A semiconductor is a device that obeys Ohm's law. (T/F)
In the Bohr model of the hydrogen atom, the lowest orbit corresponds to:
Applying forward bias in a p-n junction, the potential barrier:
On doping, the conductivity of a semiconductor:
If a dielectric is kept between two plates of a capacitor, its capacitance:
When the distance between the charges is halved, the force between the charges becomes:
Velocity of light is maximum in: