List of top Physics Questions

Draw the logic symbol of a NOR gate and write its truth table.
The work function of a metal is \( 2.5 \times 10^{-9} \) joule. If the metal is exposed to a light beam of frequency \( 6.0 \times 10^{14} \) Hz, what will be the stopping potential?
Obtain the formula for the electric potential on the axial line of an electric dipole.
Calculate the energy of a \( \text{He}^+ (Z = 2) \) in its first excited state.
The net resistance of an ammeter should be small to ensure that:
Write the minimum orbital angular momentum of the electron in a hydrogen atom.
How much energy is released in mass defect of 1 amu?
The electric field of intensity \( \vec{E} = (3 \hat{i} + 4 \hat{j}) \, \text{N/C} \) passes through the plane of area \( \vec{A} = (10 \hat{i}) \, \text{m}^2 \). Find the electric flux.
In a transistor:
As compared to \(^{12}_6C\) atom, how many extra protons and neutrons does the \(^{14}_6C\) atom have?
Define optical centre of a lens.
The equation \( E = pc \), where \( E \), \( p \), and \( c \) represent energy, momentum, and velocity of light, is valid:
What is the meaning of wavefront? Explain the laws of reflection by explaining Huygens' principle of wavefront.
The equivalent resistance of the network shown in figure between A and B is:
What do you understand by electromagnetic induction? State Faraday’s laws regarding electromagnetic induction.
What is LED? Explain its principle, construction and working.
As the temperature of a metal and of a semiconductor is increased, the:
Explain both the laws of Kirchhoff of electrical circuits.
Derive the formula for the capacitance of a parallel plate capacitor, partially filled with a dielectric.
Obtain the formula for refractive index of material of prism in terms of angle of minimum deviation and angle of prism.
What is the meaning of matter-wave of Louis de Broglie? Deduce the relation for wavelength of de Broglie in terms of kinetic energy.
Explain Bohr's model of the atom.
What is a transistor? By drawing the circuit diagram of common emitter configuration, plot the output characteristics.
The energy of an electron of excited hydrogen atom is -3.4 eV. Determine the angular momentum of the electron.
Define the formula for the resonant frequency in a series L-C-R alternating current circuit.