List of top Physics Questions

"If two systems are each in thermal equilibrium with a third system, they are also in thermal equilibrium with each other." This statement refers to :
State and prove the law of conservation of angular momentum.
Explain the classification of conductors, insulators and semiconductors on the basis of energy bands.
State and prove Kirchhoff's law of heat radiation.
What do you understand by polarized light ? When a third polaroid is rotated between two crossed polaroids, then discuss the change in the intensity of the transmitted light.
A lamp “50 watt and 100 volt” is to be connected to AC mains of 200 volt 50 Hz. Calculate the capacity of condenser required in series of lamp.
What do you mean by total internal reflection ? Show it by drawing ray diagram.
Find the maximum kinetic energy of the photo-electrons ejected, when light of wavelength 3300 Å is incident on a Cesium surface. Work function of Cesium = 1.9 eV.
For a Zener diode as shown in the circuit diagram below, the Zener voltage \(V_Z\) is 3.7 V. For a load resistance (\(R_L\)) of 1 k\(\Omega\), a current \(I_1\) flows through the load. If \(R_L\) is decreased to 500 \(\Omega\), the current changes to \(I_2\). The ratio \(\frac{I_2}{I_1}\) is \rule{1cm{0.15mm}. (up to two decimal places)}
What is Curie temperature?
The graph between voltage \( V \) of a conductor and current \( I \) is a straight line, which makes an angle \( \theta \) with the y-axis (which represents \( I \)). The resistance of the conductor will be
Equivalent energy of 1 amu is
At \( T = 27^\circ C \), \( V_i = 0.4 \, \text{L} \), \( V_f = 0.8 \, \text{L} \), find isothermal work.
Given \( n \) turns, current \( I \), permeability, and diameter, find magnetisation.
For \( V = 120 \, \text{V} \), find the resonant current \( I_0 \).
What is \( C_v \) for a monoatomic gas?
What is the magnetic field at the centre of a current-carrying loop?
For mass 20 kg, torque \( \tau = 5 \, \text{Nm} \), find angular acceleration \( \alpha \).
What is the ratio of the de Broglie wavelengths for an electron and a proton if both have equal kinetic energy?
Given \( E(t) = 108t - 22 \), how is velocity derived from the electric field?
Apply the mirror formula if focal length \( f = l \, \text{m} \) and object distance \( u = 15 \, \text{m}.\)
How can energy losses in a transformer be minimised?
If current drops from 4 A to 0 A in 0.5 s, and voltage is 120 V, find the self-inductance.
For a microscope with objective \( f_o = 1 \, \text{cm} \), eyepiece \( f_e = 10 \, \text{cm} \), and image distance \( v = 25 \, \text{cm} \), find total magnification.
What is the Bohr radius of a hydrogen atom?