List of top Questions asked in Banaras Hindu University Postgraduate Entrance Test

For fission to take place, neutrons must have:
The spacing between two adjacent longitudinal modes in a plane laser resonator having separation between two mirrors, \( d = 10 \) cm, is:
The value of Lande \( g \)-factor for \( ^2P_{3/2} \) state is:
The ground state spectroscopic term for \(^{17}Cl\) atom is:
About Stern-Gerlach Experiment, which one is \textit{not true?}
Using Debye’s theory, atomic heat capacity of a solid at constant volume, \( C_V \) at high temperature is given by:
The orbital magnetic dipole moment of an electron in hydrogen-like atom is \( \sqrt{2} \mu_B \). What is the state of the electron?
Lamb-Rutherford experiment showed that in a hydrogen atom:
The doublet splitting of the first excited state of H-atom due to spin orbit interaction (\(^2 P_{3/2} \rightarrow ^2 P_{1/2}\)) is \(0.365 \text{ cm}^{-1}\). What is the corresponding separation for \(Li^+\) atom?
When a small magnetic field \( H \) is applied to a magnetic material, the intensity of magnetization is proportional to:
In an orthorhombic crystal, a lattice plane cuts intercepts of lengths \( 3a \), \( -2b \), and \( 3c/2 \) along three axes. The Miller indices of the plane are:
Density of states for a one-dimensional Fermi system is proportional to:
If \( E_H \), \( J_x \) and \( B_z \) are the Hall field, current density and magnetic field strength respectively, then Hall coefficient is given by:ॉॉ
The continuous X-ray spectrum is the result of:
The number of molecules present in the unit cell of sodium chloride is:
If the entropy of a system remains constant in a thermodynamic process, the process is known as:
The distribution function \( f(E) \) for a photon gas is given by:
Phase space area of a 1-D SHO with mass \(m\), angular frequency \(\omega\) and having energy between \(E\) and \(2E\) is:
A microcanonical ensemble represents:
If the volume of a cubic unit cell in Bravais lattice is \(V\), the volume of the unit cell in reciprocal lattice will be:
Consider a linear collection of \( N \) independent spin 1/2 particles, each at fixed location. The entropy of the system is:
Consider a system of 3 fermions which can occupy any of the 4 available energy states with equal probability. The entropy of the system is:
The magnetic flux density created by an infinitely long conductor carrying a current \(I\) at a radial distance \(R\) is:
In a radio wave if \(E_0 = 10^{-4} \) V/m, then the magnitude of magnetic field and pointing vector is:
For a two-dimensional free electron gas, the electron density \(n\) and Fermi energy \(E_F\) are related as: