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

At \( 4^\circ C \) for water, \( C_P = C_V \) because:
In a ballistic galvanometer, \( \theta_0 \) be the throw in the absence of damping and \( \theta_1 \) be the first throw after \( \frac{T}{4} \) sec (where \( T \) is the time period of oscillations). The correct relation between \( \theta_0 \), \( \theta_1 \) & logarithmic decrement \( \lambda \) of the galvanometer will be:
If two cylinders (one hollow and other solid) of same length, mass, and material are given, then, to twist the cylinders through the same angle:
If in a capillary tube the rate of flow of a liquid is measured by collecting 100 ml of liquid in 100 sec in a measuring flask. If the least count of the volume of the measuring flask be 1 ml and the least count of the stop watch used for measuring the time be 0.01 sec, then the uncertainty in the rate of flow of the liquid will be:
A clock keeps correct time. With what speed should it be moved relative to an observer so that it may seem to lose 20 sec in 100 sec?
With what velocity should an electron move so that its kinetic energy equals its rest mass energy?
Which of the following values of Poisson’s ratio can not be possible?
A particle collides elastically with another particle at rest. If the masses of the particles be \( m_1 \) and \( m_2 \) respectively, then the fraction of kinetic energy transferred to the second will be maximum when:
The acceleration of a frame of reference, fixed on the earth’s surface at the equator and rotating with the earth, once a day will be:
If the volume of a cube of side \( L_0 \) is \( L_0^3 \) as observed by an observer at rest relative to it, the volume as observed from a reference frame moving with uniform velocity \( 0.8c \) in a direction parallel to an edge of the cube will be:
The path of a particle situated on the rim of a wheel moving along a surface (wheel is rotating) as observed by an observer standing on the earth near the wheel will be:
When a wire is stretched to double its length: