List of practice Questions

The de-Broglie wavelength \( \lambda \) associated with an electron of energy \( V \) electron volt is:
Which of the following is an optically active substance?
Polarization \( \vec{P} \) and electric susceptibility \( \chi \) are related as:
The Clausius-Mossotti relation holds best for:
The polarizability of atoms in the air molecule is \( 9.7 \times 10^{-41} \, \text{cm}^2/\text{V} \). The radius of the atom of an air molecule is:
Using Langevin's theory, the susceptibility \( \chi \) of a paramagnetic substance is given by:
Above Curie temperature, the ferromagnetic material behaves as:
In the diffraction pattern due to a single slit, the width of the central maximum will be:
When a single slit is replaced by a double-slit arrangement, the intensity of the central maximum is increased by:
In a plane transmission grating, the angle of diffraction for the second-order principal maxima for wavelength \( 5000 \) Å is \( 30^\circ \). The number of lines per cm of the grating surface is:
If \( N \) is the total number of rulings on the grating, \( n \) is the order of the spectrum, and \( \lambda \) is the wavelength of light, then the resolving power of the grating is:
The minimum number of lines in a plane diffraction grating required to just resolve the sodium doublet (5890 Å and 5896 Å) in first order is:
Circularly polarized light is produced if the amplitudes of the ordinary and extraordinary rays are equal and there is a phase difference of:
In interference with coherent sources, the fringe width varies as:
In Newton’s rings experiment with two different media between the glass surfaces, the nth rings have diameters as 10:7. The ratio of the refraction indices of two media are:
Broad sources are required in:
A movable mirror of Michelson’s interferometer is moved through a distance of 0.06 mm. If 200 fringes cross the field of view, the wavelength of light is:
The radius of the first zone in a zone plate of focal length 40 cm for light of wavelength 4000 Å is:
Which of the following is not correct for the first order phase transition?
Which of the following statements is correct?
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?
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: