Physics Test - ...

A narrow beam of protons and deuterons, each having the same momentum, enters a region of uniform magnetic field directed perpendicular to their direction of momentum. The ratio of the radii of the circular paths described by them is:

The mean free path of gas molecules is proportional to \(n ^{\text {th }}\) power of diameter of molecules. Here \(n\) is:

Two sine waves having unequal amplitudes and a phase difference of \(\frac{\pi}{2}\), are travelling along \(\mathrm{x}\) and \(\mathrm{y}\)-axis respectively. When they superimpose, the resultant wave will be:

Let the length of a potentiometer wire be \(10 {~cm}\) and cell of emf \(E\) is balanced at a length \(\frac{10 }{ 3} {~cm}\) from the positive end of the wire. If the length of the wire is increased by \(5 {~cm},\) at what distance (in \({cm}\) ) from positive end will the same cell give a balance point?

The potential energy between electron and proton is given by \(\mathrm{U}=\frac{\mathrm{Ke}^{2}}{3 \mathrm{r}^{3}}\). According to Bohr's theory, the energy in the \(n^{\text {th }}\) orbit of such a hypothetical atom will be proportional to:

The solids which have the negative temperature coefficient of resistance are:

Calculate the displacement current between square plates in which electric field changes at the rate of \(5 \times 10^{12} {Vm}^{-1} {~s}^{-1}\). Side of plates is \(2.0 {~cm}\).

Which one of the following affects the efficiency of oil transportation through pipeline?

The energy equivalent of \(0.5 \mathrm{~g}\) of a substance is