$A$ closed compartment containing gas is moving with some acceleration in the horizontal direction. Neglect the effect of gravity. Then the pressure in the compartment is

If $x$ and $y$ are acute angles such that $\cos x + \cos y = \frac{3}{2}$ and $\sin x + \sin y = \frac{3}{4}$,then $\sin(x+y)$ is equal to

Half-life of a radioactive substance is $20 \, min$. The difference between the time when it is $33 \%$ disintegrated and $67 \%$ disintegrated is approximately ......... $min$.

The contribution in the total current flowing through a semiconductor due to electrons and holes are $3/4$ and $1/4$ respectively. If the drift velocity of electrons is $5/2$ times that of holes at this temperature,then the ratio of concentration of electrons and holes is

The $Pusa$ $Komal$ variety of cowpea,which was developed by hybridization and selection,is primarily resistant to which of the following?

Which of the following statements is not correct?