At the same temperature and pressure,which of the following gases will have the highest kinetic energy per mole?

$A$ vessel contains $1$ mole of $O_2$ gas (molar mass $32$) at a temperature $T$. The pressure of the gas is $P$. An identical vessel containing $1$ mole of $He$ gas (molar mass $4$) at a temperature $2T$ has a pressure of:

Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at $40 \ cm$ from left end. A $30 \Omega$ resistance is connected in series with the smaller of the two resistances, the null point shifts by $20 \ cm$ to the right end. The value of smaller resistance in $\Omega$ is

The maximum possible number of real roots of the equation $x^5 - 6x^2 - 4x + 5 = 0$ is

What is the cytoskeleton composed of?

If $f(x) = (x^2 - 1)^7$,then $f^{(14)}(x)$ is equal to