Is the melting of ice an adiabatic or an isothermal process?

$A$ perfect gas of volume $5 \ L$ is compressed isothermally to a volume of $1 \ L$. The $r.m.s.$ speed of the molecules will

The condition $dQ = dW$ holds good in which of the following?

In an isothermal expansion,what happens to the internal energy of the gas?

The work done by an ideal gas of $2 \text{ moles}$ in increasing its volume from $V$ to $2V$ at constant temperature $T$ is $W$. The work done by an ideal gas of $4 \text{ moles}$ in increasing its volume from $V$ to $8V$ at constant temperature $\frac{T}{2}$ is:

During the isothermal expansion,a confined ideal gas does $(-150) \ J$ of work against its surroundings. This means that