If the temperature of a gas is increased from $27^{\circ} \mathrm{C}$ to $159^{\circ} \mathrm{C}$, then the percentage increase in the rms speed of the gas molecules is

The Fahrenheit and Kelvin scales of temperature will have the same reading at a temperature of

If the ratio of densities of two substances is $5: 6$ and the ratio of their specific heat capacities is $3: 5$, then the ratio of heat energies required per unit volume so that the two substances can have same temperature rise is

In a process, the work done by the system is equal to the decrease in its internal energy. The process that the system undergoes is