An ideal gas undergoes four different processes from the same initial state (figure). Four processes are adiabatic, isothermal, isobaric and isochoric. Out of 1, 2, 3 and 4 which one is adiabatic?

If an average person jogs, he produces $14.5 \times 10^3 \mathrm{cal} / \mathrm{min}$. This is removed by the evaporation of sweat. The amount of sweat evaporated per minute (assuming 1 kg requires $580 \times 10^3$ cal for evaporation) is

Consider p-V diagram for an ideal gas shown in figure.

Out of the following diagrams, which figure represents the T-p diagram?

(i)

(ii)

(iii)

(iv)

An ideal gas undergoes cyclic process ABCDA as shown in given p-V diagram. The amount of work done by the gas is

Consider two containers $A$ and $B$ containing identical gases at the same pressure, volume and temperature. The gas in container $A$ is compressed to half of its original volume isothermally while the gas in container $B$ is compressed to half of its original value adiabatically. The ratio of final pressure of gas in $B$ to that of gas in $A$ is