Thermodynamics ...

A gas for which $$\gamma =1.5$$ is suddenly compressed to $$\dfrac{1}{4}$$ th of its initial value then the ratio of the final to initial pressure is

During an adiabatic process, the pressure of a gas is proportional to the cube of its adiabatic temperature. The value of  $$\dfrac {C_{p}}{C_{v}}$$ for that gas is :

P-V plots for two gases adibatic processes are shown in the figure. Plots 1 and 2 should correspond respectively

During an adiabatic change the density becomes $$\cfrac{1}{16}th$$ of the initial value, then $$\cfrac{P_{1}}{P_{2}}$$ is : $$\left ( \gamma =1.5 \right )$$

The pressure and density of a diatomic
gas  $$\left ( \gamma =\dfrac{7}{5} \right )$$ changes adiabatically from (p,d)
to$$\left ( p^{1} ,d^{1}\right )$$. If $$\dfrac{d^{'}}{d}=32$$ then $$\dfrac{p^{'}}{p}$$ is

Three sample of the same gas, x, y and z, for which the ratio of specific heats is $$\gamma =3/2$$ have initially the same volume. The volume of the each sample is doubled by adiabatic process in the case of x, by isobaric process in the case of y and by isothermal process in the case of z. If the initial pressure of the sample of x, y and z are in the ratio $$2\sqrt{2}:1:2$$ then the ratio of their final pressures is 

A heat engine operates between 2100 K and 700K. Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this ?

Adiabatic modulus of elasticity of a gas is $$2.1 \times 10^{5}Nm^{-2}$$. It's isothermal modulus of elasticity is      ($$ \gamma =1.4$$)

At $$27^{o}C$$ a gas compressed suddenly such that its pressure becomes $$\dfrac{1}{32}$$ of original pressure. Final temperature in Kelvin will be $$\left ( \gamma =5/3 \right )$$

During an adiabatic process, if the pressure of the ideal gas is proportional to the cube of its temperature, the ratio $$\gamma =\dfrac{C_{p}}{C_{v}}$$ is
($$C_{p}=$$ Specific heat at constant pressure ; $$C_{v}=$$Specific heat at constant volume)