Thermodynamics ...

An ideal gas at a pressure of $$1$$ atmosphere and temperature of $$27^{o}C$$ is compressed adiabatically until its pressure becomes $$8$$ times the initial pressure, then the final temperature is
($$\gamma =3/2$$)

An ideal gas at $$27^{o}C$$ is compressed adiabatically to $$ \dfrac{8}{27}$$ of its original volume. The rise in temperature is (Take $$\gamma =5/3$$)

A man of 60 kg gets 1000 cal of heat by eating 5 mangoes. His efficiency is 28%. To what height he can jump by using this energy 

Three samples of the same gas A, B and $$C\left ( \gamma =3/2 \right )$$ have initially equal volume. Now the volume of each sample is doubled. The process is adiabatic for A, isobaric for B and isothermal for C. If the final pressures are equal for all the three samples, the ratio of their initial pressures is:

A refrigerator placed in a room at 300 K has inside temperature at 264K. How many calories of heat shall be delivered to the room for each 1 kcal of energy consumed by the refrigerator ideally

For adiabatic expansion of a monoatomic perfect gas, the volume increases by 24%. The percentage of decrease in pressure is 

A gas is taken through the cycle A B C A, as shown. What is the net work done by the gas ?

Water of mass $$m_2$$ = 1 kg is contained in a copper calorimeter of mass $$m_1$$  = 1 kg. Their common temperature t = $$10^{0}C$$. Now a piece of ice of mass $$m_3$$  = 2 kg and temperature is $$-11^{0}C$$ dropped into the calorimeter. Neglecting any heat loss, the final temperature of system is. [specific heat of copper = 0.1 Kcal/ kg$$^{0}C$$, specific heat of water = 1 Kcal/kg$$^{0}C$$, specific heat of ice = 0.5 Kcal/kg$$^{0}C$$, latent heat of fusion of ice = 78.7 Kcal/kg]

If an ideal gas, at constant temperature and pressure, expands, then its 

Which statement is true about 2nd law of Thermodynamics?