Embibe Experts Solutions for Chapter: Thermodynamics, Exercise 1: Exercise - 1

Show that the internal energy of the air (treated as an ideal gas) contained in a room, remains constant as the temperature changes between day and night. Assume that the atmospheric pressure around remains constant and the air in the room maintains this pressure by communicating with the surrounding through the windows, doors, etc.

When an ideal gas is compressed isothermally, then its pressure increases because

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $\frac{C_{\mathrm{p}}}{C_{\mathrm{V}}}$ for the gas is

In a certain gas, the ratio of the speed of sound and root-mean-square speed is $\sqrt{\frac{5}{9}}$. The molar heat capacity of the gas in a process given by, $PT=\text{constant}$ is (take, $R=2 \mathrm{cal} {\mathrm{mole}}^{-1} {\mathrm{K}}^{-1}$.Treat the gas as ideal),

A polytropic process for an ideal gas is represented by equation $P{V}^{\mathrm{n}}=\text{constant}$. If $\mathrm{\gamma }$ is the ratio of specific heats $\left(\frac{C_{\mathrm{p}}}{C_{\mathrm{v}}}\right)$, then value of $n$ for which molar heat capacity of the process is negative is given as,

If the door of a refrigerator is kept open, then which of the following is true?

A scientist says that the efficiency of his heat engine which operates at source temperature $127 °\mathrm{C}$ and sink temperature $27 °\mathrm{C}$ is $26\%,$ then

Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of