List of top Physics Questions on Thermodynamics asked in KEAM

When two different liquids of same mass but at two different temperatures $27^\circ C$ and $47^\circ C$ are mixed together, the resulting temperature of the mixture is $35^\circ C$. The ratio of their specific heat capacities is

A monoatomic ideal gas of $ n $ moles heated from temperature $ T_1 $ to $ T_2 $ under two different conditions (i) at constant pressure, (ii) at constant volume. The change in internal energy of the gas is:

If $ m_a $ and $ m_i $ are the slopes of the adiabatic and isothermal curves for an ideal gas, then \[ \left( \frac{c_p}{c_v} = \gamma \right) \]

The work done by a gas on the system is zero in

A system of ideal gas undergoes a thermodynamic process in which the initial pressure and volume are equal to the final pressure and volume. Let △Q is the heat supplied to the system,△W is the work done by the system and △U is the change in internal energy. The correct option is:

An ideal diatomic gas is made up of molecules that do not vibrate. Its volume compressed by a factor of 32,without any exchange of heat. If the initial and final pressures are P₁ and P₂,respectively,the ratio P₁:P₂,is:

A heat engine operates between a cold reservoir and a hot reservoir. The engine takes 200 J of heat from the hot reservoir and has the efficiency of 0.4. The amount of heat delivered to the cold reservoir in a cycle is:

When an ideal diatomic gas is heated at constant pressue, fraction of heat enerry supplied that increases the internal energy of the gas is

A process in which there is no flow of heat between the system and surroundings is a/an

Two thermally insulated identical vessels A and B are connected through a stopcock. A contains a gas at STP and B is completely evacuated. If the stopcock is suddenly opened then

Which of the accompanying P-V diagrams best represent; an isothermal process?

$ 800\,cc $ volume of a gas having $ \gamma =\frac{5}{3} $ is suddenly compressed adiabatically to $ 100\,cc $ . If the initial pressure is P, then the final pressure will

A Carnot engine is operating between a hot body and cold body maintained at temperature $T_1$ and $T_2$ respectively. Consider the following three cases : The temperature of the hot body is changed to $T_1 + \Delta T$ and cold body is at $T_2$ : The temperature of the hot body is at $T_1$ and cold body is changed to $T_2 + \Delta T$ : The temperature of the hot body is at $T_1$ and cold body is changed to $T_2 - \Delta T$

If the amount of heat given to a system is $35\, J$ and the amount of work done on the system is $15\, J$, then the change in internal energy of the system is