List of top Physics Questions on Thermodynamics asked in AP EAMCET

An ideal gas is taken around ABCA as shown in the P-V diagram. The work done during a cycle is:
An ideal gas is taken
A gas is initially at a state of \( (P_0, V_0, T_0) \). If \( W_1 \) is work done in isobaric expansion to volume \( V \) and \( W_2 \) is the work done in isothermal expansion to volume \( V \), then:
Two soap bubbles of radii \(R_1\) and \(R_2\) are kept in vacuum at constant temperature, the ratio of masses of air inside them are:
The efficiency of a Carnot heat engine is 25% and the temperature of its source is 127°C. Without changing the temperature of the source, if the absolute temperature of the sink is decreased by 10%, the efficiency of the engine is:

A Carnot heat engine has an efficiency of 10%. If the same engine is worked backward to obtain a refrigerator, then the coefficient of performance of the refrigerator is

A gas with a ratio of specific heats, \( \gamma = \frac{4}{3} \), is heated isobarically. The percentage of the given heat used in external work done is

Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Assuming the gas to be an ideal gas. Efficiency of this cycle is nearly:


 

A gas absorbs 18 J of heat and work done on the gas is 12 J. Then the change in internal energy of the gas is:
A Carnot engine operates between a source and a sink. The efficiency of the engine is \(40\%\) and the temperature of the sink is \(27^\circ\text{C}\). If the efficiency is to be increased to \(50\%\), then the temperature of the source must be increased by
A car engine has a power of \(20 \, kW\). The car makes a roundtrip of \(1\) hour. If the thermal efficiency of the engine is \(40\%\) and the ambient temperature is \(300 \, K\), the energy generated by fuel combustion is