List of top Physics Questions on Thermodynamics asked in AP EAPCET

Assertion (A): When \(1\,g\) of ice melts at constant temperature at a pressure of \(1\,atm\), the increase in internal energy is greater than \(80\,cal\).
Reason (R): During melting of ice, work is done on the ice.
Two gases \(A\) and \(B\) are initially at same pressure, volume and temperature. If \(A\) is compressed isothermally and \(B\) adiabatically to half of the initial volume, then the final pressure of \(A\)

An ideal gas is taken through a cyclic process ABCA shown in a P–V diagram. The net work done by the gas during the complete cycle is:

Based on the cyclic process shown in the graph, which point represents the coolest and hottest state of the gas? 

In a thermodynamic process, a gas releases 20 J of heat and 10 J of work is done on the gas. If initial internal energy was 40 J, the final internal energy is:
The efficiency of a Carnot engine working between temperatures \(T_1\) and \(T_2\) (where \(T_1 > T_2\)) is given by:
The pressure and density of a diatomic gas (\( \gamma = 7/5 \)) change adiabatically from \( (p, d) \) to \( (p', d') \). If \( \frac{d'}{d} = 32 \), then \( \frac{p'}{p} \) should be:
Internal energy of an ideal gas depends only on:
An ideal gas is taken through the cycle \( A\rightarrow B\rightarrow C\rightarrow A \) as shown in figure. If the net heat supplied to the gas in the cycle is 10 J, the work done in the process \( C\rightarrow A \) is:
A Carnot engine having an efficiency of 20 % is used as a refrigerator. If the amount of heat absorbed from the reservoir at low temperature is 200 J, then the work done on the refrigerator is:
During an adiabatic process, if the volume of 4 moles of a monoatomic gas initially at a temperature of $127^{\circ}C$ increases by 7 times, then the work done by the gas is:
A Carnot engine of 50 % efficiency takes heat from a source of 400 K. To change efficiency to 70 % without changing the sink temperature, the new temperature of source should be (nearer to)
In which of the following thermodynamic process, the internal energy of system remains constant
In an isothermal process, which of the following remains constant?
The efficiency of a Carnot engine working between temperatures $127^\circ\text{C}$ and $27^\circ\text{C}$ is
A Carnot engine operates between a heat source at $T_1 = 600\text{ K}$ and a sink at $T_2 = 300\text{ K}$. If the engine absorbs $1000\text{ J}$ of heat from the source per cycle, the work done per cycle is:
For a gas, \( C_p - C_v = R \). If \( C_v = 2R \), then \( C_p \) is:
A Carnot engine operates between 600 K and 300 K. Efficiency is:
A gas expands from volume 2 m\(^3\) to 6 m\(^3\) at constant pressure 100 Pa. Work done is:
A gas absorbs 500 J heat and does 200 J work. Change in internal energy is:
A body cools from 80°C to 60°C in 5 minutes. Surrounding temperature is 20°C. Time to cool from 60°C to 40°C is:
Heat flows through a rod of length 1 m and area 1 m$^2$. Temperature difference = 10 K. If thermal conductivity = 5 W/mK, heat flow per second is:
Heat required to raise temperature of 2 kg substance by 5°C is 1000 J. Specific heat is:
A 100 g metal at 80°C is placed in 100 g water at 20°C. Final temperature is 40°C. Find specific heat of metal.
The coefficient of volume expansion of a material is \(5\times10^{-4}\left(^{\circ}\mathrm{C}\right)^{-1}\). The fractional change in its density for a \(40^\circ\mathrm{C}\) rise in temperature is nearly: