c (c) In isothermal expansion temperature remains constant, hence no change in internal energy.
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$1\,g$ of a liquid is converted to vapour at $3 \times 10^5\,Pa$ pressure. If $10 \%$ of the heat supplied is used for increasing the volume by $1600\,cm ^3$ during this phase change, then the increase in internal energy in the process will be $............\,J$
A Carnot engine whose heat $\operatorname{sinks}$ at $27\,^{\circ} C$, has an efficiency of $25 \%$. By how many degrees should the temperature of the source be changed to increase the efficiency by $100 \%$ of the original efficiency $?$
Find the change in the entropy in the following process $100 \,gm$ of ice at $0°C$ melts when dropped in a bucket of water at $50°C$ (Assume temperature of water does not change) ..... $ cal/K$
In $1^{\text {st }}$ case, Carnot engine operates between temperatures $300\,K$ and $100\,K$. In $2^{\text {nd }}$ case, as shown in the figure, a combination of two engines is used. The efficiency of this combination (in $2^{\text {ad }}$ case) will be.
An ideal gas follows a process described by the equation $PV ^2= C$ from the initial $\left( P _1, V _1, T _1\right)$ to final $\left(P_2, V_2, T_2\right)$ thermodynamics states, where $C$ is a constant. Then