### Class XI

Kelvin-Planck statement of Second Law of Thermodynamics states that
1. No process is possible whose sole result is the absorption of heat from a reservoir and the complete conversion of the heat into work.
2. Processes are possible whose sole result is the absorption of heat from a reservoir and the complete conversion of the heat into work.
3. Processes are not possible whose sole result is the absorption of heat from a reservoir and the partial conversion of the heat into work.
4. No process is possible whose sole result is the absorption of heat from a reservoir and the partial conversion of the heat into work.
In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium state B, an amount of work equal to 22.3 J is done on the system. If the gas is taken from state A to B via a process in which the net heat absorbed by the system is 9.35 cal, how much is the net work done by the system in the latter case?
1. 17.6 J
2. 16.8 J
3. 17.9 J
4. 17.2 J
An ideal gas is taken through a Carnot cycle. The isothermal expansion occurs at 250∘∘C, and the isothermal compression takes place at 50.0∘∘C. Assuming that the gas absorbs 1 200 J of energy from the hot reservoir during the isothermal expansion, find the energy expelled to the cold reservoir in each cycle
1. 752 J
2. 741 J
3. 721 J
4. 711 J
An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m3m3 to 3.00 m3m3 and if 12.5 kJ of energy is transferred to the gas by heat, what is the change in its final temperature?
1. 900 K
2. 800 K
3. 950 K
4. 850 K
A power plant operates at 32.0 percent efficiency during the summer when the sea water for cooling is at 20.0∘∘C. The plant uses 350∘∘C steam to drive turbines. Assuming that the plant’s efficiency changes in the same proportion as the ideal efficiency, what would be the plant’s efficiency in the winter, when the sea water is at 10.0∘∘C?
1. 31percent
2. 34percent
3. 33percent
4. 32percent
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