Same chapter3 marksDifficulty: Medium
Distinguish between isothermal and adiabatic processes.
Heat and Thermodynamics
3 marksDifficulty: Medium
State the second law of thermodynamics in the Kelvin-Planck and the Clausius forms.
Original Khojo Papers practice question — not from a past board paper.
Answer
The Kelvin-Planck statement says that no process is possible whose sole result is the complete conversion of heat from a reservoir into work. The Clausius statement says that no process is possible whose sole result is the transfer of heat from a colder to a hotter body.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The two statements are equivalent, and both rule out a perfectly efficient heat engine.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Distinguish between conduction, convection and radiation.
Heat and Thermodynamics
Same chapter3 marksDifficulty: Medium
State the first law of thermodynamics and explain its terms.
Heat and Thermodynamics
Same chapter3 marksDifficulty: Medium
A Carnot engine works between 500 K and 300 K. Find its efficiency.
Heat and Thermodynamics
Same chapter3 marksDifficulty: Medium
Calculate the work done when one mole of an ideal gas expands isothermally and reversibly from 10 L to 20 L at 300 K. Take R = 8.31 J mol−1 K−1.
Heat and Thermodynamics
Same chapter3 marksDifficulty: Medium
Why can the efficiency of a heat engine never be 100%?
Heat and Thermodynamics