Question

The second law of thermodynamics implies :

• A. whole of heat can be converted into mechanical energy
• B. no heat engine can be 100% efficient
• C. every heat engine has an efficiency of 100%
• D. a refrigerator can reduce the temperature to absolute zero

Answer 1

The correct option is B no heat engine can be 100% efficient

second law of thermodynamics states that ,

"It is impossible to construct a device which produces no other effect than transfer of heat from lower temperature body to higher temperature body."

$\therefore$ The second law of thermodynamics implies that no heat engine can be 100% efficient.