Question

Which of the following statements does not represent second law of thermodynamics

• A. It is impossible to obtain work by cooling a body below the coldest to its surroundings.
• B. It is impossible for a self acting machine to transfer heat from a body at a lower temperature to a body at a higher temperature without taking energy from an outside source.
• C. It is impossible to construct a perpetual motion machine, which takes heat from a system and converts into work in a cycle without producing any change in the system.
• D. Only such changes in nature take place in which entropy decrease.

Answer 1

Answer: (D)

ऊष्मागतिकि का द्वितीय नियम दो प्रकार के हैं एक ऊष्मीय इंजन के लिये तथा दूसरा ऊष्मीय पम्प के लिये जबकि चक्रीय प्रक्रम के लिए इन्ट्रापी घटती नहीं है।