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NEET 2010
Exam
NEET
Year
2010
Subject
Physics
Chapter
Thermodynamics

NEET 2010 · Physics · Thermodynamics

If Δ U and Δ W represent the increase in internal energy and work...

If ΔU\Delta \mathrm{U} and ΔW\Delta \mathrm{W} represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

Options

  1. AΔU=−ΔW\Delta \mathrm{U}=-\Delta \mathrm{W}, in a adiabatic process
  2. BΔU=ΔW\Delta \mathrm{U}=\Delta \mathrm{W}, in a isothermal process
  3. CΔU=ΔW\Delta \mathrm{U}=\Delta \mathrm{W}, in a adiabatic process
  4. DΔU=−ΔW\Delta \mathrm{U}=-\Delta \mathrm{W}, in a isothermal process

Correct answer

A. ΔU=−ΔW\Delta \mathrm{U}=-\Delta \mathrm{W}, in a adiabatic process

Step-by-step solution

From first law of thermodynamics Δ\DeltaQ=Δ\DeltaU+ΔW\Delta \mathrm{W}For adiabatic process ΔQ=0\Delta Q=0 \Rightarrow \quad Δ\DeltaU=-Δ\DeltaW
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