SATHEE: Thermodynamics Question 251

Thermodynamics Question 251

Question: A closed system undergoes a process $1 \to 2$ for which the values $W_{1 - 2}$ and $Q_{1 - 2}$ are 50 kJ and - 20 kJ respectively. If the system is returned to state 1 and $Q_{1 \to 2} + 10 k J$ the work done $W_{1 \to 2}$ is

Options:

A) 40 kJ

B) 50 kJ

C) -60 kJ

D) -50 kJ

Show Answer

Answer:

Correct Answer: C

Solution:

[c] $- 20 = Δ U + 50 \Rightarrow Δ U = - 70.$

$From 2 \to 1, Δ U = 70 k J .$

$Now 10 = 70 + W \Rightarrow W = - 60 k J .$

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Thermodynamics Question 251

Question: A closed system undergoes a process 1→2 for which the values W1−2 and Q1−2 are 50 kJ and - 20 kJ respectively. If the system is returned to state 1 and Q1→2+10kJ the work done W1→2 is

Options:

Answer:

Solution:

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Question: A closed system undergoes a process $1 \to 2$ for which the values $W_{1 - 2}$ and $Q_{1 - 2}$ are 50 kJ and - 20 kJ respectively. If the system is returned to state 1 and $Q_{1 \to 2} + 10 k J$ the work done $W_{1 \to 2}$ is