Thermodynamics Question 124
Question: If $ \Delta Q $ and $ \Delta W $ represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as
[Roorkee 2000]
Options:
A) $ \Delta Q=\Delta U+\Delta W $
B) $ \Delta Q=\Delta U-\Delta W $
C) $ \Delta Q=\Delta W-\Delta U $
D) $ \Delta Q=-\Delta W-\Delta U $ where $ \Delta U $ is the internal energy
Show Answer
Answer:
Correct Answer: B
Solution:
From FLOT$ \Delta Q=\Delta U+\Delta W $
Q Heat supplied to the system so DQ Positive and work is done on the system so DW ® Negative Hence +DQ = DU - DW
