Question
An ideal gas undergoes a four step cycle as shown in the P - V diagram below. During this cycle, heat is absorbed by the gas in:
JEE Advanced
Physics
Thermodynamics
2021
JEE Advanced 2021 (Paper 1)
JEE Advanced Physics Question (2021) — Solution
Options
- A. steps 1 and 2
- B. steps 1 and 3
- C. steps 1 and 4
- D. steps 2 and 4
Answer
C. steps 1 and 4
Step-by-step solution
∵     P V = n R T       . . . 1 In Step 1 : P = constant V = increasing So, T also will be increase (From equation 1 ) Now, ∵     Q = n C p ∆ T ∵ T   ↑ ∴     ∆ T = Positive So, Q = + v e = absorbed Now In step 4 , P = ↑ V = constant So from equation 1 , T will also be increasing. Now, ∵     Q = n C v ∆ T ∵   T ↑ ∴     ∆ T = Positive So, Q = + v e = absorbed correct option is 3 .
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