JEE Advanced Physics 2021 Shift 1 #2 Thermodynamic Cyclic Process

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An ideal gas undergoes a four step cycle as shown in the P-V diagram below. During this cycle heat is absorbed by the as in:
A) steps 1 and 2
B) steps 1 and 3
C) steps 1 and 4
D) steps 2 and 4

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[vincentzhang]

or, by ideal gas law: PV=nRT, if T is suppose to increase, therefore, either P should increase or V should increase and you would have gotten the answer C in 10 seconds.

[woody]

By reverse logic: When the gas absorbs external heat, we had to add heat. By adding heat to a fixed amount of gas, we either increase its volume or pressure or both. Correct answers are those, which include these changes (increase in temperature/increase in pressure)
-> cycle 1 + 4 (answer C)

[abhijeetsatpathy]

We can eliminate BD beforehand since both process are absolutely opposite of each other hence both cannot absorb the gas and they the rest options are easy using isochor where W is 0.

[VictorAlfarochannel]

Sir, I have seen that you did around one video covering digital logic with gates and such. I would highly request, don't know if a request matters from one person, but a series on digital logic. I feel as though you would explain that topic way better than the sources out there. Thank you again for all of your hard work.

[vavavoom]

I think it was a bit easy question but thanks for explination

[waqassaeed]

Sir can we say that going from left to right along iso-therm lines the temperature increase and decreases when we go against it(right to left) ?

[pranjalverma]

You arrived so early with jee advance 2021 ..