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JEE Main 5 September 2020, Shift 1, Physics Q8

Question 8 of 75 in this shift, Physics question 8 of 25.

Three different processes that can occur in an ideal monoatomic gas are shown in the P vs V diagram. The paths are labelled as

A\rightarrow B

A\rightarrow C

and

A\rightarrow D

. The change in internal energies during these process are taken as

E_{AB}

E_{AC}

and

E_{AD}

and the workdone as

W_{AB}

W_{AC}

and

W_{AD}

. The correct relation between these parameters are :

The figure, in words

P vs V graph with axes P (vertical) and V (horizontal, arrow). Two decreasing curves labelled T_1 (lower-right label) and T_2, with 'T_1>T_2' printed. Points A, B, C, D marked: from A a horizontal arrow to B, a vertical arrow up to C, and an arrow up along a curve to D. Further unlabelled dots lie on the curves at upper left.

(1) $E_{AB}=E_{AC}=E_{AD}$ , $W_{AB}>0$ , $W_{AC}=0$ , $W_{AD}>0$ Official answer
(2) $E_{AB}=E_{AC}<E_{AD}$ , $W_{AB}>0$ , $W_{AC}=0$ , $W_{AD}<0$
(3) $E_{AB}<E_{AC}<E_{AD}$ , $W_{AB}>0$ , $W_{AC}>W_{AD}$
(4) $E_{AB}>E_{AC}>E_{AD}$ , $W_{AB}<W_{AC}<W_{AD}$

Official answer

Option 1

NTA final key (Sep 2020).

Chapter: Thermodynamics
Topic: Thermodynamic Processes
Idea tested: State vs. Path Functions

Same topic in other shifts

All Thermodynamic Processes questions

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.