JEE Main 2017 · 9 Apr · Shift 1 · Physics Q10

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PhysicsSingle correct+4 / -1Question 10 of 90

For the P-V diagram given for an ideal gas,

out of the following which one correctly represents the T-P diagram ?

P-V diagram: a hyperbola P = constant/V from point 1 (high P, small V) down to point 2 (low P, large V).

T rising linearly with P from 1 to 2

T against P: a straight line rising from point 1 to point 2.

A vertical line: P constant, T rising from 1 to 2

T against P: a vertical segment, point 1 below point 2 at the same P.

A horizontal line: T constant, P falling from 1 to 2

T against P: a horizontal segment with point 2 at lower P (left) and point 1 at higher P (right).

A horizontal line: T constant, P rising from 1 to 2

T against P: a horizontal segment with point 1 at lower P (left) and point 2 at higher P (right).

Answer and worked solution

Official answer: C

$P\propto\frac1V$ is an isotherm, so T stays constant while P falls from 1 to 2. On a T-P plot that is a horizontal line with 2 at lower P than 1: graph (3).

Topics:Thermodynamic processes Ideal gas equation

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JEE Main 2017 · 9 Apr · Shift 1, Physics question 10