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Physics Thermodynamics Isothermal Process Single Correct MCQ
Published on: September 12, 2026

When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be $1.5 \times 10^{4}$ joules . During this process about

A
$3.6 \times 10^{3}$ cal of heat flowed out from the gas
B
$3.6 \times 10^{3}$ cal of heat flowed into the gas
C
$1.5 \times 10^{4}$ cal of heat flowed into the gas
D
$1.5 \times 10^{4}$ cal of heat flowed out from the gas

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Text Solution

Verified by Experts
The correct answer is:
A

In isothermal compression, there is always an increase of heat. which must flow out the gas.

$\Delta Q = \Delta U + \Delta W \Rightarrow \Delta Q = \Delta W \quad ( \because \Delta U \equiv 0 )$

$\Rightarrow \Delta Q = -1.5 \times 10^{4}J = \frac{1.5 \times 10^{4}}{4.18} \text{ cal} = -3.6 \times 10^{3} \text{ cal}$

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