SATHEE: Thermodynamics Question 215

Thermodynamics Question 215

Question: When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be $1.5 \times 10^{4} j o u l e s$ . During this process about

[MP PMT 1987]

Options:

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

Show Answer

Answer:

Correct Answer: A

Solution:

In isothermal compression, there is always an increase of heat.

Which must flow out the gas.

$Δ Q = Δ U + Δ W \Rightarrow Δ Q = Δ W (∵ Δ U = 0)$

Therefore $Δ Q = - 1.5 \times 10^{4} J = \frac{1.5 \times 10^{4}}{4.18} c a l = - 3.6 \times 10^{3} c a l$

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Thermodynamics Question 215

Question: When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be 1.5×104 joules . During this process about

Options:

Answer:

Solution:

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Question: When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be $1.5 \times 10^{4} j o u l e s$ . During this process about