1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The ratio of specific heat capacities at constant pressure to that at constant volume for a given mass of a gas is $\frac{5}{2}$. If the percentage increase in volume of the gas while undergoing an adiabatic change is $\frac{3}{2}$, then the percentage decrease in pressure will be:
A
$\frac{15}{4}$
B
$\frac{3}{5}$
C
$\frac{4}{15}$
D
$\frac{5}{3}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure below. It absorbs 60 J of heat during the part AB and rejects 80 J of heat during CA . There is no heat exchanged during the process $\mathrm{BC} . \mathrm{A}$ work of 40 J is done on the gas during the part BC . If the internal energy of the gas at A is 1450 J , then the work done by the gas during the part CA is:

COMEDK 2025 Morning Shift Physics - Heat and Thermodynamics Question 9 English

A
10J
B
20J
C
40J
D
30J
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The coefficient of volume expansion of glycerine is $$49 \times 10^{-5} \mathrm{~K}^{-1}$$. The percentage change in its density for a $$50^{\circ} \mathrm{C}$$ rise in temperature is

A
3.54
B
5.24
C
4.25
D
2.45
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The latent heat of vaporisation of water is $$2240 \mathrm{~J}$$. If the work done in the process of vaporisation of $$1 \mathrm{~g}$$ is $$168 \mathrm{~J}$$, the increase in internal energy is

A
1408 J
B
2072 J
C
2208 J
D
2408 J
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