Heat Thermodynamics Test

Result

Heat Thermodynamics Test - 4

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Question 1
1 / -0

A gas is taken through a number of thermodynamic states. What happens to its specific heat?

A
It is always constant.

B
It increases.

C
It decreases.

D
It can have any value depending upon the process of heat absorbed or evolved.

Solution

The specific heat of a gas depends upon the process and can have any value as specific heat at constant volume is (C_v) and at constant pressure is (C_p).
Question 2
1 / -0

During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100 J. The work done by the gas in this process is

A
zero

B
-100 J

C
200 J

D
100 J

Solution

dU = -100 J
dQ = dU + dW
dQ = 0 (Adiabatic process)
dW = -dU = +100 J
Question 3
1 / -0

When you make ice cubes, the entropy of water

A
does not change

B
increases

C
decreases

D
may either increase or decrease, depending on the process used

Solution

The entropy function gives us a numerical measure of the irreversibility of a given process i.e., it is a measure of disorder of a system.
During formation of ice cubes, orderedness increases i.e., disorderness decreases, hence entropy decreases.