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WorksheetsFirst Law of Thermodynamics
Total questions: 6
Worksheet time: 6mins
Which of the following is equivalent to the principle of energy conservation?
Newton’s first law
The first law of thermodynamics
Newton’s second law
The second law of thermodynamics
An ideal gas undergoes the thermodynamic changes represented in the P –V diagram below
(P → Q → R → P).
Which of the following is the net work done by the gas in a cycle?
4.5 × 105 J
3.0 × 105 J
1.0 × 105 J
Zero
The diagram shows the pressure-volume relationship for a fixed mass of an ideal gas that undergoes a cycle XYZ.
In which part(s) of the cycle is external work done on the gas?
Y → Z only
Y → Z and Z → X only
X → Y and Z → X only
X → Y only
The diagram shows the pressure–volume (PV) relationship for a gas.
Which of the following area(s) is/are equal to the work done by the gas as it expands?
area I
area II
area I + area II
area I – area II
The diagram shows the pressure/volume (p/V) diagram for one cycle PQRS of an engine.
In which sections of the cycle is work done on the engine?
SP only
PQ only
SP and PQ only
RS and SP only
The first law of thermodynamics states that ΔU the change in internal energy of a system is related to the heat Q supplied to it and W the work on it by the equation:
ΔU = Q + W
What are ΔU, Q and W for a constant mass of ideal gas whose temperature is decreased at constant pressure?
A
B
C
D
