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QUESTION 1 / 20 · TEMPERATURE & HEATEasy

What is 0 °C in kelvin?

GAS PISTON LAB · PV = nRT

Squeeze, heat or expand a gas

Pressure, volume and temperature are locked together by the ideal gas law. Hold one constant and change another, then watch the third respond, on the piston and on the pressure–volume diagram engineers use to design engines.

50 kPapressure

5.0 Lvolume

300 Ktemperature · fixed

Volume5.0 L

Boyle's law: P × V stays constantSqueeze the gas and the same particles hit a smaller area more often, so pressure rises. The temperature is held fixed, so the gas releases heat as you compress it.Work done by the gas: +0 J

0.1 mol of an ideal gas. Dashed lines are isotherms at 200, 400 and 600 K. The shaded area under the path is the work done by (or on) the gas since the white starting point.

What this thermodynamics test covers, in short

Twenty multiple-choice questions at first-year university level, four on each of five topics: temperature and heat, the laws of thermodynamics, gases, heat transfer, and engines and entropy.

Temperatures in gas-law questions must be in kelvin (K = °C + 273). The test is our own and not normed.

By What's Your IQ · Reviewed 5 Oct 2026

Format: 20 multiple-choice questions
Level: First-year university
Bonus: Ideal-gas piston with live PV diagram
Key idea: Entropy of an isolated system never decreases

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What is 0 °C in kelvin?

Squeeze, heat or expand a gas

What this thermodynamics test covers, in short

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