Ramsay Test Thermodynamics 4

Question 1

What does a Carnot cycle represent in thermodynamics?

Accepted Answer

The most efficient possible heat engine

Answer

The Carnot cycle defines the maximum theoretical efficiency between two temperatures.

Question 2

As the temperature of a gas increases at constant volume, what happens to its pressure?

Accepted Answer

It increases

Answer

By Gay-Lussac's law, pressure rises proportionally with temperature at fixed volume.

Question 3

What is the term for heat that changes a substance's temperature without changing its phase?

Accepted Answer

Sensible heat

Answer

Sensible heat produces a measurable temperature change you can sense.

Question 4

A heat engine's thermal efficiency is the ratio of work output to what?

Accepted Answer

Heat input

Answer

Thermal efficiency equals net work output divided by the heat energy supplied.

Question 5

What process describes a substance changing directly from solid to gas?

Accepted Answer

Sublimation

Answer

Sublimation is the direct transition from solid to vapor without becoming liquid.

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