IGCSE Thermal Physics Flashcard

Front

What causes a liquid to become cooler when a student blows gently across it?

Back

The more energetic particles in the liquid escape into the air.

Front

Very small pollen grains are suspended in water. A bright light shines from the side. When looked at through a microscope, small specks of light are seen to be moving in a random, jerky manner. What are the moving specks of light?

Back

pollen grains being hit by water molecules

Front

A gas is contained in a sealed container in a laboratory. The temperature of the gas increases. What happens to the average speed and what happens to the total kinetic energy of the gas molecules?

Back

average speed increases, total kinetic energy increases

Front

The same mass of a gas is trapped in four identical cylinders by a piston that can move. The diagrams show the samples of gas in different conditions of volume and temperature. Which list gives the pressure of the gas in order from lowest to highest?

Back

1 → 3 → 2 → 4

Front

What causes the liquid level in a thermometer to rise when placed in hot water?

Back

The liquid expands.

Front

The diagram shows a liquid-in-glass thermometer. Which change to the design would result in a more sensitive thermometer?

Back

Increase the volume of the bulb.

Front

Which statement about the measured energy is correct when raising the temperature of an aluminium block from 50 °C to 60 °C?

Back

The measured energy will be greater than the calculated energy because some energy is transferred to the surroundings.

Front

Which statements correctly describes a liquid that is boiling?

Back

Bubbles seen, takes place throughout the liquid.

Front

Which statement about boiling and evaporation is correct?

Back

Evaporation takes place at the surface of a liquid but boiling takes place throughout the liquid.

Front

Why are small gaps left between the metal rails of a railway track?

Back

to allow for expansion of the rails on a hot day