Sec 2 Science Heat Transfer topical questions

Name the SI unit of temperature, and the process by which heat travels along a metal bar.

State why a cooking pan has a metal base and a plastic handle.

State the three processes of heat transfer.

Which colour and texture radiate fastest: shiny white or dull black?

Give one everyday example of expansion.

Explain how a convection current forms in a beaker of water heated at the bottom.

Explain why the Sun can warm Earth even though space is almost empty.

Two cans of hot water are identical except that one is dull black and one is shiny silver. Which cools faster, and why?

A vacuum flask has a vacuum and shiny walls. Explain which process each feature reduces.

Explain why a woollen jumper keeps you warm on a cold day, using conduction.

A student says, “A metal spoon in hot soup becomes hot by convection.” Evaluate the statement.

A steel rod is heated. It becomes longer. Its mass stays 80 g and its volume rises from 10 cm³ to 10.2 cm³.

1. (a)Calculate the density before and after heating.[2]
2. (b)Explain the density change using particles.[2]

Explain why light-coloured clothes are a better choice than black clothes in strong sun, using absorption.

A room heater is on the floor. Explain how the air in the room becomes warm, and why the process would not work the same way in a solid block of the same size.

State one human activity and one natural process that are discussed as possible contributions to climate change. You do not need to decide which is larger.