IGCSE Physics (0625) 2.3 Thermal processes – 2.3.2 Convection Paper 1

IGSCE Physics Paper 1 - All Chapters

Question

In which substances is convection a method of thermal energy transfer?

    1. air and water only

    2. air only

    3. air, water and wood

    4. water only

Answer/Explanation
Answer/Explanation

Ans: A

Question

A beaker of water is heated and thermal energy travels through the water by convection.

What happens to the density of the water when it is heated and how does the water move?

    1. The density decreases and the heated water moves downwards.

    2. The density decreases and the heated water moves upwards.

    3.  The density increases and the heated water moves downwards.

    4.  The density increases and the heated water moves upwards.

Answer/Explanation

Ans: B

Question

The metal surface of a kettle is hot.

What happens to the cool air outside the kettle when it comes into contact with the hot kettle?

  1. The density of the air decreases and the air falls.
  2. The density of the air decreases and the air rises.
  3. The density of the air increases and the air falls.
  4. The density of the air increases and the air rises.
Answer/Explanation

Ans: B

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