Convection

An electrical heater is put into a beaker containing cold oil, as illustrated. The heater is then switched on. What change occurs to the liquid at X?

May/June 2015

The diagram illustrates the interior of a refrigerator. When the refrigerator is turned on for the first time, what occurs to the air close to the cooling unit?

May/June 2016

When a piece of smouldering rope is placed at the opening of the box shown in the diagram, the smoke travels in the direction shown. What causes the smoke to move?

May/June 2018

Which statement gives the way thermal energy is moved through a liquid by convection?

May/June 2023

Water is in a glass beaker. If the middle of the base of the beaker is heated, a convection current forms. Which statement accounts for this?

May/June 2024

A beaker containing cold water is warmed at the bottom. What occurs to the water that is heated?

May/June 2025

In which states of matter does convection take place?

Oct/Nov 2016

A teacher shows convection in a liquid using a glass tube, as in Fig. 1.1. The tube is filled with water and left undisturbed for ten minutes. A purple crystal is then put into the mouth of the tube. This crystal dissolves and makes the water around it turn purple. The tube is then heated gently, as shown in Fig. 1.1.

Oct/Nov 2018

The diagram depicts a glass tube containing water, hung above a bench. The water can move freely around the tube. At point $P$, a convection current is travelling downwards. At which point should the tube be heated to produce this convection current?

Oct/Nov 2020

Fig. 3.1 shows a hot water tank fitted with two electric heaters X and Y. Heater X operates in the daytime, whereas heater Y is used only at night, when electricity is cheaper.

Oct/Nov 2020

The diagram illustrates the interior of a refrigerator. As soon as the refrigerator is turned on, what happens to the air close to the cooling unit?

Oct/Nov 2021

The diagram illustrates the interior of a refrigerator. When the refrigerator is turned on for the first time, what happens to the air close to the cooling unit?

Oct/Nov 2021

The diagram illustrates a radiator heating the air in a room. What is this process called?

Oct/Nov 2022

A torn sheet from an exercise book is shown. “As the average kinetic energy of the molecules drops, the distance between them decreases and they move downwards.” What process does this describe?

Oct/Nov 2024