What is the normal boiling point of water?

• 85°C

• 95°C

• 100°C

• 111°C

At what temperature does water reach its maximum density?

• -10°C

• -1°C

• 4°C

• 7°C

The pressure exerted by a liquid in the following diagram can be described as moving in:

• an outwards direction only.

• an upwards direction only.

• a downwards direction only.

• downwards and outwards directions.

Which one of the following appliances can operate using siphonic action?

• Shower mixer

• Bidet

• WC cistern flush device

• Washing machine

Two-bar pressure is equal to approximately how many metres’ head of water?

• 0.1 metres

• 2.0 metres

• 20 metres

• 200 metres

The temperature of water in a pipe can be measured using a:

• cylinder thermostat.

• multi-meter.

• digital thermometer.

• weir cup.

If the temperature of water increases, the water’s:

• density decreases.

• density stays constant.

• density increases.

• mass increases.

Panel radiators in a central-heating system transfer heat to a room mainly by the principle of:

• capillarity.

• conduction.

• radiation.

• convection.

Circulation in the following diagram is by:

• capillarity.

• conduction.

• convection.

• radiation.

Limescale build-up in a plumbing system is caused by:

• soft water.

• acidic water.

• untreated water.

• hard water.