Scientific Principles Plumbing

A cold water storage cistern contains 250 litres when filled to its working capacity. If the base of the cistern measures 600 mm by 1200 mm, what pressure will be exerted by the cistern on the base beneath it?

• 1765 N/m²

• 2542 N/m²

• 3406 N/m²

• 3740 N/m²

Which of the following measurements is a base SI unit?

• kg

• m/s

• N/m²

• l/s

Which of the following components is manufactured from a pure metal?

• 22 mm end feed elbow

• Double panel, single convector, welded seam radiator

• Lead-free solder

• 15 mm type A compression coupling

Which of the following statements describes the ductility of a material?

• Its ability to be stretched without breaking

• Its ability to conduct heat

• Its ability to resist atmospheric corrosion

• Its ability to return to its original shape once released from tension

If 0.150 m³ of water were heated beyond its boiling point, what volume of steam would be produced?

• 0.150 m³

• 150 m³

• 0.240 m³

• 240 m³

What is the unit of heat?

• Joule

• Kelvin

• Ampere

• Watt

What size of earthing cable should be used to bond gas and water mains pipework?

• 4 mm²

• 6 mm²

• 8 mm²

• 10 mm²

When different metals are present together in a system of pipework, which of the following types of corrosion is likely to occur?

• Erosion

• Oxidic

• Atmospheric

• Electrolytic

In an old hot water system that does not use a pump, how is heat transferred from the boiler to the cylinder?

• Conduction

• Convection

• Impulse

• Radiation

How does water grip the side of a beaker or pipe?

• Adhesion

• Gravity

• Cohesion

• Convection