Page 207 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 3 Scientific principles

Test your knowledge

1 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?
a 176.5 N/m 2
b 245.2 N/m 2
c 340.0 N/m 2
d 347.0 N/m 2
2 Which of the following measurements is a base SI unit?
a kg
b m/s

c m 2
d l/s
3 Which of the following components is manufactured from a pure metal?
a 22 mm end feed elbow
b Double panel, single convector, welded seam radiator
c Lead-free solder
d 15 mm type A compression coupling
4 Which of the following statements describes the ductility of a material?
a Its ability to be stretched without breaking
b Its ability to conduct heat
c Its ability to resist atmospheric corrosion

d Its ability to return to its original shape once released from tension
5 If 0.150 m of water were heated beyond its boiling point, what volume
3
of steam would be produced?
a 0.150 m 3
b 150 m 3
c 0.240 m 3
d 240 m 3
6 What is the unit of heat?
a Joule
b Watt
c Kelvin
d Ampere

7 What does the term ‘potential difference’ refer to?
a Voltage
b Amperage
c Resistance
d Power

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