Plumbing Science

Question 2

What is the SI base unit for mass?

Answer 2

Kilogram (kg)

Question 3

Which SI base unit is used to measure electrical current?

Answer 3

Ampere (A)

Question 4

What is the SI derived unit for area?

Answer 4

Square metre (m²)

Question 5

What is the specific gravity of air?

Answer 5

1.000

Question 6

How is relative density of a gas measured?

Answer 6

Against air, which is given a value of 1

Question 7

What is the relative density of copper?

Answer 7

8.89

Question 8

Name a non-ferrous metal used in plumbing.

Answer 8

Copper

Question 9

What is an alloy of copper and zinc called?

Answer 9

Brass

Question 10

What does uPVC stand for?

Answer 10

Unplasticised Polyvinyl Chloride

Question 11

What is the main disadvantage of thermoplastics in cold conditions?

Answer 11

They become brittle and may fracture.

Question 12

What is the term for corrosion caused by two dissimilar metals in contact?

Answer 12

Galvanic corrosion

Question 13

What is the green coating on weathered copper called?

Answer 13

Patina

Question 14

What does the Bernoulli Effect describe?

Answer 14

The inverse relationship between velocity and pressure in fluids

Question 15

What is the unit of pressure in the SI system?

Answer 15

Pascal (Pa)

Question 16

What is the pressure equivalent of 10m head of water?

Answer 16

1 bar

Question 17

What does SHC stand for?

Answer 17

Specific Heat Capacity

Question 18

What is the SHC of water?

Answer 18

4.19 kJ/kg°C

Question 19

How many joules are in 1 watt-hour?

Answer 19

3600 J

Question 20

What is latent heat?

Answer 20

Heat required for a change of state without a temperature change

Question 21

What is sensible heat?

Answer 21

Heat that causes a change in temperature

Question 22

What law states that gas volume increases with temperature?

Answer 22

Charles’ Law

Question 23

What does Boyle’s Law state?

Answer 23

Pressure and volume of gas are inversely proportional

Question 24

What does the Kelvin scale start at?

Answer 24

Absolute zero (-273°C)

Question 25

What gas is heavier than air: propane or methane?

Answer 25

Propane

Question 26

What is the term for the ability of water to climb narrow spaces?

Answer 26

Capillarity

Question 27

What causes pitting corrosion in heating systems?

Answer 27

Localised electrochemical reactions

Question 28

Which plastic is most susceptible to UV damage?

Answer 28

Polypropylene

Question 29

What causes water hardness?

Answer 29

Dissolved calcium and magnesium salts

Question 30

Which component of electricity is measured in Ohms?

Answer 30

Resistance

Question 31

What unit is used to measure electric power?

Answer 31

Watt (W)