WorksheetsPlumbing principles
Total questions: 20
Worksheet time: 10mins
Convection occurs as a result of
heat travelling through a solid
differences in the density of solids
differences in the density of liquids and gases
heat travelling through air to an object
Copper has a specific heat capacity of 0.385KJ/kg °C
The amount of heat energy needed to heat 1kg of copper by 2°C is
0.385 KJ
3.85 KJ
0.77 KJ
7.7 KJ
Which of the following materials expands the most when heated?
PVC
Steel
Lead
Copper
The highest rate of heat conductivity is found in
Lead
Copper
Aluminium
Iron
Which of the following formulae should be used to calculate the mass of a substance?
Mass = mass x volume
Mass = volume / density
Mass = density x volume
Mass = density / volume
Relative density is the
volume of water displaced when a substance is placed in water
density of a substance in comparison to the density of water
mass of a substance divided by it's volume
force exerted by the mass of a substance
The Pascal is a unit of intensity of pressure which can be calculated by multiplying
Newtons (N) and kilograms (kg)
Newtons (N) and litres (L)
Kilograms (kg) and square metres (m²)
Newtons (N) and square metres (m²)
A cubic metre of water weighs 1000Kg - what is its relative density?
1
1000
10
1000 litres
For substance to float on water its relative density must be less than
1
0.5
1.5
2
Which of the following water installations is limescale MOST likely to be associated with?
Hot water draw off
Rising main
Drinking water draw off
Pumped pressure shower
The necessary constituents for combustion to take place are
carbon dioxide, fuel and electricity
oxygen, fuel and heat
air, fuel and electricity
nitrogen, fuel and heat
Which of the following is NOT a ferrous metal
Zinc
Mild steel
Wrought iron
Cast iron
Hard water is due to
acidity
alkalinity
pollution
salinity
Between which two metals is electrolytic corrosion most pronounced?
Copper and aluminium
Iron and zinc
Aluminium and magnesium
Copper and lead
The PH value shows which property of water?
How heat conductive it is
The degree of acidity or alkalinity present
How electrically conductive it is
How many metals are present
With reference to fuel gases
propane is heavier than air
butane is lighter than propane
methane is heavier than air
butane is lighter than air
A water tank 4m above another lower water tank (size 3m x 1.2m x 1.0m), will exert a pressure on the lower tank of?
4m x 9.81KN/ m²
9.81 Pascals
2 3 x 1.2 x 1 x 9.81 KN/m²
2 9.81 KN/m²
At what temperature does water reach its maximum density?
0°C
4°C
1°C
8°C
A water storage tank measures 2.75m long X 2.4m wide X 2.25m deep. The water depth within the tamk is 2.0m. The pressure exerted by 1m³ of water is 9.81 kN/ m².
Which calculation gives the total pressure exerted on the base of the tank?
9.81 kN/m² X 2.0m
2.75m X 2.4m X 9.81 kN/m²
2.75m X 2.4m X 9.81 kN/m²
2.00m X 9.81 kN/m² X 2.75m X 2.4m
Boilers are susceptible to hard scale build up on the inside, this can lead to overheating and also wastes fuel. This problem is normally caused by?
Build up of rust on boiler plates
Temporary hard water
Permanent hard water
Excessive use of inhibitor
