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WorksheetsL2 Scientific Principles MOCK
Total questions: 20
Worksheet time: 10mins
Which of the following pipes, each measuring 6m in length, will offer the greatest resistance to the flow of water?
15mm pipe with four elbows
15mm pipe with four machine bends
22mm pipe, which reduces down to 15mm halfway along its length
d. 15mm pipe with two machine bends and two elbows.
What is the intensity of pressure acting at the base of a 7m long pipe, which has a head height of 3 meters (the cistern at the head of this pipe measures 500mm x 500mm x 500mm)?
19.81kPa
24.67kPa
29.43kPa
32.49kPa
Conduction occurs by:
Heat travelling in a straight line through the air
Heat travelling through or along a solid material
Heat travelling via a chemical reaction
Heat travelling via the motion of a fluid.
What is the freezing point of water at sea level?
100 0C
75 0C
25 0C
0 0C.
Which of the following materials is the best conductor of heat?
Lead
Low carbon steel
Copper
Cast iron.
With a downward pressure of 100kPa and a head of 10m, what would be the approximate pressure in bar?
100 bar
50 bar
10 bar
1 bar.
What would the fuse size be for a domestic appliance that has a power rating of 3kW?
13 amp
10 amp
5 amp
3 amp.
Which of the following values reflects the pH value for pure water?
1
4
7
11.
The limescale build-up in systems is caused by:
Soft water
Acidic water
Temporary hard water
Permanently hard water.
A change of state may occur when water is heated to:
25 0C
50 0C
75 0C
100 0C.
The SI unit for measuring electrical current is:
Watt
Ampere
Joule
Ohm.
Specific heat capacity is measured in:
N/m2
0C or 0K
KJ/Kg/0C
Amperes.
What would an anti-capillary groove in a lead weathering stop?
Water being drawn into the building
Corrosion of the lead
The lead from sliding out of place
Expansion and contraction.
What has a sinusoidal wave form?
DC electricity
AC electricity
Convection heat transfer
Conductive heat transfer.
If a customer painted their central heating pipework, what would that protect it from?
Pitting
Electrolytic corrosion
Atmospheric corrosion
UV corrosion.
On an incoming mains, which of the following would have the lowest pressure?
The cold water tap at the kitchen sink
The float-operated valve to the cold water storage cistern in the loft
The first floor basin cold tap
The downstairs WC float-operated valve.
The build-up of limescale in a hot water system could be noticed by:
The hot water temperature being hotter
The hot water temperature being cooler
The hot water flow rate increasing
The hot water recovery time decreasing.
What is this symbol for?
DC Electricity
System circulator
Electrical resistance
AC electricity
Which of the following will cause syphonage to occur?
Suction at point C
Increase in pressure at point B
Suction at point A
Atmospheric pressure in the tube.
This form of corrosion is generally caused by:
Flux left in the tube after flushing out
The inhibitor in the system being too strong
Position of the electrolytic series table
Bad manufacture.
