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Worksheets6035 Scientific Principles quiz 1
Total questions: 40
Worksheet time: 20mins
Which one of the following actions would increase the flow-rate in a pipework system made from low carbon steel?
Remove any unnecessary elbows
Increase the size of the fittings
Increase the number of fittings
Reduce the pipework bore
Ten metres of pressure is approximately equivalent to:
0.1 bar
1.0 bar
10 bar
100 bar
Refer to the diagram shown of a cold water installation. Which point would experience the highest pressure?
Point A
Point B
Point C
Point D
Which of the following is a unit of pressure?
Pascal
Kg/m²
m/s
l/s
Which of the following identifies the preferred method for treating hard water in a domestic dwelling?
Install a water conditioner
Power flush the system
Convert the system to indirect
Treat the system with an inhibitor
Temporary hard water could create which one of the following problems in hard water systems?
Electrolytic corrosion
Risk of leakage
Lime-scale deposits
Atmospheric corrosion
Which one of the following minerals is present in temporarily hard water?
Sodium Chloride
Calcium Carbonate
Copper Oxide
Potassium
When water freezes its volume increases by approximately:
5%
10%
15%
20%
Which one of the following is the unit of measurement of electrical current?
Ohm
Watt
Volt
Amp
Which one of the following states the approximate gross calorific value of natural gas?
39 MJ/m³
49 MJ/m³
85 MJ/m³
485 MJ/m³
Which of the gases listed below has the highest combustion rate?
Propane
Natural Gas
Nitrogen
Butane
A fuel supply and source of ignition is required for combustion to occur. What else is also required?
Carbon Monoxide
Carbon Dioxide
Nitrogen
Oxygen
Which one of the following will occur when mains cold water pipework is not insulated in close proximity to heating pipework?
Condensation
Convection
Combustion
Conduction
Which one of the following identifies a method of increasing hot water system efficiency?
Increasing system pressure
Increasing system flow rate
Adding corrosion inhibitor
Installing pipework insulation
Which one of the following materials will typically absorb the greatest amount of radiant heat?
Cast iron
Polished copper
Galvanised steel
Polished aluminium
Reducing the diameter of pipework within a system with a constant supply pressure would lead to:
An increase in the speed of water after the pipe reduction
An increase in the supply pressure at the lowest point
A reduction in the pressure after the pipe reduction
Back pressure on the system at the highest point
Which one of the following uses the principle illustrated by the image in a positive manner?
WC Cistern
Float operational valve
Pressure reducing valve
Soldered copper fittings
Kelvin is a unit of which one of the following:
Temperature
Force
Density
Pressure
In order to calculate the energy required to raise 1kg of material by 1 degree Celsius, this must be multiplied by which factor for the material?
Specific heat capacity
Thermal conductivity
Temperature difference
Pressure
Radiators transfer heat by what main method?
Radiation
Retraction
Conduction
Convection
“A substance absorbing heat without changing temperature”. This statement best describes which one of the following:
Specific heat
Latent heat
Heat capacity
Sensible heat
Water would be at its maximum density at which of the following temperatures?
100 degrees C
10 degrees C
20 degrees C
4 degrees C
Which of the following is used to calculate a cartridge fuse rating?
Amps = watts x volts
Volts = watts x amps
Amps = watts - volts
Amps = watts/volts
The term ‘AC’ stands for which one of the following when referring to electrical supply?
Amplified current
Ampere current
Alternating current
Associated current
Condensation is best described as which one of the following?
Liquid turning into a gas
Liquid turning into a solid
Gas turning into a liquid
Solid turning into a gas
1 metre³ of water at 4°C has a mass of 1000kg. What would be its relative density?
1
10
100
1000
Molten solder is drawn into an end-feed fitting by which one of the following?
Siphoning action
Atmospheric pressure
Capillary action
Adhesion
Which one of the following materials used in building services engineering could suffer from atmospheric corrosion?
Brass
PVC
Low carbon steel
Stainless steel
The device fitted in a hot water cylinder to prevent corrosion is called the:
Sacrificial anode
Sacrificial cathode
Water softener
Water conditioner
The additive used to prevent corrosion in a wet central heating system is called the corrosion:
Conditioner
Softener
Reducer
Inhibitor
The freezing point of water at sea level is?
-10°C
0°C
4°C
10°C
In order to calculate the linear expansion of a material, the coefficient of expansion must be multiplied by which one of the following two variables?
Original temperature and mass of material
Expanded length and mass of material
Temperature rise and density of the material
Original length and temperature rise
The term 'heat conductivity' is best defined by the ability to do which?
Increase the amount of heat energy stored in a material
Expand when energy is applied to a material
Generate heat from a material's surroundings
Transmit heat through the material
Liquid is drawn between two adjacent surfaces by which of the following?
Siphoning action
Atmospheric pressure
Capillary action
Adhesion
Which one of the following identifies a common means of providing DC supply?
Batteries
Alternator
Power station
Static inverter
A central heating installation is taking place at a large school. In order to minimise mechanical damage, which one of the following pipework materials would be the most suitable for connections to radiators?
Copper
Plastic
Low carbon steel (LCS)
Stainless steel
White panelled radiators are manufactured using which one of the following materials?
Copper
Steel
Brass
Gunmetal
Which one of the following materials is the most malleable?
Low carbon steel
Cast iron
Copper
Lead
Which one of the following indicates the definition of specific heat capacity?
The amount of molecules present in 1 litre of water at 1°C
The amount of pressure present in 1 litre of water at 1°C
The amount of heat required to raise 1kg of a substance by 1°C
The amount of heat required to maintain a temperature of 1°C for 1 minute
At what temperature does water change state from a liquid to a solid?
10°C
90°C
273K
373K
