WorksheetsMTL2 Science Learner Outcome 2
Total questions: 39
Worksheet time: 20mins
What is the reference material used to calculate the relative density of solids and liquids?
Air
Copper
Water
Lead
Which of the following gases is heavier than air?
Hydrogen
Helium
Methane
Propane
What is the relative density of copper if its density is 8920 kg/m³?
0.892
8.92
892
89.2
Which material has a relative density less than 1 and is therefore lighter than water?
Lead
Polypropylene
Brass
Steel
What does a specific gravity of less than 1 indicate about a gas?
It is heavier than air
It is flammable
It is lighter than air
It is toxic
Which of the following is a pure metal commonly used in plumbing?
Brass
Copper
Bronze
Gun metal
What is the main difference between ferrous and non-ferrous metals?
Ferrous metals are more expensive
Non-ferrous metals contain iron
Ferrous metals contain iron
Non-ferrous metals are magnetic
Which alloy is made from copper and zinc and is commonly used for fittings?
Bronze
Gun metal
Brass
Stainless steel
Which of the following is a characteristic of ferrous metals?
They do not rust
They contain iron and form rust in air and water
They are non-magnetic
They are resistant to corrosion
Which plastic type can be reheated and reshaped multiple times?
Thermosetting plastic
Fibre glass
Thermoplastic
Plastic
Which material is commonly used for sanitary appliances like WCs and wash basins?
Fireclay
Vitreous China
ABS
Stainless steel
Which plastic is used for underground cold water mains and is coloured blue?
HDPE
Polypropylene
MDPE
Polybutylene
Which of the following is a non-ferrous metal used in plumbing for fittings and components?
Steel
Iron
Brass
Cast iron
What does the property of hardness describe in a material?
Its ability to conduct electricity
Its resistance to being cut, deformed, or bent
Its ability to absorb heat
Its flexibility under pressure
Which property refers to a material’s ability to absorb energy without breaking or fracturing?
Elasticity
Toughness
Ductility
Malleability
What is ductility best described as?
The ability to resist twisting
The ability to be stretched into a wire without breaking
The ability to return to original shape after bending
The ability to resist crushing forces
Which material property is most important when selecting materials for electrical wiring?
Tensile strength
Heat resistance
Electrical conductivity
Shear strength
What does malleability refer to in a material?
Its ability to resist corrosion
Its ability to be hammered or shaped without cracking
Its ability to conduct heat
Its ability to stretch and return to original shape
What is the key factor that contributes to atmospheric corrosion?
Sunlight
Moisture from rain, fog, dew, and humidity
Wind speed
Temperature alone
Which acid is formed when water combines with carbon dioxide in the atmosphere?
Sulphuric acid
Hydrochloric acid
Nitric acid
Carbonic acid
What type of corrosion occurs when two dissimilar metals are in contact through an electrolyte?
Electrolytic corrosion
Erosion corrosion
Galvanic corrosion
Pitting corrosion
Which type of corrosion is caused by fast-flowing, turbulent fluids in pipework?
Pitting corrosion
Galvanic corrosion
Erosion corrosion
Oxidation
What protective layer forms on copper when it oxidises in the atmosphere?
Rust
Ferrous oxide
Patina
Sulphur coating
What type of corrosion is encouraged by low flow rates in partially filled pipework?
Galvanic corrosion
Erosion corrosion
Pitting corrosion
Microbial corrosion
Which best practice helps prevent turbulent flow and erosion corrosion in pipework?
Using acid-based flux
Leaving pipe ends uncapped
Deburring and re-rounding cut pipe ends
Over-tightening compression fittings
Which plastic is highly susceptible to UV degradation from sunlight exposure?
PVC
Polypropylene
ABS
MDPE
What is a common effect of thermal degradation in plastics?
Increased ductility
Colour fading and cracking
Improved heat resistance
Reduced water absorption
Which of the following should be avoided to prevent corrosion in plumbing systems?
Using inhibitors in central heating systems
Applying flux only to pipe ends
Leaving systems partially filled with water
Flushing out systems before use
Which fluid is known as the "universal solvent" due to its ability to mix and dilute other substances?
Refrigerant
Glycol
Water
Fuel oil
Which fluid is used in heat pumps and air conditioning systems due to its low boiling point?
Fuel oil
Lubricant
Refrigerant
Glycol
What is the primary use of silicon grease in plumbing installations?
Preventing corrosion in metal pipes
Lubricating rubber seals in push-fit plastic joints
Cleaning copper pipework
Sealing threaded metal joints
Which fuel oil is commonly used in domestic oil boilers and appliances?
Diesel
Petrol
Kerosene
Ethanol
What is the chemical composition of a water molecule?
H₂O₂ – two hydrogen, two oxygen
HO – one hydrogen, one oxygen
H₂O – two hydrogen, one oxygen
OH₂ – one oxygen, two hydrogen
What happens to water when it freezes at 0°C?
It contracts by 10%
It expands by 10%
It remains the same volume
It evaporates
Which type of water causes scaling in pipes and boilers and can be softened by boiling?
Soft water
Permanently hard water
Temporarily hard water
Distilled water
What is the pH value of neutral water?
0
7
14
10
Which gas is commonly used in pipe freezing kits in plumbing?
Nitrogen
Carbon dioxide
Methane
Propane
According to Boyle’s Law, what happens to the pressure of a gas if its volume is halved at constant temperature?
Pressure is halved
Pressure remains the same
Pressure doubles
Pressure drops to zero
Which of the following gases is inert and found in small quantities in natural gas?
Methane
Ethane
Nitrogen
Hydrogen
