WorksheetsWater Quiz
Total questions: 54
Worksheet time: 27mins
What is the chemical formula for water?
H2O
CO2
NaCl
O2
Why is it rare to find pure water?
Water is a weak solvent.
Water is a very powerful solvent.
Water is always mixed with salt.
Water cannot dissolve substances.
What can water do over time to almost anything?
Freeze, melt, evaporate
Erode, corrode, absorb
Harden, solidify, crystallize
Burn, ignite, combust
What happens to water when it is heated to temperatures up to 100°C?
It contracts by 4% of the system contents.
It expands by up to 4% of the system contents.
It turns into steam and expands 1,600 times.
It remains unchanged.
At what temperature does water turn to steam and expand significantly?
50°C
75°C
100°C
150°C
By how much can water expand when it turns to steam?
4 times its original volume
16 times its original volume
160 times its original volume
1,600 times its original volume
What is the standard unit for measuring temperature when considering the effect of heat on a space or object?
Fahrenheit
Kelvin
Celsius
Rankine
Which temperature scale is often used to measure an increase in temperature?
Fahrenheit
Kelvin
Celsius
Rankine
What is the relationship between Celsius and Kelvin increments?
Celsius increments are larger
Kelvin increments are larger
They are the same
They are unrelated
What is 0 Kelvin equivalent to in Celsius?
0°C
-273°C
100°C
273°C
What happens to molecular bonds as water is heated?
They strengthen and molecules become less active.
They weaken and molecules become more active.
They remain unchanged and molecules stay the same.
They disappear completely.
How are ice molecules arranged compared to steam molecules?
Ice molecules are spread further apart than steam molecules.
Ice molecules are tightly packed together, while steam molecules are spread further apart.
Ice molecules are more active than steam molecules.
Ice molecules are less dense than steam molecules.
What is the boiling point of water at sea level?
0°C
4°C
100°C
273°C
By what percentage does water expand from 4°C to 99°C?
2%
4%
6%
8%
How many times does steam expand compared to water?
1,000 times
1,200 times
1,600 times
2,000 times
At what temperature does ice expand by 10%?
0°C or 273°K
4°C
100°C
99°C
What happens to the boiling point of water when the pressure is increased?
It decreases.
It remains the same.
It increases.
It fluctuates randomly.
At what pressure does the boiling point of water reach approximately 200°C according to the graph?
1 bar
5 bar
10 bar
20 bar
What is sensible heat?
Heat required to change water to steam
Heat required to raise the water temperature without changing its state
Heat required to cool water
Heat required to freeze water
What happens when latent heat is applied to water?
The water temperature rises without changing state
The water changes from liquid to steam
The water freezes
The water cools down
What type of heat is required to keep water boiling?
Sensible heat
Latent heat
Radiant heat
Conductive heat
What is sensible heat?
Heat that changes the state of a substance
Heat that raises the temperature without changing the state
Heat that is lost to the environment
Heat that is absorbed by the surroundings
What happens to water when latent heat is applied?
It remains in the same state
It cools down
It changes from water to steam
It freezes
What type of heat is required to keep water boiling?
Sensible heat
Latent heat
Radiant heat
Conductive heat
What characteristic does water develop due to its ability to erode, corrode, and absorb dissolve?
Hardness or softness
Color or clarity
Temperature or pressure
Density or volume
What is another characteristic of water related to its ability to erode and corrode?
Acid or alkaline
Hot or cold
Light or heavy
Fast or slow
What is the term used to describe the factor that affects the amount of soap needed for a lather in water?
Soap enhancing factor
Soap destroying factor
Soap neutralizing factor
Soap balancing factor
What type of hardness in water can be removed by heating the water above 65°C?
Permanent hardness
Temporary hardness
Total hardness
Chemical hardness
What compound is responsible for temporary hardness in water?
Calcium sulphates
Magnesium chlorides
Calcium carbonates
Sodium bicarbonates
Which method is used to remove permanent hardness in water?
Filtration
Distillation
Base exchange method
Boiling
What happens to temporary hard water when it is heated to 65°C and above?
It becomes very soft water.
It forms limescale (calcium carbonate).
It turns into permanent hard water.
It dissolves limestone completely.
What is a potential problem caused by the formation of limescale in appliances?
Increased water pressure.
Enhanced appliance efficiency.
Problems for appliances and reduced efficiency.
Improved water taste.
What does the pH scale measure in water?
Temperature
Potential hydrogen
Salinity
Hardness
What pH value is considered neutral for water?
5
6
7
8
What type of water is likely to cause acidic corrosion and pitting?
Neutral water
Alkaline water
Acidic water
Distilled water
What is a potential effect of alkaline water?
Acidic corrosion
Neutral pH
Limescale, blocking less efficient
Increased salinity
What is the primary purpose of a water softener?
To increase water pressure
To remove hard water and prevent scale, scum, and tide marks
To add minerals to water
To filter out bacteria
What materials are used in the bed of a water softener to hold calcium and magnesium?
Sand and gravel
Zeolite or resin
Charcoal and carbon
Clay and silt
What solution is used to back-wash a water softener unit?
Vinegar solution
Brine solution (salt or sodium chloride)
Baking soda solution
Lemon juice solution
What is the primary function of polyphosphate chemicals in water treatment?
To soften the water
To stabilize salts and prevent scale
To increase water temperature
To filter out impurities
What do salt crystals tend to do in untreated water?
Dissolve completely
Bind together to form hard scale
Evaporate
Turn into gas
Where are polyphosphate chemicals commonly used?
In swimming pools
In combination boilers
In air conditioning units
In refrigerators
What is the purpose of a magnetic scale inhibitor in plumbing?
To heat the water
To filter out impurities
To break down salt crystals
To increase water pressure
How does a magnetic scale inhibitor alter the water?
It changes the color of the water
It alters the physical nature of the water
It increases the water's temperature
It adds minerals to the water
What does an electrical scale inhibitor use to produce low level radio waves?
Magnetic field
Electric current
Chemical reaction
Heat energy
What materials are used in a galvanic cell scale inhibitor to form an electron flow?
Zinc and copper
Iron and nickel
Aluminum and tin
Silver and gold
In a galvanic cell scale inhibitor, which component acts as the anode and breaks down?
Copper
Zinc
Nylon
Iron
What is the term for water's ability to dissolve lead?
Cuprosolvent
Adhesiveness
Plumbosolvent
Cohesiveness
What is the term for water's aggressiveness towards copper?
Plumbosolvent
Cuprosolvent
Adhesiveness
Cohesiveness
What is the term for water's ability to cling to solids?
Cohesiveness
Cuprosolvent
Adhesiveness
Plumbosolvent
What is the term for water's ability to cling to itself?
Adhesiveness
Cohesiveness
Cuprosolvent
Plumbosolvent
What property of water allows a glass to be filled above the rim?
Adhesiveness
Cuprosolvent
Cohesiveness
Plumbosolvent
What is one problem plumbers face due to capillary action of water?
Water can be drawn up underneath the lead weathering on tiles, resulting in water leaking inside the property.
Water can be drawn up through concrete walls.
Water can evaporate quickly from surfaces.
Water can cause metal pipes to rust.
Which of the following is a result of capillary action in plumbing?
Loss of trap seal (S trap) under an appliance.
Increased water pressure in pipes.
Decreased water temperature.
Formation of air bubbles in water.
