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15 questions
Only some living things need water to survive.
True
False
Singapore is a small country but we have a lot of space to collect and store water.
True
False
Singapore must have a ......... water supply to meet our national needs.
temporary
reliable
extra
Rainwater is collected through a network of drains, canals and r........
Rainwater from local catchment and imported from Johor must be chemically treated, ......... and disinfected.
filtered
boiled
evaporated
The National Taps are water from local catchment, imported water, NEWater and .......
waste water from industry
desalinated water
water from Johor
The three step process to obtain treated used water in NEWater plants are microfiltration, reverse osmosis and ………….
distillation
ultraviolet disinfection
evaporation
In the NEWater production, the water is first purified using microfiltration. What substance(s) is(are) removed ?
Microscopic particles only
Bacteria only
Microscopic particles and bacteria
In reverse osmosis, it is optional for pressure to be present in this process.
True
False
In the final stage of NEWater treatment, reverse osmosis process purify the water which includes removing undesirable contaminants including viruses.
True
False
Pure drinking water obtained from seawater is through the ………. process.
Desalination is a sustainable process of obtaining drinking water.
True
False
In Singapore, desalination is carried out using …….
distillation.
boiling.
reverse osmosis.
osmosis
Distillation is NOT used to obtain drinking water from seawater because a large amount of fuel is needed to heat up the seawater hence uses up a lot of …..
Water is passed through ultraviolet light to destroy remaining bacteria and viruses. ….. are then added to the water to meet the quality requirements for use.
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