
D56 MASTER THE DAY
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Professional Development
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101 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which process removes fine suspended and colloidal particles from water after sedimentation?
Answer explanation
Filtration removes very fine colloidal and suspended particles after sedimentation.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which coagulant is most commonly used in water treatment?
Answer explanation
Alum (Aluminum sulphate) is the most commonly used coagulant.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In slow sand filters, what is the effective size of sand particles?
Answer explanation
Slow sand filters use sand particles with effective size between 0.2–0.4 mm.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which method is used for cleaning rapid sand filters?
Answer explanation
Backwashing is used for cleaning rapid sand filters.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which disinfectant method is most commonly used in public water supplies?
Answer explanation
Chlorination is widely used for disinfecting public water supplies due to cost and effectiveness.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The pH range suitable for Alum as a coagulant is:
Answer explanation
Alum works best in a pH range of 6.5–8.5.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the cleaning method in a slow sand filter?
Answer explanation
Slow sand filters are cleaned by scraping the top layer of sand.
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