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WorksheetsCA 2 Environmental Engineering
Total questions: 20
Worksheet time: 10mins
Which of the following is not a method of water distribution?
Gravity system
Pumping system
Combined system
Vacuum system
What is the IS Code of practice for water supply in buildings?
IS 1172-1993
IS 2065-1983
IS 800-2007
IS 383-1970
Air valves are located at:
Dead ends
Low points
Summit points
Near hydrants
Radial system is generally suitable for:
Villages
Cities with circular roads
Towns with central main source
Small towns only
Which type of valve prevents backflow in water mains?
Gate valve
Check valve
Air valve
Scour valve
The most common shape of sewer for combined flow is:
Circular
Rectangular
Egg-shaped
Trapezoidal
A lamp hole is provided for:
Inspection with light
Ventilation
Cleaning
Sewage storage
Which gas causes foul smell in sewers?
CO₂
CH₄
H₂S
SO₂
The function of intercepting trap is to:
Remove grease
Prevent entry of sewer gases into house
Collect storm water
Store sewage temporarily
Which factor is considered in estimation of storm water flow?
Rainfall intensity
Runoff coefficient
Catchment area
All of these
How is Chemical Oxygen Demand (COD) calculated?
Waste water is oxidised chemically using strontium in acid solutions
Waste water is oxidised chemically using bromine in acid solutions
Waste water is oxidised chemically using dichromate in acid solutions
Waste water is oxidised chemically using sodium in acid solutions
Grit chamber removes:
Fine suspended solids
Colloids
Oil and grease
Sand and gravel
The solid particles settled at the bottom of sedimentation tank are called:
Scum
Sludge
Grit
Grease
Coagulation in sewage treatment is carried out to remove:
Colloidal matter
Pathogens
Grease
Grit
What is the waste water from kitchen sinks called?
Brown water
Yellow water
Black water
Grey water
What is the full form of BOD?
Biochemical oxygen demand
Bionatal oxygen demand
Biological disease
Biological oxygen deficiency
Conventionally, the biochemical oxygen demand is measured for how many days?
3 days
4 days
5 days
7 days
If the BOD of a town is 25000 kg/day and BOD per capita per day is 50 grams, what is the population equivalent of the town?
10000
50000
250000
500000
Which of the following is NOT a possible meaning for the abbreviation BOD?
Biochemical oxygen demand
Bionatal oxygen demand
Biological disease
Biological oxygen deficiency
A town has a BOD per capita per day of 50 grams. If the total BOD load is 25000 kg/day, which calculation would you use to find the population equivalent?
Divide 25000 by 50 and multiply by 1000
Multiply 25000 by 50
Divide 25000 by 50
Add 25000 and 50
