ENVIRONMENTAL ENGINEERING QUIZ

Which of the following retards the self purification of stream?

Satisfying oxygen demand

None of these

Sunlight

Higher temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

40 mm/hr

10 mm/hr

20 mm/hr

4 mm/hr

TRUE ANSWER : ?
YOUR ANSWER : ?

The treatment of water with bleaching powder is known as

Hypo-chlorination

Super chlorination

De-chlorination

Pre-chlorination

TRUE ANSWER : ?
YOUR ANSWER : ?

The process of lagooning is primarily a means of

Disposing of sludge

Increasing flow of sewage through imhoff tanks

Increasing the capacity of storage reservoirs

Reducing the excessive flow in sewers

TRUE ANSWER : ?
YOUR ANSWER : ?

Standard BOD is measured at

30°C - 5 day

25°C - 3 day

20°C - 1 day

20°C - 5 day

TRUE ANSWER : ?
YOUR ANSWER : ?

Residual chlorine in water is determined by

Both (A) and (B)

Starch iodide method

None of these

Orthotolidine method

TRUE ANSWER : ?
YOUR ANSWER : ?

In chlorination, with the rise in temperature of water, death rate of bacteria

None of these

Increases

Decreases

Remains unaffected

TRUE ANSWER : ?
YOUR ANSWER : ?

Period of cleaning of slow sand filters is about

10 - 12 days

1 - 2 year

24 - 48 hours

2 - 3 months

TRUE ANSWER : ?
YOUR ANSWER : ?

Most suitable section of sewer in separate sewage system is

Modified egg shaped section

Rectangular section

Standard form of egg shaped sewer

Circular section

TRUE ANSWER : ?
YOUR ANSWER : ?

For a given discharge, the efficiency of sedimentation tank can be increased by

Increasing the surface area of tank

Increasing the depth of tank

Decreasing the surface area of tank

Decreasing the depth of tank

TRUE ANSWER : ?
YOUR ANSWER : ?

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