ENVIRONMENTAL ENGINEERING QUIZ

The polluted water is one which

Consists of undesirable substances rendering it unfit for drinking and domestic use

Is contaminated

Contains pathogenic bacteria

Is safe and suitable for drinking and domestic use

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following retards the self purification of stream?

Higher temperature

Satisfying oxygen demand

None of these

Sunlight

TRUE ANSWER : ?
YOUR ANSWER : ?

The detention period for oxidation ponds is usually kept as

48 hours

3 months

24 hours

10 to 15 days

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following compounds is widely used for algae control?

Sodium sulphate

Calcium chloride

Sodium chloride

Copper sulphate

TRUE ANSWER : ?
YOUR ANSWER : ?

If the sewage contains grease and fatty oils, these are removed in

Skimming tanks

Detritus tanks

Grit chambers

Sedimentation tanks

TRUE ANSWER : ?
YOUR ANSWER : ?

Disinfection efficiency is

Increased at higher pH value of water

Highest at pH value equal to 7

Reduced at higher pH value of water

Unaffected by pH value of water

TRUE ANSWER : ?
YOUR ANSWER : ?

The water carriage system of collection of waste product

All of these

Requires treatment before disposal

Creates hygienic problem

Is cheaper in initial cost than dry conservancy system

TRUE ANSWER : ?
YOUR ANSWER : ?

The most commonly used sewer under culverts is

Horseshoe type sewer

Circular brick sewer

Semi-elliptical sewer

Circular cast iron sewer

TRUE ANSWER : ?
YOUR ANSWER : ?

The design discharge for the separate sewer system shall be taken as

3 × DWF

2 × DWF

6 × DWF

Equal to dry weather flow (DWF)

TRUE ANSWER : ?
YOUR ANSWER : ?

When there is no recirculation of sewage, then recirculation factor is

None of these

1

Infinity

TRUE ANSWER : ?
YOUR ANSWER : ?