ENVIRONMENTAL ENGINEERING QUIZ

Disinfection of water results in

Complete sterilisation

Removal of turbidity

Killing of disease bacteria

Removal of hardness

TRUE ANSWER : ?
YOUR ANSWER : ?

The most common cause of acidity in water is

Carbon dioxide

Hydrogen

Nitrogen

Oxygen

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following causes a decrease in per capita consumption?

Use of metering system

Good quality of water

Better standard of living of the people

Hotter climate

TRUE ANSWER : ?
YOUR ANSWER : ?

The self cleansing velocity for all sewers in India is usually

1.0 m/sec to 1.2 m/sec

Less than 1.0 m/sec

3.0 m/sec to 3.5 m/sec

1.5 m/sec to 2.0 m/sec

TRUE ANSWER : ?
YOUR ANSWER : ?

The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

Less than HMD when flowing full

Greater than HMD when flowing full

None of these

Equal to HMD when flowing full

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a water borne disease?

Typhoid

Malaria

Cholera

Dysentery

TRUE ANSWER : ?
YOUR ANSWER : ?

The most commonly used sewer under culverts is

Horseshoe type sewer

Circular brick sewer

Circular cast iron sewer

Semi-elliptical sewer

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum discharge of a tube well is about

50 liters/sec

5 liters/sec

500 liters/sec

1000 liters/sec

TRUE ANSWER : ?
YOUR ANSWER : ?

The main disadvantage of oxidation pond is that

Large area is required for construction

Maintenance and operation cost are high

None of these

BOD removal is very low

TRUE ANSWER : ?
YOUR ANSWER : ?

Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filters The correct answer is

(i) and (ii)

(ii) and (iv)

(i) and (iv)

(ii) and (iii)

TRUE ANSWER : ?
YOUR ANSWER : ?

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