ENVIRONMENTAL ENGINEERING QUIZ

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

None of these

Decreases

Increases

Remains unaffected

TRUE ANSWER : ?
YOUR ANSWER : ?

The biochemical treatment of sewage effluents is essentially a process of

Alkalinization

Oxidation

Reduction

Dehydration

TRUE ANSWER : ?
YOUR ANSWER : ?

The water carriage system of collection of waste product

All of these

Requires treatment before disposal

Is cheaper in initial cost than dry conservancy system

Creates hygienic problem

TRUE ANSWER : ?
YOUR ANSWER : ?

As compared to cast iron pipes, steel pipes are

Costlier

Less susceptible to corrosion

Heavier

Stronger

TRUE ANSWER : ?
YOUR ANSWER : ?

The major disadvantage of lime soda process of water softening is that

It is unsuitable for turbid and acidic water

The effluent cannot be reduced to zero hardness

It is unsuitable for softening the water of excessive hardness

Huge amount of precipitate is formed which creates a disposal problem

TRUE ANSWER : ?
YOUR ANSWER : ?

The pathogens can be killed by

Oxidation

Nitrification

None of these

Chlorination

TRUE ANSWER : ?
YOUR ANSWER : ?

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

None of these

Less than HMD when flowing full

Equal to HMD when flowing full

Greater than HMD when flowing full

TRUE ANSWER : ?
YOUR ANSWER : ?

The maximum permissible limit for fluoride in drinking water is

5 mg/liter

1.5 mg/liter

0.1 mg/liter

10 mg/liter

TRUE ANSWER : ?
YOUR ANSWER : ?

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

75

100

50

59

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following unit works in anaerobic conditions?

Sedimentation tank

Activated sludge treatment

Sludge digestion tank

Trickling filters

TRUE ANSWER : ?
YOUR ANSWER : ?