ENVIRONMENTAL ENGINEERING IN CE QUIZ

If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.

1000

500

50

3000 (i.e. 0.3%)

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of excess flourine in water causes

Tooth decay

Respiratory disease

Dental cavity

Fluorosis

TRUE ANSWER : ?
YOUR ANSWER : ?

A shallow pond in which the sewage is retained and biologically treated is called

Oxidation

Skimming tank

Lagoon

Imhoff tank

TRUE ANSWER : ?
YOUR ANSWER : ?

Beyond what concentration of H₂S in air, acute danger to human life exists?

700 ppm

300 ppm

50 ppm

100 ppm

TRUE ANSWER : ?
YOUR ANSWER : ?

Scale formation in boiler is controlled by

Reduction in hardness, silica & alumina in feed water

Keeping the pH value of feed water just below 7

Eliminating H₂S in feed water

Preheating of feed water

TRUE ANSWER : ?
YOUR ANSWER : ?

A standard test for determination of hardness in water is termed as __________ test.

EDTA

Total count

Electometric

Presumptive

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is the most widely used coagulant for the treatment of turbid water?

Sodium aluminate

Ferric chloride

Lime

Alum (aluminium sulphate)

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Mechanical flocculation

Sedimentation tank

Circular clarifier

Chemical coagulation

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ is removed from water by lime-soda process.

Iron and manganese

Temporary hardness

Foul smell and taste

Permanent hardness

TRUE ANSWER : ?
YOUR ANSWER : ?

Photochemical smog is formed from automobile exhaust

Appears only on sunny days

By reaction of hydrocarbon & nitric oxide in presence of sunlight

All of these

Is harmful for crops and trees also besides causing eye irritation & asthma

TRUE ANSWER : ?
YOUR ANSWER : ?