ENVIRONMENTAL ENGINEERING IN CE QUIZ

Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

Neither A nor B

Both A & B

Photosynthetic action of algae

Natural aeration of water stream

TRUE ANSWER : ?
YOUR ANSWER : ?

The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Boundary layer separation

Fluctuation in liquid flow

Pipe vibrations

Cavitation

TRUE ANSWER : ?
YOUR ANSWER : ?

The biological decomposition of organic substances in wastes controlled conditions is called

Biological oxidation

Incineration

None of these

Composting

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Silica gel

Active carbon

Pulverised limestone

Bog iron (iron oxide)

TRUE ANSWER : ?
YOUR ANSWER : ?

Biological oxidation ponds remove organic matters present in the polluted water by

Aerobic oxidation

Neither A nor B

Both A & B

Using the activities of bacteria and other micro organisms

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

Depletion of dissolved oxygen

Persistent foam

Explosion hazards

Fire hazards

TRUE ANSWER : ?
YOUR ANSWER : ?

Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Nitrogen dioxide

Hydrocarbons

Hydrogen sulphides

Hydrogen flouride

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of __________ in water stream are deleterious to aquatic life.

Soluble and toxic organics

All of these

Suspended solids

Heavy metals and cynides

TRUE ANSWER : ?
YOUR ANSWER : ?

5-200 μm size particles are called

Colloids or aerosols

Powder

Smoke

Dust

TRUE ANSWER : ?
YOUR ANSWER : ?

The progressive warming up of the earth's surface is mainly due to the

Thickening of ozone layer

De-forestation

Automobile exhaust

Blanketing effect of CO₂ in the atmosphere

TRUE ANSWER : ?
YOUR ANSWER : ?

↑