ENVIRONMENTAL ENGINEERING IN CE QUIZ

Pick out the one which is not a chemical coagulant.

Hydrated lime

Ferrous sulphate

Aluminium sulphate

Chloramine

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Bacterial stability factor

Oxygen ion concentration

Biological oxygen demand (BOD)

Relative stability

TRUE ANSWER : ?
YOUR ANSWER : ?

COD of raw municipal sewage may be in the range of about __________ mg/litre.

90-120

1500-2500

1-2

5-10

TRUE ANSWER : ?
YOUR ANSWER : ?

What are the methods of treatment & disposal of radioactive wastes?

All of these

Biological methods & adsorption in ion exchange materials

Fixing into a solid mass with cement and sinking deep in the sea

Evaporation & chemical precipitation

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of high concentration of ozone and smog in atmospheric air causes the

Embrittlement & decrease of folding resistance of paper

Fading of dye on textiles

Cracking of rubber products

Damage of electrical insulator on high tension power line

TRUE ANSWER : ?
YOUR ANSWER : ?

The principal gas evolved from sludge digestion tank is

CO₂

CH₄

CO

N₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following pollutants is not emitted during volcanic eruptions?

CO

H₂S

Hydrocarbons

SO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

H₂S present in gaseous stream can be removed by adsorption on

Limestone powder

Bog iron

Silica gel

Active carbon

TRUE ANSWER : ?
YOUR ANSWER : ?

Ozone is

Impervious to ultra-violet rays

Both B & C

A primary pollutant

A secondary pollutant

TRUE ANSWER : ?
YOUR ANSWER : ?

Presence of excess flourine in water causes

Fluorosis

Tooth decay

Respiratory disease

Dental cavity

TRUE ANSWER : ?
YOUR ANSWER : ?