Q$1.$ Choose the right answer $(25$ marks$)$

Wastewater is a liquid waste generated from various activities such as :

a$.$ Residential

b$.$ Industrial

c$.$ Commercial and public area

d$.$ All of the above

The design capacity of water treatment plants is based on the:

a$.$ maximum hourly demand.

b$.$ maximum daily demand.

c$.$ average daily demand.

Ozonation is a one type of:

a$.$ ion exchange process

b$.$ disinfection

c$.$ boiling

d$.$ biological treatment

Temporary or carbonate hardness caused by:

a$.HC{O}_3$

b$.S{O}_4$

c$.N{a}_{2}C{O}_3$

Network of sewers used for the purpose transporting of sewage is called

a$.$ Sewerage

b$.$ Sewer

c$.$ Drainage

d$.$ Manhole

The opening of fine screen was:

a$.$ Opening $<mn>6</mn><mi>m</mi><mi>m</mi>$

b$.$ Opening $>25mm$

c$.6mm$ Opening $<mn>2</mn><mn>5</mn><mi>m</mi><mi>m</mi>$

d$.$ None of these

water consumption can be affecting by :

a$.$ climate condition

b$.$ size of city

c$.$ metering

d$.$ all of these

e$.$ None of these

Areation, adding chemicals or using activated carbon are a process may be used for

a$.$ super chlorination

b$.$ Post chlorination

c$.$ Prechlorination

d$.$ none of them