028/2020

10.

11.

12.

13.

14.

15.

16.

17.

It indicate the loss of water penetrated into the soil it may join some underground
water

A) Transpiration B) Surface runoff
C) Percolation D) Infiltration

For potable water, the amount of chloride should not exceed

A) 225 ppm B) 275 ppm C) 150 ppm D) 250 ppm

The theoretical time taken by a particle of water to pass between entry and exit of a
setting tank is known as
A) Detention period B) Settling period
C) Period of penetration D) Falling period

The valve is an automatic device which allows water to go one direction only
A) Relief valve B) Sluice valve
C) Scour valve D) Reflex valve

The term used to indicate the waste water from bathroom, kitchen etc.
A) Night-soil B) Raw sewage
C) Sullage D) Septic sewage

It is constructed to provide a connection between the high level branch sewers to
low level main sewer with a minimum amount of disturbances

A) Drop Manhole B) Manhole C) Catch Basin D) Inlet
Amount of oxygen required to carrying out the biological decomposition of dissolved
solids in sewage under aerobic condition at standard condition
A) Dissolved oxygen
B) Chemical oxygen demand
C) Biochemical oxygen demand
)

D) Oxygen demand

The term is used to indicate the sludge which is obtained by settling sewage in
presence of abundant oxygen

A) Activated Sludge B) Aeration

C) Diffusers D) Mechanical Aeration