The flowing river water in natural drainage gets cleaned by

 

(A) photosynthesis

 

(B) self purification

 

(C) oxidation

 

(D) none of these

Temporary hardness of water may be removed by

(A) De-ionization method

(B) Zeoloite process

(C) Lime soda process

(D) Boiling

Winter rainfall in Tamil Nadu is mainly due to

(A) orographic precipitation

(B) precipitation due to turbulent ascent

(C) cyclonic precipitation

(D) convective precipitation

Depletion of ozone layer in the outer atmosphere may causes

(A) heart disorder

(B) bronchitis

(C) skin cancer

(D) lung cancer

In sewers the effect of scouring is more on

(A) horizontal side

(B) top side

(C) bottom side

(D) all sides

A commonly used handpump is

(A) axial flow pump

(B) centrifugal pump

(C) rotary pump

(D) reciprocating pump

Turbidity is measured on

(A) platinum cobalt scale

(B) standard platinum scale

(C) standard cobalt scale

(D) standard silica scale

pH value of water indicates

(A) acidity of alkalinity

(B) turbidity

(C) chloride content

(D) hardness

The distribution mains are designed for

(A) maximum daily demand

(B) maximum hourly demand on maximum day

(C) maximum hourly demand

(D) average daily demand

The controlling design parameter in the design of all setting tanks is

(A) depth

(B) percent removal of suspended solids

(C) overflow rate

(D) detention time

With self cleansing velocity in sewers

(A) silting occurs at bottom

(B) neither silting nor scouring occurs at bottom

(C) both silting and scouring occur at bottom

(D) scouring occurs at bottom