All Questions page - 352

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

Permanent hardness of water can be removed by

(A) adding alum

(B) adding chlorine

(C) boiling

(D) lime soda process

Which one of the following causes cumulative poisoning by water?

(A) lead

(B) iron

(C) barium

(D) manganese

Meyer's and Rohwer's formula are used to determine.

(A) evaporation

(B) average rainfall over a basin

(C) transpiration

(D) precipitation

Colorimetric method of testing water is to determine

(A) turbidity

(B) hardness

(C) chlorides

(D) pH value

The most common and universal coagulant used in water works is

(A) magnesium sulphate

(B) calcium sulphate

(C) chlorine

(D) aluminium sulphate

Rainwater of the locality which flows in sewer is called

(A) subsoil water

(B) storm water

(C) combined sewage

(D) sullage

Which one of the following is not surface water?

(A) from natural spring

(B) from natural lakes

(C) from reservoir storage

(D) from river diversion

A dam constructed to store water during floods and release is gradually later is known as

(A) rigid dam

(B) detention dam

(C) diversion dam

(D) storage dam