All Questions page - 351

The suitable method for disinfection of swimming pool water is

(A) chlorination

(B) by using potassium permanganate

(C) ultra violet rays treatment

(D) lime treatment

Which one of the following would contain water with the maximum amount of turbidity?

(A) wells

(B) rivers

(C) oceans

(D) lakes

The rainfall at any place may be determined by

(A) its intensity

(B) its frequency

(C) its direction

(D) all the above

A garden developed over top of surface water tank is known as

(A) water tank garden

(B) hanging garden

(C) municipal garden

(D) none of these

Temporary hardness in water is caused by the presence of

(A) chlorides of Ca and Mg

(B) bicarbonate of Ca and Mg

(C) sulphates of Ca and Mg

(D) nitrates of Ca and Mg

Bacteria that need oxygen to live are known as

(A) pathogenic bacteria

(B) facultative bacteria

(C) anaerobic bacteria

(D) aerobic bacteria

Suspended impurities in water is

(A) algae

(B) bacteria

(C) silts

(D) all of these

A timber dam is a

(A) detention dam

(B) rigid dam

(C) non-rigid dam

(D) non-overflow dam

Stone ware pipes are

(A) specially suited to pressure pipes

(B) hydraulically efficient because of their smooth interior surface

(C) highly impervious

(D) highly resistant to sulphide corrosion

Process of killing pathogenic bacteria from water is known as

(A) sedimentation

(B) disinfection

(C) coagulation

(D) filtration

Bacteria that survive in the absence of oxygen are known as

(A) anaerobic bacteria

(B) aerobic bacteria

(C) facultative bacteria

(D) pathogenic bacteria

A pipe sunk into the well to tap underground water is called

(A) artesian well

(B) open well

(C) infiltration well

(D) tube well

Dry water flow in a combined sewer, is

(A) storm water

(B) inclusive of domestic and industrial sewage but excludes storm water

(C) industrial sewage

(D) domestic sewage

Aerosol is

(A) diffused liquid particles

(B) carbon particles of microscopic size

(C) dispersion of small solid or liquid particles in gaseous media

(D) finely divided particles of ash

All major and important gravity dams are nowadays constructed with

(A) concrete

(B) earth and rock fill

(C) brick masonry

(D) stone masonry

A circular sewer section is preferred to because

(A) it provides maximum hydraulic mea depth

(B) it provides maximum area for a given perimeter

(C) it is cheaper in construction

(D) all the above

Cowl is provided at

(A) first step in manhole

(B) upper end of the manhole

(C) lower end of ventilating column

(D) upper end of ventilating column

The flowing river water in natural drainage gets cleaned by

(A) photosynthesis

(B) self purification

(C) oxidation

(D) none of these