Question 1

A treatment system suitable for small and medium sized towns and cities is

Accepted Answer

Trickling filter

Answer

Aerated lagoon

Answer

Activated sludge process

Answer

Oxidation pond

Question 2

Highest BOD removal efficiency is achieved in

Accepted Answer

Oxidation ditch

Answer

Trickling filter

Answer

Oxidation pond

Answer

Aerated lagoon

Question 3

Putrefaction is a process of

Accepted Answer

Anerobic decomposition

Answer

Aerobic decomposition

Answer

Facultative decomposition

Answer

Intermitttent decomposition

Question 4

As a result of stabilisation of sewage effluent themost appropriate endproduct produced is

Accepted Answer

Plant nitrate

Answer

Alkalinity

Answer

Hardness

Answer

Chloride

Question 5

Chemical oxygen demand is

Accepted Answer

Oxygen required to oxidise biologically active organic matter

Answer

Oxygen required to oxidise both biologically active and inactive inorganic matter

Answer

Oxygen required to oxidise biologically inactive organic matter

Answer

Oxygen required to oxidise both biologically active and inactive organic matter

Question 6

A single rapid test to determine the pollution status of a river

Accepted Answer

DO

Answer

Chloride

Answer

Total solids

Answer

Nitrate

Question 7

For a continuos flow type sedimentation tanks

Accepted Answer

All of these

Answer

Width of tank is kept about 6m

Answer

Length of tank is kept 4-5 times width

Answer

Maximum horizontal flow velocity is kept about 0.3m/min

Question 8

No treatment of sewage is needed if dilutuon factor is

Accepted Answer

More than 500

Answer

Between 150 to 300

Answer

Less than 150

Answer

Between 150 to 250

Question 9

A sewer that unloads the sewage to point of treatment is called

Accepted Answer

Outfall sewer

Answer

Lateral sewer

Answer

Trunk sewer

Answer

House sewer

Question 10

Sludge does not contain waste water from

Accepted Answer

Toilet

Answer

Wash basin

Answer

Bathroom

Answer

Kitchen

Related quizzes

Related quizzes