What does the oil and fat thrown in the drain do?

The wastewater treatment involves physical, chemical and biological processes. Which of the following impurities is/are not removed by the physical process?

Why are eucalyptus trees planted around a sewage pond?

(a) They absorb the surplus waste water. (b) They neutralise the foul smell. (c) They hide the dirty pond. (d) They release good amount of pure water vapour.

Which of the following types of sewage originates mainly from our kitchen?

Poor people defecate in the open, near river beds causing water pollution. Which of the following water borne diseases can be caused, as water gets polluted?

Which of the following organisms are used to treat the human excreta in the vermi-processing toilets?

One of the types of sewage disposal is septic tanks. Where can it be used?

After physical process, some solid impurities like faeces present in the waste are removed by a scrapper and is known as sludge. The sludge, thus collected is

(a) thrown away (b) used as manure (c) used to produce biogas (d) used as construction material

Which of the following is the correct way to contribute in maintaining the sanitation at public places?

At the junction of sewers, when direction is changed, ________ are made.

Water, which is said to be waste water, can be saved by which of the following methods?

Which of the following impurities in the sewage is/are not organic in nature?

Which of the following chemical elements helps in cleaning the contaminated water making it fit for drinking?

Which of the following represents the transport system of waste water, which is made up of big and small pipes?

The bacteria present in the sewage cause which of the following diseases?

(a) Cholera (b) Jaundice (c) Dysentery (d) Typhoid (e) Diarrhea