Q.

Which of the following things are included in domestic sewage? 

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a

Washing powders

b

Both (1) and (3).

c

Discarded medicines

d

Vegetable waste 

answer is D.

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Detailed Solution

Domestic sewage is the wastewater which is discarded from households. Also known as sanitary sewage, such water contains a wide variety of dissolved and suspended impurities. It contains food, vegetables and fruit waste, washing powders, chemical soaps, etc.  Domestic sewage may also contain disease-causing microbes. 

Discarded medicines are included in biomedical waste. So it is an incorrect option. 

Therefore, the correct answer is option (4).

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