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The _______ are used for preventing foul gas from sewers to back flow in the house.

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The _______ are used for preventing foul gas from sewers to back flow in the house.

(a) air freshners

(b) traps

(c) naphthalene balls

(d) phenyl

I got this question in an online quiz.

The origin of the question is Water Supply Works in portion Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

1 Answer

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Best answer
The correct answer is (b) traps

Explanation: In plumbing, a trap is a device which has a shape that uses a bending path to capture water to prevent sewer gases from entering buildings, while allowing waste to pass through. In refinery applications, traps are used to prevent hydrocarbons and other dangerous gases from escaping outside through drains.

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