Multiple choice

Determine the correctness or otherwise of the following Assertion [a] and Reason [r] Assertion: The crown of the outgoing larger diameter sewer is always matched with the crown of incoming smaller diameter sewer. Reason: It eliminates backing up of sewage in the incoming smaller diameter sewer.

  1. Both [a] and [r] are true and [r] is the correct reason for [a].

  2. Both [a] and [r] are true but [r] is not the correct reason for [a].

  3. Both [a] and [r] are false.

  4. [a] is true but [r] is false.
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A Correct answer
Explanation

Matching the crown of sewers is standard practice to ensure that the hydraulic gradient line remains continuous and to prevent backwater effects in the upstream pipe.

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