Multiple choice

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

  1. Only (a) and (b)

  2. Only (b) and (c)

  3. Only (c) and (d)

  4. Only (b) and (d)

  5. Only (a) and (c)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. Sludge collected is used as manure and also to produce biogas.

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