Question

7. Waste water containing human excreta is known as -

a. Sewage b. Sewer

c. Sewerage d. None of these

8. The impurities present in waste water are called –

a. Sewage b. Manure

c. Contaminants d. None of these

9. Underground sewage pipes are provided with –

a. Sewer b. Tunnel

c. Manholes d. None of these

10. Scum is removed with –

a. Bar screen b. Chemical reaction

c. Skimmer d. None of these​

Answer 1

Answer:

7. a.

8. c.

9. b.

10. a.

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Answer 2

Answer:

7) a. sewage

8) c. contaminants

9) c. manholes

10) c. skimmer