Match list – I  with List – II and select the correct answer using the codes given below the lists:

List – I

(Treatment units)

List – II

(Detention time)

  1. Grit chamber
  1. Six hours
  1. Primary sedimentation
  1. Two minutes
  1. Activated sludge
  1. Two hours
  1. Sludge digestion
  1. Twenty five days

1
(a) - 3, (b) - 1, (c) - 4, (d) – 2
2
(a) - 2, (b) - 3, (c) - 1, (d) – 4
3
(a) - 2, (b) - 1, (c) - 3, (d) – 4
4
(a) - 1, (b) - 2, (c) - 3, (d) – 4

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