Match List-I (Parameter) with List-II (Type of Characteristic) and select the correct code:

Question

Match List-I (Parameter) with List-II (Type of Characteristic) and select the correct code:

List-I

i. Turbidity

ii. BOD

iii. Total coliforms

iv. COD

List-II

a. Total organic matter

b. Faecal contamination

c. Suspended solids

d. Biodegradable organics

Choose the correct match:

1. A. i-c, ii-d, iii-b, iv-a (Correct answer)
2. B. i-d, ii-c, iii-b, iv-a
3. C. i-c, ii-a, iii-d, iv-b
4. D. i-b, ii-d, iii-c, iv-a

Correct Answer

Option A — i-c, ii-d, iii-b, iv-a

Detailed Solution & Explanation

The correct answer is i-c, ii-d, iii-b, iv-a.

Key Points

• Each parameter answers one question about the sample:
  • i. Turbidity - c. Suspended solids. Cloudiness caused by particles scattering light.
  • ii. BOD - d. Biodegradable organics. Oxygen consumed by micro-organisms, so only the digestible fraction.
  • iii. Total coliforms - b. Faecal contamination. The indicator of possible sewage pollution.
  • iv. COD - a. Total organic matter. Chemical oxidation reaches both biodegradable and refractory material.

Additional Information

• The pairing that decides this question is BOD against COD. Both measure organic matter, but BOD measures only the biodegradable share while COD measures effectively all of it — so "total organic matter" must go to COD and "biodegradable organics" to BOD.
• Getting that pair right eliminates every other option, which is the efficient route through a match item of this kind.
• Turbidity and suspended solids are related but not identical: turbidity is optical (NTU), suspended solids is gravimetric (mg/L). The correlation between them is site-specific and must be established locally.
• Total coliforms include environmental organisms found in soil and vegetation; faecal coliforms and particularly E. coli are the more specific indicators of recent contamination.