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UPSC Civil Service Exam Questions

Q1: Which one of the following statements is not correct ?

A Settling and sludge digestion occur in septic tanks in one compartment

B Settling and sludge digestion occur in Imhoff tank in different compartments

C Septic tank is a low-rate anaerobic unit whereas an Imhoff tank is a high rate anaerobic unit

D The rate of sludge accumulation in septic tank is approximately 40-70 litres/capita/year

ANS:C - Septic tank is a low-rate anaerobic unit whereas an Imhoff tank is a high rate anaerobic unit

Sludge accumulation for a septic tank is 30 litre per person per year option D is incorrect.



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