PSC Civil Engg: Environmental Quiz 3

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Question 1

Match List-I (Treatment method) with List-II (Important design parameter) and select the correct answer using the codes given below the lists:

• A4,- 1,- 3,- 2
• B4,- 3,- 1,- 2
• C1,- 2,- 3,- 4
• D1,- 3,- 2,- 4

Question 2

A combined sewerage system is more appropriate for developed areas where

• ARainfall occurs for a very few days in a year
• BRainfall occurs almost uniformly throughout the year
• CAir temperatures are nearly uniform throughout the year
• DAir temperatures through the year include extremes during certain runs of days

Question 3

The design overflow rate of a sedimentation tank is chosen considering

• AFlow rate through the tank
• BDiameter of the particle intended to be removed
• CVolume of the sedimentation tank
• DDetention time in the tank

Question 4

What is the equivalent calcium carbonate concentration of 110 mg/L of CaCl₂?

• A50 mg/L
• B58.5 mg/L
• C100 mg/L
• D117 mg/L

Question 5

A water supply distribution system for an averagely-populated township is to be designed for

• AMaximum daily demand
• BMaximum hourly demand and fire demand
• CAverage demand
• DMaximum daily demand and fire demand or maximum hourly demand, whichever is higher

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