Important Paper ESE Civil Engnineering

Q1. A water supply distribution system for an averagely-populated township is to be designed for

1. Maximum daily demand
2. Maximum hourly demand and fire demand
3. Average demand
4. Maximum daily demand and fire demand or maximum hourly demand, whichever is higher

Answer: D

Q2. A combined sewerage system is more appropriate for developed areas where

1. Rainfall occurs for a very few days in a year
2. Rainfall occurs almost uniformly throughout the year
3. Air temperatures are nearly uniform throughout the year
4. Air temperatures through the year include extremes during certain runs of days

Answer: B

Q3. 100 m3 of sludge holds a moisture content of 95%.If its moisture content chagnes to 90%, the volume of this sludge will then be

1. 40.5m3
2. 50m3
3. 75m3
4. 94.7m3

Answer: B

Q4. The design overflow rate of a sedimentation tank is chosen considering

1. Flow rate through the tank
2. Diameter of the particle intended to be removed
3. Volume of the sedimentation tank
4. Detention time in the tank

Answer: B

Q5. A drain carrying 5m3/s of wastewater with its BOD of 100mg/l joins a stream carrying 50 m3/ s flow with its BOD of 5mg/l. What will be the value of the BOD of the combined flow after complete mixing?

1. 3.6 mg/l
2. 13.6 mg/l
3. 33.6 mg/l
4. 53.6 mg/l

Answer: B

Q6. The side of a square land was measured as 150 m and is in error by 0.05 m. What is the corresponding error in the computed area of the land.

1. 5 m2
2. 10 m2
3. 15 m2
4. 20 m2

Answer: C

Q7. The waste water of a certain large colony contains 10–5.6 mmol/l of OH– ions at 25ºC. The pH of this sample is

1. 8.6
2. 7.9
3. 5.4
4. 4.5

Answer: C

Q4. High concentration of SO2 in atmosphere. Which of the above features are correct?

1. 1, 2 and 4 only
2. 3 and 4 only
3. 1, 2 and 3 only
4. 1, 2, 3 and 4

Answer: C

Q10. For a hydraulically efficient rectangular channel of bed width 5m, the hydraulic radius is

1. 0.5m
2. 1.25m
3. 2.75m
4. 4.25m

Answer: B