Civil engineering Environmental Questions - Set 06 - ObjectiveBooks

Civil engineering Environmental Questions - Set 06

Practice Test: Question Set - 06


1. The hourly variation factor is usually taken as
    (A) 1.5
    (B) 1.8
    (C) 2.0
    (D) 2.7

2. The maximum discharge of a tube well is about
    (A) 5 liters/sec
    (B) 50 liters/sec
    (C) 500 liters/sec
    (D) 1000 liters/sec

3. Turbidity is measured on
    (A) Standard silica scale
    (B) Standard cobalt scale
    (C) Standard platinum scale
    (D) Platinum cobalt scale

4. The overflow rate for plain sedimentation tanks is about
    (A) 500 to 750 liters/hour/ m²
    (B) 1000 to 1250 liters/hour/ m²
    (C) 1250 to 1500 liters/hour/m²
    (D) 1500 to 2000 liters/hour/m²

5. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.
Reason R: The sand used in slow sand filters is finer than that in rapid sand filters
Select your answer based on the coding system given below:
    (A) Both A and R is true and R is the correct explanation of A
    (B) Both A and R is true but R is not the correct explanation of A
    (C) A is true but R is false
    (D) A is false but R is true

6. Which of the following chemical compounds can be used for de-chlorination of water?
    (A) Carbon dioxide
    (B) Bleaching powder
    (C) Sulphur dioxide
    (D) Chloramines

7. Hardy cross method of analysis of distribution system
    (i) Involves successive trials
    (ii) Takes economic aspects into account
    (iii) Is time consuming
    The correct answer is
    (A) Only (i)
    (B) (i) and (ii)
    (C) (i) and (iii)
    (D) All are correct

8. Average rate of water consumption per head per day as per Indian Standard is
    (A) 100 liters
    (B) 135 liters
    (C) 165 liters
    (D) 200 liters

9. The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is
    (A) Equal to HMD when flowing full
    (B) Less than HMD when flowing full
    (C) Greater than HMD when flowing full
    (D) None of the above

10. Select the correct statement.
    (A) 5 day BOD is the ultimate BOD
    (B) 5 day BOD is greater than 4 day BOD keeping other conditions same
    (C) 5 day BOD is less than 4 day BOD keeping other conditions same
    (D) BOD does not depend on time

11. Laying of sewers is usually done with the help of
    (A) A Theodolite
    (B) A compass
    (C) Sight rails and boning rods
    (D) A plane table

12. For normal sludge, the value of sludge index for Indian conditions is
    (A) 0 to 50
    (B) 50 to 150
    (C) 150 to 350
    (D) 350 to 500

13. If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be
    (A) 100000 m3
    (B) 150000 m3
    (C) 180000 m3
    (D) 270000 m3

14. The most common cause of acidity in water is
    (A) Carbon dioxide
    (B) Oxygen
    (C) Hydrogen
    (D) Nitrogen

15. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
    (A) 0.01 to 0.05 ppm
    (B) 0.05 to 0.5 ppm
    (C) 0.5 to 1.0 ppm
    (D) 1.0 to 5.0 ppm

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