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Civil Engineering Quiz | Practice MCQ #mcq.imBooz

December 12, 2019 by Dr. IM Leave a Comment

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1 >>If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to ?

  • (A) total alkalinity
  • (B) total hardness
  • (C) total hardness total alkalinity
  • (D) non carbonate hardness

2 >>The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about ?

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  • (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

3 >>The length of rectangular sedimentation tank should not be more than ?

  • (A) B
  • (B) 2B
  • (C) 4B
  • (D) 8B

4 >>Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about ?

  • (A) 10 to 25
  • (B) 50
  • (C) 75
  • (D) 100

5 >>The settling velocity of a particle in a sedimentation tank depends on ?

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  • (A) depth of tank
  • (B) surface area of tank
  • (C) both depth and surface area of tank
  • (D) none of the above

6 >>The settling velocity of a particle in a sedimentation tank increases if ?

  • (A) particle size is decreased
  • (B) the surface area of tank is increased
  • (C) the depth of tank is decreased
  • (D) none of the above

7 >>For a given discharge, the efficiency of sedimentation tank can be increased by ?

  • (A) increasing the depth of tank
  • (B) decreasing the depth of tank
  • (C) increasing the surface area of tank
  • (D) decreasing the surface area of tank

8 >>The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally ?

  • (A) less and more
  • (B) less and less
  • (C) more and less
  • (D) more and more

9 >>Alum as a coagulant is found to be most effective when pH range of water is ?

  • (A) 2 to 4
  • (B) 4 to 6
  • (C) 6 to 8
  • (D) 8 to 10

10 >>The detention period in coagulation tanks is usually kept as ?

  • (A) 1 to 2 minutes
  • (B) 30 to 45 minutes
  • (C) 2 to 6 hours
  • (D) 2 to 6 days

11 >>The alum, when added as a coagulant in water ?

  • (A) does not require alkalinity in water for flocculation
  • (B) does not affect pH value of water
  • (C) increases pH value of water
  • (D) decreases pH value of water

12 >>The chemical most commonly used to increase speed of sedimentation of sewage is ?

  • (A) sulphuric acid
  • (B) copper sulphate
  • (C) lime
  • (D) sodium permanganate

13 >>In water treatment, rapid gravity filters are adopted to remove ?

  • (A) dissolved organic substances
  • (B) dissolved solids and dissolved gases
  • (C) floating solids and dissolved inorganic solids
  • (D) bacteria and colloidal solids

14 >>The rate of filtration in slow sand filters in million litres per day per hectare is about ?

  • (A) 50 to 60
  • (B) 100 to 150
  • (C) 500 to 600
  • (D) 1400 to 1500

15 >>The effective size of sand particles used in slow sand filters is ?

  • (A) 0.25 to 0.35 mm
  • (B) 0.35 to 0.60 mm
  • (C) 0.60 to 1.00 mm
  • (D) 1.00 to 1.80 mm

16 >>Air binding phenomena in rapid sand filters occur due to ?

  • (A) excessive negative head
  • (B) mud ball formation
  • (C) higher turbidity in the effluent
  • (D) low temperature

17 >>Period of cleaning of slow sand filters is about ?

  • (A) 24 48 hours
  • (B) 1012 days
  • (C) 23 months
  • (D) 12 year

18 >>The rate of Alteration of pressure filters is ?

  • (A) less than that of slow sand filters
  • (B) in between the filtration rate of slow sand filters and rapid sand filters
  • (C) greater than that of rapid sand filters
  • (D) equal to that of slow sand filters

19 >>Double filtration is used ?

  • (A) to increase the filtration slow sand filters capacity of
  • (B) to increase the filtration rapid sand filters capacity of
  • (C) for isolated buildings like pools, hotels etc swimming
  • (D) all of the above

20 >>Disinfection of water results in ?

  • (A) removal of turbidity
  • (B) removal of hardness
  • (C) killing of disease bacteria
  • (D) complete sterilization

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