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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 ?

  • (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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Filed Under: Competitive Exam Quiz Tagged With: ae, Basic Civil Engineering Quiz, Civil Engineering Questions and Answers, Civil Engineering questions MCQs with answers, Civil Engineering Quiz, cpwd, dda, gate, ies, Multiple Choice Questions on Civil Engineering, previous years civil engineering questions, pwd, ssc

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