MCQ Questions Civil Engineering Environmental Engineering
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MCQ Questions Civil Engineering Environmental Engineering - Set - 5
Question 1:
As compared to rapid sand filters, slow sand filters give
i) slower filtration rate
ii) higher filtration rate
iii) lesser efficiency in removal of bacteria
iv) higher efficiency in removal of bacteria
The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (i) and (iv)
d) (ii) and (iv)
Correct Answer – (C)
Question 2 :
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
Correct Answer – (A)
Question 3 :
The chemical most commonly used to increase speed of sedimentation of sewage is
a) sulphuric acid
b) copper sulphate
c) lime
d) sodium permanganate
Correct Answer – (C)
Question 4 :
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
Correct Answer – (C)
Question 5 :
The amount of coagulant needed for coagulation of water increases with
i) increase in turbidity of water
ii) decrease in turbidity of water
iii) increase in temperature of water
iv) decrease in temperature of water
The correct answer is
a) (i) and (ii)
b) (i)and(iv)
c) (ii) and (iii)
d) (ii) and (iv)
Correct Answer – (B)
MCQ Questions Civil Engineering Environmental Engineering
Question 6:
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
Correct Answer – (A)
Question 7:
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
Correct Answer – (D)
Question 8:
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
Correct Answer – (D)
Question 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
Correct Answer – (C)
Question 10:
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
Correct Answer – (C)
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