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Free download in PDF Environmental Engineering MCQS and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams as well as Board exams. These short solved questions or quizzes are provided by Gkseries.
101
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
Answer: None Of The Above
102
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
103
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
Answer: decreases pH value of water
104
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
Answer: bacteria and colloidal solids
105
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
106
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 are true and R is the correct explanation of A
[B]
Both A and R are 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
Answer: Both A and R are true and R is the correct explanation of A
107
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
Answer: excessive negative head
108
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
[A]
0.2 to 0.4
[B]
0.4 to 1.0
[C]
2 to 4
[D]
5 to 7
109
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
Answer: greater than that of rapid sand filters
110
The process in which the chlorination is done beyond the break point is known as
[A]
Prechlorination
[B]
Post Chlorination
[C]
Super Chlorination
[D]
Break Point Chlorination
Answer: Super Chlorination
111
The treatment of water with bleaching powder is known as
[A]
prechlorination
[B]
super chlorination
[C]
dechlorination
[D]
hypochlorination
112
The suitable method for disinfection of swimming pool water is
[A]
ultra violet rays treatment
[B]
lime treatment
[C]
by using potassium permanganate
[D]
chlorination
Answer: ultra violet rays treatment
113
Which of the following chemical compounds can be used for dechlorination of water ?
[A]
Carbon Dioxide
[B]
Bleaching Powder
[C]
Sulphur Dioxide
[D]
Chloramines
114
In lime-soda process
[A]
only carbonate hardness is removed
[B]
only non-carbonate hardness is re-moved
[C]
lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
[D]
lime reduces the non-carbonate hard-ness and soda-ash removes the carbo¬nate hardness
Answer: lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
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