Environmental Engineering MCQs | Environmental Engineering MCQS and Answers for competitive exams | set 6

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Questions
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

Answer: 2 to 6 hours
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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

Environmental Pollution – Multiple Choice Questions with Answers | EBook

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

Answer: 50 to 60
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

Answer: 2 to 4
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

Answer: 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

Answer: Sulphur Dioxide
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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