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Focused topic practice

environmental engineering MCQs

Practise focused environmental engineering questions with marked answers for exam preparation and subject revision.

environmental engineering Mcqs
1. Average rate of water consumption perhead per day as per Indian Standard is______________?
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A. 200 litres

B. 135 litres

C. 100 litres

D. 165 litres

2. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________?
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A. main sewer

B. house sewer

C. submain sewer

D. lateral sewer

3. Cleaning is done by________________?
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A. back washing in slow sand filters

B. correct answer is

C. scraping and removal in filters rapid sand

D. back washing in rapid sand filters</strong>

E. scraping and removal in filters slow sand
4. The rate of BOD exerted at any time is_____________?
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A. directly proportional to BOD satisfied

B. inversely proportional to BOD re-maining

C. directly proportional to BOD remain-ing

D. inversely proportional to BOD satisfied

5. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
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A. partially separate system

B. combined system

C. separate system

D. partially combined system

6. The suitable layout of distribution system for a city with roads of rectangular pattern is______________?
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A. ring system

B. dead end system

C. radial system

D. grid iron system
7. The percentage of chlorine in fresh bleaching powder is about________________?
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A. 30 to 35

B. 40 to 50

C. 10 to 15

D. 20 to 25

8. The suitable method of forecasting population for a young and rapidly increasing city is_________________?
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A. arithmetical increase method

B. incremental increase method

C. geometrical increase method

D. graphical method

9. The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?
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A. circle method

B. electrical analysis method

C. equivalent pipe method

D. Hardy cross method

10. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?
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A. pressure relief valve

B. reflux valve

C. air relief valve

D. sluice valve

11. Select the correct statement?
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A. 5 day BOD is greater than 4 day BOD keeping other conditions same

B. 5 day BOD is the ultimate BOD

C. BOD does nof depend on time

D. 5 day BOD is less than 4 day BOD keeping other conditions same
12. If the average daily consumption of a city is 100,000 m3, the maximum daily consumption on peak hourly demand will be_______________?
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A. 270000 m3

B. 150000m3

C. 180000m3

D. 100000m3

13. The velocity of flow of water in a sedimentation tank is about__________________?
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A. 15 to 30 cm/minute

B. 15 to 30 cm/sec.

C. 15 to 30 cm/hour

D. 5 to 10 cm/sec.

14. The polluted water is one which_______________?
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A. contains pathogenic bacteria

B. consists of undesirable substances rendering it unfit for drinking and domestic use

C. is contaminated

D. is safe and suitable for drinking and domestic use

15. The settling velocity of a particle in a sedimentation tank increases if_________________?
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A. the depth of tank is decreased

B. particle size is decreased

C. none of the above

D. the surface area of tank is increased

16. When there is no recirculation of sewage, then recirculation factor is_______________?
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A. 0

B. 1

C. infinity

D. none of the above

17. Which of the following retards the self purification of stream ?
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A. higher temperature

B. sunlight

C. none of the above

D. satisfying oxygen demand

18. The amount of coagulant needed for coagulation of water increases with_______________?
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A. correct answer is?

B. decrease in turbidity of water

C. increase in turbidity of water

D. decrease in temperature of water</strong>

E. increase in temperature of water

19. As compared to rapid sand filters, slow sand filters give______________?
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A. slower filtration rate

B. lesser efficiency in removal of bacteria

C. higher efficiency in removal of bacteria </strong>

D. higher filtration rate

E. correct answer is?

20. The major disadvantage of lime soda process of water softening is that_________________?
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A. huge amount of precipitate is formed which creates a disposal problem

B. the effluent cannot be reduced to zero hardness

C. it is unsuitable for turbid and acidic water

D. it is unsuitable for softening the water of excessive hardness