Environmental Engineering MCQ Civil Engineering

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About Environmental Engineering

Environment Engineering: How to Protect Our Planet

There is no doubt that environmental engineering is one of the most important disciplines when it comes to protecting our planet. By implementing the right strategies, we can prevent further damage to our environment and ensure a sustainable future for generations to come.

As environment engineers, we have a responsibility to design systems and processes that minimize the impact on our environment. We need to find ways to use less energy and resources, while still meeting the needs of our growing population. This is no easy task, but it is one that we must all work together to achieve.

There are many different ways to protect our environment, and it is up to us to find the best way to do so. We need to be innovative and creative in our approach, and we need to work together as a team. environment engineering is a complex field, but it is one that is vital to the future of our planet. If you want to learn more about environmental engineering and how you can help protect our planet, there are plenty of resources available online. You can also contact a local environment engineer to discuss the issue further. Together, we can make a difference.

Following are some of the multiple choice questions on the Environmental Engineering with answers that will help the students in developing their knowledge.

Environmental Engineering MCQ

1. Activated carbon is used for

  • Disinfection
  • Removing hardness
  • Removing odours
  • Removing corrosiveness

2. The polluted water is one which

  • Contains pathogenic bacteria
  • Consists of undesirable substances rendering it unfit for drinking and domestic use
  • Is safe and suitable for drinking and domestic use
  • Is contaminated

3. Sludge volume index is defined as the ratio of

  • Percentage of sludge by volume to percentage of suspended solids by weight
  • Percentage of sludge by volume to percentage of total solids by weight
  • Percentage of suspended solids by weight to percentage of sludge by volume
  • Percentage of total solids by weight to percentage of sludge by volume

4. The maximum permissible limit for fluoride in drinking water is

  • 0.1 mg/liter
  • 1.5 mg/liter
  • 5 mg/liter
  • 10 mg/liter

5. As compared to shallow wells, deep wells have

  • More depth
  • Less depth
  • More discharge
  • Less discharge

6. 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

  • (i) and (ii)
  • (ii) and (iii)
  • (i) and (iv)
  • (ii) and (iv)

7. As compared to cast iron pipes, steel pipes are

  • Heavier
  • Stronger
  • Costlier
  • Less susceptible to corrosion

8. The water carriage system of collection of waste product

  • Is cheaper in initial cost than dry conservancy system
  • Requires treatment before disposal
  • Creates hygienic problem
  • All of the above

9. Sewage treatment units are designed for

  • Maximum flow only
  • Minimum flow only
  • Average flow only
  • Maximum and minimum flow

10. Facultative bacteria are able to work in

  • Presence of oxygen only
  • Absence of oxygen only
  • Presence as well as in absence of oxygen
  • Presence of water

11. An egg shaped section of sewer

  • Is economical than circular section
  • Provides self cleansing velocity at low discharges
  • Is more stable than circular section
  • Is easy to construct

12. The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

  • B
  • 2B
  • 4B
  • 8B

13. The self cleansing velocity for all sewers in India is usually

  • Less than 1.0 m/sec
  • 1.0 m/sec to 1.2 m/sec
  • 1.5 m/sec to 2.0 m/sec
  • 3.0 m/sec to 3.5 m/sec

14. In water treatment, rapid gravity filters are adopted to remove

  • Dissolved organic substances
  • Dissolved solids and dissolved gases
  • Floating solids and dissolved inorganic solids
  • Bacteria and colloidal solids

15. Most suitable section of sewer in separate sewage system is

  • Rectangular section
  • Circular section
  • Standard form of egg shaped sewer
  • Modified egg shaped section

16. The most common cause of acidity in water is

  • Carbon dioxide
  • Oxygen
  • Hydrogen
  • Nitrogen

17. Period of cleaning of slow sand filters is about

  • 24 - 48 hours
  • 10 - 12 days
  • 2 - 3 months
  • 1 - 2 year

18. The means of access for inspection and cleaning of sewer line is known as

  • Inlet
  • Manhole
  • Drop manhole
  • Catch basin

19. Residual chlorine in water is determined by

  • Starch iodide method
  • Orthotolidine method
  • Both (A) and (B)
  • None of the above

20. The maximum efficiency of BOD removal is achieved in

  • Oxidation pond
  • Oxidation ditch
  • Aerated lagoons
  • Trickling filters

21. A sewer that receives the discharge of a number of house sewers is called

  • House sewer
  • Lateral sewer
  • Intercepting sewer
  • Sub-main sewer

22. As compared to geometrical increase method of forecasting population, arithmetical increase method gives

  • Lesser value
  • Higher value
  • Same value
  • Accurate value

23. Generally the detention period for grit chambers is kept as

  • 1 minute
  • 5 minutes
  • 24 hours
  • 12 hours

24. The rate of BOD exerted at any time is

  • Directly proportional to BOD satisfied
  • Inversely proportional to BOD remaining
  • Inversely proportional to BOD satisfied
  • Directly proportional to BOD remaining

25. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

  • Total alkalinity
  • Total hardness
  • Total hardness total alkalinity
  • Non carbonate hardness

26. In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

  • 100 ppm
  • 200 ppm
  • 300 ppm
  • 400 ppm

27. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

  • 1 ppm
  • 4 ppm
  • 10 ppm
  • 40 ppm

28. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

  • 1 mg/liter
  • 10 mg/liter
  • 100 mg/liter
  • 1000 mg/liter

29. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test

  • Only (i)
  • Both (i) and (ii)
  • Both (i) and (iii)
  • All (i), (ii) and (iii)

30. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

  • 10 to 25
  • 50
  • 75
  • 100

31. The type of sewer which is suitable for both combined and separate system is

  • Circular sewer
  • Egg shaped sewer
  • Horseshoe type sewer
  • Semi-elliptical sewer

32. 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 waterThe correct answer is

  • (i) and (ii)
  • (i)and(iv)
  • (ii) and (iii)
  • (ii) and (iv)

33. Double filtration is used

  • To increase the filtration slow sand filters capacity of
  • To increase the filtration rapid sand filters capacity of
  • For isolated buildings like pools, hotels etc swimming
  • All of the above

34. For normal sludge, the value of sludge index for Indian conditions is

  • 0 to 50
  • 50 to 150
  • 150 to 350
  • 350 to 500

35. Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank

  • Only (i)
  • (i) and (ii)
  • (i) and (iii)
  • Only (iii)

36. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

  • 0.2 to 0.4
  • 0.4 to 1.0
  • 2 to 4
  • 5 to 7

37. The percentage of chlorine in fresh bleaching powder is about

  • 10 to 15
  • 20 to 25
  • 30 to 35
  • 40 to 50

38. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

  • Separate system
  • Combined system
  • Partially combined system
  • Partially separate system

39. Dissolved oxygen in streams is

  • Maximum at noon
  • Minimum at noon
  • Maximum at midnight
  • Same throughout the day

40. If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

  • 4 mm/hr
  • 10 mm/hr
  • 20 mm/hr
  • 40 mm/hr

41. The rate of Alteration of pressure filters is

  • Less than that of slow sand filters
  • In between the filtration rate of slow sand filters and rapid sand filters
  • Greater than that of rapid sand filters
  • Equal to that of slow sand filters

42. A pipe which is installed in the house drainage to preserve the water seal of traps is called

  • Vent pipe
  • Anti-siphonage pipe
  • Waste pipe
  • Soil pipe

43. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

  • N = y + R
  • y = N + R
  • R = N + y
  • R > (N + y)

44. Which of the following is not a water borne disease?

  • Dysentery
  • Cholera
  • Typhoid
  • Malaria

45. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

  • Reflux valve
  • Sluice valve
  • Air relief valve
  • Pressure relief valve

46. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

  • 0.01 to 0.05 ppm
  • 0.05 to 0.5 ppm
  • 0.5 to 1.0 ppm
  • 1.0 to 5.0 ppm

47. Which of the following retards the self purification of stream?

  • Higher temperature
  • Sunlight
  • Satisfying oxygen demand
  • None of the above

48. Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filtersThe correct answer is

  • (i) and (ii)
  • (ii) and (iii)
  • (i) and (iv)
  • (ii) and (iv)

49. Sewage treatment units are normally designed for

  • 5 - 10 years
  • 15 - 20 years
  • 30 - 40 years
  • 40 - 50 years

50. Sewerage system is usually designed for

  • 10 years
  • 25 years
  • 50 years
  • 75 years

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