Environmental Engineering MCQ with Answers pdf download

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Best Environmental Engg MCQ Questions

Environmental Engineering MCQ with Answers pdf download


1. If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be
A. 20 mm/hr
B. 40 mm/hr
C. 4 mm/hr
D. 10 mm/hr
Answer: Option B


2. The rate of Alteration of pressure filters is
A. Greater than that of rapid sand filters
B. Equal to that of slow sand filters
C. Less than that of slow sand filters
D. In between the filtration rate of slow sand filters and rapid sand filters
Answer: Option A


3. The rate of BOD exerted at any time is
A. Inversely proportional to BOD satisfied
B. Inversely proportional to BOD remaining
C. Directly proportional to BOD satisfied
D. Directly proportional to BOD remaining
Answer: Option D


4. Sludge volume index is defined as the ratio of
A. Percentage of suspended solids by weight to percentage of sludge by volume
B. Percentage of total solids by weight to percentage of sludge by volume
C. Percentage of sludge by volume to percentage of suspended solids by weight
D. Percentage of sludge by volume to percentage of total solids by weight
Answer: Option C


5. The polluted water is one which
A. Is safe and suitable for drinking and domestic use
B. Is contaminated
C. Contains pathogenic bacteria
D. Consists of undesirable substances rendering it unfit for drinking and domestic use
Answer: Option D


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6. The gas from sludge digestion tank is mainly composed of
A. Hydrogen sulphide
B. Methane
C. Nitrogen
D. Carbon dioxide
Answer: Option B


7. Disinfection of water results in
A. Killing of disease bacteria
B. Complete sterilisation
C. Removal of turbidity
D. Removal of hardness
Answer: Option A


8. In chlorination, with the rise in temperature of water, death rate of bacteria
A. Remains unaffected
B. None of the above
C. Increases
D. Decreases
Answer: Option C



9. The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is
A. Electrical analysis method
B. Hardy cross method
C. Circle method
D. Equivalent pipe method
Answer: Option C

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10. Orthotolidine test is used for determination of
A. Biochemical oxygen demand
B. Dose of coagulant
C. Dissolved oxygen
D. Residual chlorine
Answer: Option D


11. Which of the following retards the self purification of stream?
A. Satisfying oxygen demand
B. None of the above
C. Higher temperature
D. Sunlight
Answer: Option B



12. Which of the following is not a water borne disease?
A. Typhoid
B. Malaria
C. Dysentery
D. Cholera
Answer: Option B


13. 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. (ii) and (iii)
B. (ii) and (iv)
C. (i) and (ii)
D. (i)and(iv)
Answer: Option D


14. As compared to cast iron pipes, steel pipes are
A. Costlier
B. Less susceptible to corrosion
C. Heavier
D. Stronger
Answer: Option D


15. The percentage of chlorine in fresh bleaching powder is about
A. 30 to 35
B. 40 to 50
C. 10 to 15
D. 20 to 25
Answer: Option A

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16. Double filtration is used
A. For isolated buildings like pools, hotels etc swimming
B. All of the above
C. To increase the filtration slow sand filters capacity of
D. To increase the filtration rapid sand filters capacity of
Answer: Option C


17. An egg shaped section of sewer
A. Is more stable than circular section
B. Is easy to construct
C. Is economical than circular section
D. Provides self cleansing velocity at low discharges
Answer: Option D


18. Sewage treatment units are designed for
A. Average flow only
B. Maximum and minimum flow
C. Maximum flow only
D. Minimum flow only
Answer: Option A


19. The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
A. 10 ppm
B. 40 ppm
C. 1 ppm
D. 4 ppm
Answer: Option D


20. The length of rectangular sedimentation tank should not be more than
A. 4B
B. 8B
C. B
D. 2B
Answer: Option A

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21. The minimum and maximum diameters of sewers shall preferably be
A. 30 cm and 450 cm
B. 60 cm and 300 cm
C. 15 cm and 100 cm
D. 15 cm and 300 cm
Answer: Option D


22. Laying of sewers is usually done with the help of
A. Sight rails and boning rods
B. A plane table
C. A Theodolite
D. A compass
Answer: Option A


23. The means of access for inspection and cleaning of sewer line is known as
A. Drop manhole
B. Catch basin
C. Inlet
D. Manhole
Answer: Option D


24. Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
A. Dissolved oxygen in water
B. Residual chlorine in water
C. Hardness in water
D. Turbidity in water
Answer: Option C



25. Sewage treatment units are normally designed for
A. 30 - 40 years
B. 40 - 50 years
C. 5 - 10 years
D. 15 - 20 years
Answer: Option D


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26. Facultative bacteria are able to work in
A. Presence as well as in absence of oxygen
B. Presence of water
C. Presence of oxygen only
D. Absence of oxygen only
Answer: Option A


27. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
A. Air relief valve
B. Pressure relief valve
C. Reflux valve
D. Sluice valve
Answer: Option C


28. Septic tank is a
(i) Settling tank
(ii) Digestion tank
(iii) Aeration tank
A. (i) and (iii)
B. Only (iii)
C. Only (i)
D. (i) and (ii)
Answer: Option D


29. The distribution mains are designed for
A. Average daily demand
B. Maximum hourly demand on maximum day
C. Maximum daily demand
D. Maximum hourly demand
Answer: Option B



30. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
A. BOD > COD > TOD
B. COD > BOD > TOD
C. TOD > BOD > COD
D. TOD > COD > BOD
Answer: Option D

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31. The biochemical treatment of sewage effluents is essentially a process of
A. Reduction
B. Alkalinization
C. Oxidation
D. Dehydration
Answer: Option C


32. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about
A. 0.5 to 1.0 ppm
B. 1.0 to 5.0 ppm
C. 0.01 to 0.05 ppm
D. 0.05 to 0.5 ppm
Answer: Option D


33. As compared to geometrical increase method of forecasting population, arithmetical increase method gives
A. Same value
B. Accurate value
C. Lesser value
D. Higher value
Answer: Option C


34. The type of sewer which is suitable for both combined and separate system is
A. Horseshoe type sewer
B. Semi-elliptical sewer
C. Circular sewer
D. Egg shaped sewer
Answer: Option D



35. For normal sludge, the value of sludge index for Indian conditions is
A. 150 to 350
B. 350 to 500
C. 0 to 50
D. 50 to 150
Answer: Option A

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36. Residual chlorine in water is determined by
A. Both (A) and (B)
B. None of the above
C. Starch iodide method
D. Orthotolidine method
Answer: Option A


37. The water carriage system of collection of waste product
A. Creates hygienic problem
B. All of the above
C. Is cheaper in initial cost than dry conservancy system
D. Requires treatment before disposal
Answer: Option D


38. A sewer that receives the discharge of a number of house sewers is called
A. Intercepting sewer
B. Sub-main sewer
C. House sewer
D. Lateral sewer
Answer: Option D


39. In facultative stabilization pond, the sewage is treated by
A. Dual action of aerobic bacteria and anaerobic bacteria
B. Sedimentation
C. Aerobic bacteria only
D. Algae only
Answer: Option A



40. A pipe which is installed in the house drainage to preserve the water seal of traps is called
A. Waste pipe
B. Soil pipe
C. Vent pipe
D. Anti-siphonage pipe
Answer: Option D

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41. 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°A. The BOD of raw sewage will be
A. 300 ppm
B. 400 ppm
C. 100 ppm
D. 200 ppm
Answer: Option D


42. The maximum permissible limit for fluoride in drinking water is
A. 5 mg/liter
B. 10 mg/liter
C. 0.1 mg/liter
D. 1.5 mg/liter
Answer: Option D


43. 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
A. Both (i) and (iii)
B. All (i), (ii) and (iii)
C. Only (i)
D. Both (i) and (ii)
Answer: Option B


44. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be
A. Partially combined system
B. Partially separate system
C. Separate system
D. Combined system
Answer: Option C


45. Generally the detention period for grit chambers is kept as
A. 24 hours
B. 12 hours
C. 1 minute
D. 5 minutes
Answer: Option C

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46. The most common cause of acidity in water is
A. Hydrogen
B. Nitrogen
C. Carbon dioxide
D. Oxygen
Answer: Option C


47. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
A. Total hardness total alkalinity
B. Non carbonate hardness
C. Total alkalinity
D. Total hardness
Answer: Option C

48. Activated carbon is used for
A. Removing odours
B. Removing corrosiveness
C. Disinfection
D. Removing hardness
Answer: Option A


49. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
A. 100 mg/liter
B. 1000 mg/liter
C. 1 mg/liter
D. 10 mg/liter
Answer: Option D



50. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
A. R = N + y
B. R > (N + y)
C. N = y + R
D. y = N + R
Answer: Option C

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51. Dissolved oxygen in streams is
A. Maximum at midnight
B. Same throughout the day
C. Maximum at noon
D. Minimum at noon
Answer: Option C


52. As compared to shallow wells, deep wells have
A. More discharge
B. Less discharge
C. More depth
D. Less depth
Answer: Option A


53. The characteristics of fresh and septic sewage respectively are
A. Both acidic
B. Both alkaline
C. Acidic and alkaline
D. Alkaline and acidic
Answer: Option D


54. Period of cleaning of slow sand filters is about
A. 2 - 3 months
B. 1 - 2 year
C. 24 - 48 hours
D. 10 - 12 days
Answer: Option A



55. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
A. 8.5 to 10.0
B. 10.5 to 12.0
C. 4.5 to 6.0
D. 6.5 to 8.0
Answer: Option D


56. 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 (iv)
B. (ii) and (iv)
C. (i) and (ii)
D. (ii) and (iii)
Answer: Option A


57. The self cleansing velocity for all sewers in India is usually
A. 1.5 m/sec to 2.0 m/sec
B. 3.0 m/sec to 3.5 m/sec
C. Less than 1.0 m/sec
D. 1.0 m/sec to 1.2 m/sec
Answer: Option D


58. In water treatment, rapid gravity filters are adopted to remove
A. Floating solids and dissolved inorganic solids
B. Bacteria and colloidal solids
C. Dissolved organic substances
D. Dissolved solids and dissolved gases
Answer: Option B


59. Sewerage system is usually designed for
A. 50 years
B. 75 years
C. 10 years
D. 25 years
Answer: Option D



60. 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 filters
The correct answer is
A. (i) and (iv)
B. (ii) and (iv)
C. (i) and (ii)
D. (ii) and (iii)
Answer: Option A

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61. The rate of filtration in slow sand filters in million litres per day per hectare is about
A. 500 to 600
B. 1400 to 1500
C. 50 to 60
D. 100 to 150
Answer: Option C


62. The phenolic compounds in public water supply should not be more than
A. 0.001 ppm
B. 0.0001 ppm
C. 0.1 ppm
D. 0.01 ppm
Answer: Option A


63. The maximum efficiency of BOD removal is achieved in
A. Aerated lagoons
B. Trickling filters
C. Oxidation pond
D. Oxidation ditch
Answer: Option D


64. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
A. 2 to 4
B. 5 to 7
C. 0.2 to 0.4
D. 0.4 to 1.0
Answer: Option A


65. The pathogens can be killed by
A. Oxidation
B. None of the above
C. Nitrification
D. Chlorination
Answer: Option D

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66. Most suitable section of sewer in separate sewage system is
A. Standard form of egg shaped sewer
B. Modified egg shaped section
C. Rectangular section
D. Circular section
Answer: Option D
The hourly variation factor is usually taken as
A. 2.0
B. 2.7
C. 1.5
D. 1.8
Answer: Option C


67. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
A. 75
B. 100
C. 10 to 25
D. 50
Answer: Option A


68. The working conditions in imhoff tanks are
A. Aerobic in lower compartment and anaerobic in upper compartment
B. Anaerobic in lower compartment and aerobic in upper compartment
C. Aerobic only
D. Anaerobic only
Answer: Option B



69. Which of the following values of pH represents a stronger acid?
A. 7
B. 10
C. 2
D. 5
Answer: Option C


70. A pipe which is installed in the house drainage to preserve the water seal of traps is called
A. Waste pipe
B. Soil pipe
C. Vent pipe
D. Anti-siphonage pipe
Answer: Option D

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