MCQ in Environmental Engineering Part 2 | Engineering Board Exam

This is the Multiple Choice Questions Part 2 of the Series in Environmental Engineering (Environmental Science) as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

Continue Practice Exam Test Questions Part 2 of the Series

⇐ MCQ in Environmental Engineering Part 1 | Engineering Board Exam

Choose the letter of the best answer in each questions.

51. In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?

A. flocculent settling

B. hindered settling

C. compression settling

D. discrete settling

52. In which settling type, dilute suspension of particles takes place?

A. zone settling

B. compression settling

C. hindered settling

D. discrete settling

53. What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10^-3 cm. Given G=2.65, viscosity v=8 * 10^-3 cm²/Sec?

A. 0.01 cm/sec

B. 0.13 cm/sec

C. 0.24 cm/sec

D. 0.36 cm/sec

54. The average time required by water to pass through the settling tank is called

A. detention time

B. flow through period

C. time of flow

D. mean time

55. In preliminary treatment of sewage, the operation which takes place, is

A. removal of fine suspended particles

B. removal of fine dissolved organic material

C. removal of lighter floating material

D. removal of harmful bacteria and other organisms

56. How many types of aerators are commonly used in the treatment of wastewater?

A. 2

B. 3

C. 4

D. 5

57. The detention period of detritus tank is

A. 40 seconds

B. 1 minute

C. 3 minute

D. 1 hour

58. How many types of trickling filters are used in sewage treatment?

A. a)

B. 5

C. 3

D. 2

59. The depth of the filter media of intermittent filter is

A. 45 cm

B. 60 cm

C. 20 cm

D. 25 cm

60. Which of the following filter is used in the anaerobic treatment of sewage?

A. intermittent sand

B. trickling filter

C. contact filter

D. biological filter

61. The maximum size of filter media of a percolating filter is

A. 10 mm

B. 25 mm

C. 60 mm

D. 75 mm

62. The recirculation ratio for the low rate trickling filter is

A. 1

B. 2

C. 3

D. 0

63. The BOD after the filtration of sewage from the low rate trickling filter is

A. 40-50%

B. 80-90%

C. 70-80%

D. 90-99%

64. The efficiency of a percolating filter is given by _________.

A. 100/(1+0.0044 (µ))

B. 100/(1+0.044(µ)^1/2)

C. 100/(1+0.44(µ)^1/2)

D. 100/(1+0.0044(µ)^1/2)

65. The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency of the filter?

A. 0.431

B. 0.883

C. 0.0704

D. 0.83

66. The color of the secondary sludge produced from the high rate trickling filter is

A. gray

B. black

C. brown

D. green

67. _____ is the ratio of volume of recirculated sewage to the raw sewage.

A. recirculation factor

B. recirculation ratio

C. food to mass ratio

D. bod

68. The size of filter media in a high rate trickling filter is

A. 10-20mm

B. 34-68mm

C. 25-60mm

D. 20-50mm

69. Which of the following is called as air diffusion method?

A. activated sludge aeration

B. diffused air aeration

C. mechanical aeration

D. combined aeration

70. The maximum depth of aeration tank used in activated sludge process is

A. 1 m

B. 2 m

C. 4.5 m

D. 5.5 m

71. Which type of reactor is used for mixing chemicals in water treatment?

A. continuous reactor

B. batch reactor

C. plug flow reactor

D. fixed bed reactor

72. Which reactors are characterized by non- continuous reactions?

A. plug flow reactor

B. continuous reactor

C. batch reactor

D. fluidized bed reactor

73. SBR is a type of

A. aerobic process

B. activated sludge process

C. anaerobic process

D. chemical process

74. How is mixing done in SBR?

A. manual

B. mechanical

C. air stripping

D. agitation by air

75. In which stage of the SBR is aeration performed?

A. first

B. second

C. third

D. fourth

76. Which of the following is an anaerobic process for treating sewage?

A. oxidation pond

B. imhoff tank

C. oxidation ditch

D. rotating biological contactors

77. The minimum design depth of oxidation pond is

A. 0.3 m

B. 0.5 m

C. 1 m

D. 1.5 m

78. The detention period of oxidation pond is

A. 12-36 hours

B. 4 hours

C. 10-20 days

D. 30-60 seconds

79. The maximum BOD removal efficiency of an oxidation pond is

A. 0.9

B. 0.68

C. 0.7

D. 0.8

80. What is the minimum depth of water to be kept in the oxidation pond?

A. 0.3 m

B. 0.5 m

C. 1 m

D. 1.5 m

81. What is the shape of the oxidation ditch?

A. square

B. rectangular

C. circular

D. oval

82. The ditch is lined by _____ layer.

A. brick

B. cement

C. permeable

D. impermeable

83. What is the range of MLSS concentration in oxidation ditch?

A. 500-1000 mg/l

B. 1000-2000 mg/l

C. 2000-4000mg/l

D. 3000-5000 mg/l

84. Which of the following process is not adopted in oxidation ditches?

A. adsorption

B. desorption

C. oxidation

D. decomposition

85. The disposal of sewage from the septic tank is done by which of the following?

A. clarifier

B. soak pit

C. aerated lagoon

D. lamp holes

86. The detention period of a septic tank is

A. 2 hours

B. 12-36 hours

C. 4 hours

D. 1 week

87. The concentration of biodegradable organic matter after the septic tank is

A. 50 ppm

B. 100 ppm

C. 200 ppm

D. 75 ppm

88. What is the maximum design flow of sewage in a septic tank?

A. 70 liters per person per day

B. 100 liters per person per day

C. 30 liters per person per day

D. 40 liters per person per day

89. Which of the following is not the method of disposal of sewage from septic tank?

A. up flow anaerobic filter

B. soil absorption system

C. vacuum filter

D. biological filters

90. The minimum depth of septic tank as per design consideration is

A. 1.8 m

B. 1 m

C. 1.2 m

D. 1.5 m

91. Number of births per 1000 is

A. Growth rate

B. Conception rate

C. Reproduction rate

D. Crude birth rate

92. Turbidity of water is usually measured in terms of

A. Sodium scale

B. Silica scale

C. Cobalt scale

D. Platinum scale

E. Calcium scale

93. Which of the following pollutant affects lungs?

A. Silica

B. Benzene

C. Lead

D. Aldrin

E. None of the above

94. Black holes are celestial bodies which

A. Have strong magnetic field

B. Have strong electrical field

C. Do not allow any light to escape outside

D. Are self-luminous bodies

E. Green

95. The emission of carbon monoxide in automobile exhaust will be low when the vehicle is

A. idling

B. accelerating

C. cruising at low speeds

D. cruising at high speeds

E. None of the above

96. Temporary hardness in water in caused by salts like

A. Sulphates

B. Nitrates

C. Chlorides

D. Carbonates

E. All of the above

97. The colour of water is measured

A. In terms of pH value

B. In terms of degree of hardness

C. In terms of platinum cobalt scale

D. ppm of dissolved solids

E. None of the above

98. Air pollutants common to urban environments are

A. sulphur dioxide

B. particulate matter

C. Hydrocarbons

D. All of the above

E. None of the above

99. Ionization chamber can be used for the detection of all of the following EXCEPT

A. beta rays

B. X-rays

C. gamma rays

D. Alpha rays

E. None of the above

100. Which of the following is used in the recently developed technology for communication?

A. Optical fiber

B. Glass fiber

C. Nylon fiber

D. Quartz fiber

E. None of these

Complete List of MCQs in General Engineering and Applied Science per topic