এনভায়রনমেন্টাল ইঞ্জিনিয়ারিং MCQ
সিভিল ইঞ্জিনিয়ারিং এ চাকরি প্রস্তুতির জন্য "এনভায়রনমেন্টাল ইঞ্জিনিয়ারিং" সাবজেক্টের সকল MCQ এই ফোল্ডারে পাবেন। Civil Engineering এর চাকরি নিয়োগ, রেজাল্ট, সাজেশন, অনলাইন ক্লাসের জন্য আমাদের App: Engineering Classroom গুগল প্লে-স্টোর থেকে ডাউনলোড করে নিন। Environmental MCQ
61. Absolute pure water is good for health.
right
wrong
62. The term sullage refers to-
fresh waste water
waste water from kitchen and laundry
septic waste water
toxic waste water
63. What do you mean by BOD?
Best organized demand
Biochemical oxygen demand
Before oxidation damage
Bacteria of damage
64. Slow sand filter is efficient to remove the bacteria from the raw water to an extent of-
50%
70%
85%
99%
65. A manhole is generally provided at each-
bend
change of gradient
junction
all the above
66. Standard BOD is measured at-
20°C-1 day
25°C-3 day
20°C-5 day
30°C-5 day
67. The maximum permissible quantity of lead in water for domestic supplies is-
0.01 ppm
0.05 ppm
0.50 ppm
1 ppm
68. Absolute zero temperature = ?
0°C
273°C
-273°C
None
69. The most common coagulant is-
magnesium culfater
alum
chlorine
bleaching powder
70. The diameter of a domestic sewer pipe laid at gradient 1 in 100 is recommended ------
100 mm
200mm
150mm
175mm
71. Main element of biogas is
CO2
Cow dung
Water
CH4
72. What is the example of metamorphic rock?
granite
genesis
marble
all of these
73. Disinfection of water results in-
Removal of turbidity
Removal of taste
Killing of disease bacteria
Removal of hardness
74. The water obtained from is generally known as sub-surface water---
rain
reservoirs
rivers
artesian wells
75. Which of the following protects penstock due to sudden variation of flow or velocity of water?
Anchors
Trash rack
Forebays
Surge tank
76. The maximum permissible limit for iron in drinking water is-
0.1 mg/L
0.3-1 mg/L
2-2.5 mg/L
5 mg/L
77. Arsenic contamination has primarily affected-
the deep aquifer
the river
the shallow aquifer
none
78. A pipe conveying sewage from plumbing system of a single building to common sewer is called-
house sewer
lateral sewer
main sewer
submain sewer
79. The presence of sodium chloride in water-
stops epidemic
increases hardness of water
causes bad taste
softens the water
80. The water obtained from a lake is known as surface water.
Agree
Disagree