Suspended inorganic matter
Dissolved solids
Floating solids
Dissolved gases
✅ The correct answer is option A.
Enviornmental Engineering MCQs
White smoke coming out of the chimney of a furnace indicates the use of
Low excess air
Very high excess air
Gaseous fuel in the furnace
Liquid fuel in the furnace
✅ The correct answer is option B.
In water chemical treatment plant, use of chloramines ensures
Disinfection
Taste & odour control
Weed control in reservoirs
Removal of permanent hardness
✅ The correct answer is option A.
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
1 to 2
4 to 5
9 to 10
15 to 20
✅ The correct answer is option B.
Which of the following is the most severe air pollutant?
Hydrocarbons
NOx
SO₂
CO
✅ The correct answer is option B.
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
1
7
19
82
✅ The correct answer is option B.
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
Reynold stresses
Shear forces
Both A & B
Neither A nor B
✅ The correct answer is option C.
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
Carbonates
Bi-carbonates
Iron & manganese
Arsenic
✅ The correct answer is option C.
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
Biological oxygen pond
Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
Lagoons
Filtration
✅ The correct answer is option B.
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
Food industry
Municipal sewage treatment
Petroleum refinery
Iron & steel plant
✅ The correct answer is option A.