Grit
Dust
Powder
Smoke
✅ The correct answer is option A.
Enviornmental Engineering MCQs
Most of the bacteria in sewage are
Parasitic
Saprophytic
Anerobic
None of these
✅ The correct answer is option B.
In the context of the chemical process industries, the term BOD is normally associated with the
Characterisation of solid wastes
Organic concentration in gaseous effluents
Characterisation of liquid effluents
Characterisation of boiler feed water
✅ The correct answer is option C.
What are the methods of treatment & disposal of radioactive wastes?
Evaporation & chemical precipitation
Biological methods & adsorption in ion exchange materials
Fixing into a solid mass with cement and sinking deep in the sea
All of the above
✅ The correct answer is option D.
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
Dental cavities
Scale formation
Water-borne disease
Corrosion
✅ The correct answer is option A.
Aerosols present in atmospheric air may be
Positively charged
Negatively charged
Neutral
Combination of all A, B & C
✅ The correct answer is option D.
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?
Chlorine
Alkalis
Benzene hexachloride
Alkyl benzene sulphonate (ABS)
✅ The correct answer is option A.
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
Acts as a green house gas thereby raising earth’s temperature
Causes asphyxia
Causes increase in sea level
Inhances the green house effect
✅ The correct answer is option B.
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Natural aeration of water stream
Photosynthetic action of algae
Both A & B
Neither A nor B
✅ The correct answer is option C.
Presence of high concentration of ozone and smog in atmospheric air causes the
Embrittlement & decrease of folding resistance of paper
Cracking of rubber products
Fading of dye on textiles
Damage of electrical insulator on high tension power line
✅ The correct answer is option B.