1
20
100
1000
✅ The correct answer is option B.
Chemical Engineering MCQs
The function of skimming tank in sewage treatment is to remove __________ substances.
Dissolved solid
Suspended solid
Oil & fatty
Gritty & inorganic
✅ The correct answer is option C.
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called
Grit
Dust
Powder
Smoke
✅ The correct answer is option A.
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.