PM2.5 refers to
A. Mass of particles of size less than 2.5 μrn
B. Mass of particles of size greater than 2.5 μrn
C. Number of particles of size less than 2.5 μrn
D. Number of particles of size greater than 2.5 μrn
Answer: Option C
This Question Belongs to Biotechnology Engineering >> Environmental Biotechnology
Ozone depletion is caused by the increase in the level of
A. Water vapour
B. Chlorofluro carbon (CFC)
C. Oxygen
D. Carbon monoxide
Which of the following is a beneficial activity of microorganisms?
A. Some microorganisms use carbon dioxide
B. Some microorganisms provide nitrogen for plant growth
C. Some microorganisms are used in sewage treatment
D. All the above
Which of the following parameters indicates the organic pollution of a water sample?
A. pH
B. Turbidity
C. Hardness
D. COD
The chemical system for removal of the ions of level of salt is called
A. Ion transfer
B. Ionization
C. Ion exchange
D. Ion vaporization
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