Soluble and toxic organics
Suspended solids
Heavy metals and cynides
All of the above
✅ The correct answer is option D.
Chemical Engineering MCQs
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
Pipe vibrations
Cavitation
Boundary layer separation
Fluctuation in liquid flow
✅ The correct answer is option B.
Presence of iron and manganese in water causes
Reduction in its dissolved oxygen content
Discoloration of bathroom fixtures
Temporary hardness
None of these
✅ The correct answer is option B.
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
Cesspool
Lagoon
Skimming mill
Septic tank
✅ The correct answer is option D.
Pollution by particulate matter emission in the atmosphere does not take place during metal
Grinding
Machining
Cutting
Polishing
✅ The correct answer is option D.
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.
2
42
332
1050
✅ The correct answer is option B.
In a sedimentation tank, the detention period for water ranges from __________ hours.
2 to 4
8 to 12
16 to 20
24 to 32
✅ The correct answer is option A.
Lagooning process is mainly a means of the
Sludge disposal
Reduction of excessive flow in sewers
Biological treatment of wastes
None of these
✅ The correct answer is option A.
Which of the following industries discharge mercury as a pollutant?
Chloro-alkali industry
Tanneries
Beverage plant
Phosphoric acid plant
✅ The correct answer is option A.
Tolerable limit of nitrogen oxides in air is __________ ppm.
0.1
1
5
25
✅ The correct answer is option C.