200 Best MCQs on Water Treatment- biochemical engineering
Q17). Sanitizer used specifically for vitreous enamel are
a).strong alkalis
b).strong acids
c).weak alkali with sodium silicate
d).none of these
Correct Answer:
weak alkali with sodium silicate
Explaination:
Q18). The common methods used for disinfection in waste water treatment plants are
a).chlorination
b).UV light
c).both (a) and (b)
d).Phenolic solvent
Correct Answer:
both (a) and (b)
Explaination:
Q19). Inhibitors are used along with sanitizer to
a).improve their action
b).to prevent corrosion
c).both (a) and (b)
d).none of these
Correct Answer:
to prevent corrosion
Explaination:
Q20). Sanitizers used for rubber made equipments are
a).strong acids
b).strong alkalis
c).combination of both
d).none of these
Correct Answer:
strong alkalis
Explaination:
Q21). Which of the following substances are commonly used in a filter?
a).Charcoal
b).Sand
c).Both (a) and (b)
d).Aluminum chloride
Correct Answer:
Both (a) and (b)
Explaination:
Q22). Biological oxidation processes usually referred as biological treatment, are the most common form of
a).primary treatment
b).secondary treatment
c).tertiary treatment
d).all of these
Correct Answer:
secondary treatment
Explaination:
Q23). The maximum permissible limit (BIS) of turbidity in drinking water is
a).5 NTU
b).10 NTU
c).15 NTU
d).20 NTU
Correct Answer:
10 NTU
Explaination:
Q24). Sedimentation is a physical process used in wastewater treatment to
a).remove particles that are less dense than water
b).remove particles that are more dense than water
c).remove the pertinacious material from the water
d).none of the above
Correct Answer:
remove particles that are more dense than water
Explaination: