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Home⇒ Medical Science⇒ Bochemical Engineering⇒ Water treatment
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Permanent hardness of water is caused by the presence of chlorides and sulfates of calcium and magnesium [other wrong options] [Discuss in forum] bicarbonates of calcium and magnesium carbonates of sodium and potassium phosphates of sodium and potassium |
Q22 ⇒ Which of the following substances are commonly used in a filter? Both (a) and (b) [other wrong options] [Discuss in forum] Charcoal Sand Aluminum chloride |
Q23 ⇒ The maximum desirable limit (BIS of mercury in the drinking water is 0.001 mg/l [other wrong options] [Discuss in forum] 0.05 mg/l 0.9 mg/l 0.1 mg/l |
Q24 ⇒ The activated sludge process is sometime referred as fluid bed biological oxidation system [other wrong options] [Discuss in forum] fixed bed biological oxidation system turning bed biological oxidation system none of the above |
Q25 ⇒ The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is 0.05 mg/l [other wrong options] [Discuss in forum] 0.09 mg/l 0.1 mg/l 1.0 mg/l |
Q26 ⇒ Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with 10% sodium chloride solution [other wrong options] [Discuss in forum] 10% calcium chloride solution 10% magnesium sulfate solution 10% magnesium chloride solution |
Q27 ⇒ Secondary treatment uses __________ to consume wastes. micro-organisms [other wrong options] [Discuss in forum] chemicals filtration none of these |
Q28 ⇒ Sanitizer used specifically for vitreous enamel are weak alkali with sodium silicate [other wrong options] [Discuss in forum] strong alkalis strong acids none of these |
Q29 ⇒ Inhibitors are used along with sanitizer to to prevent corrosion [other wrong options] [Discuss in forum] improve their action both (a) and (b) none of these |
Q30 ⇒ Permanent hardness of water may be removed by the addition of soda ash [other wrong options] [Discuss in forum] lime potassium permagnate sodium bicarbonate |
Q31 ⇒ Lagoons may be characterized as all of these [other wrong options] [Discuss in forum] anaerobic facultative aerated |
Q32 ⇒ Both temporary and permanent hardness of water can be removed by distillation [other wrong options] [Discuss in forum] boiling filtration decantation |
Q33 ⇒ Hardness of water does not make it unfit for drinking [other wrong options] [Discuss in forum] have any bad effect in boiler make cooking of foods difficult cause difficulty in the washing of clothes with soaps |
Q34 ⇒ Which of the following chemical is sometime added in the process of coagulation and flocculation? Aluminum sulphate [other wrong options] [Discuss in forum] Aluminum oxide Calcium chloride None of these |
Q35 ⇒ Sedimentation is a physical process used in wastewater treatment to remove particles that are more dense than water [other wrong options] [Discuss in forum] remove particles that are less dense than water remove the pertinacious material from the water none of the above |
Q36 ⇒ Calgon is used for removal of permanent hardness of water [other wrong options] [Discuss in forum] sodium carbonate potassium carbonate none of these |
Q37 ⇒ Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as insoluble zeolites [other wrong options] [Discuss in forum] insoluble carbonates insoluble chlorides insoluble sulfates |
Q38 ⇒ The chemical oxygen demand (COD)measures the amount of oxygen that would be removed from the water in order to oxidize pollution [other wrong options] [Discuss in forum] amount of oxygen required for growth of microorganisms in water amount of oxygen required to oxidize the calcium present in waste water none of the above |
Q39 ⇒ Acid used mostly for removal of milk stone is nitric acid [other wrong options] [Discuss in forum] phosphoric acid gluconic acid tartaric acid |
Q40 ⇒ The maximum permissible limit (BIS) of turbidity in drinking water is 10 NTU [other wrong options] [Discuss in forum] 5 NTU 15 NTU 20 NTU |
Or |