Related Questions

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
A 1.5-2
B 3.5-4.5
C 7-9
D 12-14
Growth of __________ is promoted by the presence of manganese in water.
A Files
B Algae
C Micro-organisms
D Mosquitoes
Iron and manganese present as pollutants in water cannot be removed by________
A Oxidation followed by settling and filtration
B Chlorination
C Ion exchange process
D Lime soda process or manganese zeolite process
Presence of manganese in alloy steel improves its
A Corrosion resistance
B Cutting ability
C Abrasion resistance & toughness
D Elasticity & creep resistance
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
A Foaming
B Odour nuisances
C Undesirable plant growth
D Turbidity
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
A Fire hazards
B Explosion hazards
C Persistent foam
D Depletion of dissolved oxygen
Presence of excess flourine in water causes
A Dental cavity
B Tooth decay
C Fluorosis
D Respiratory disease
Presence of soluble organics in polluted water causes
A Undesirable plants growth
B Depletion of oxygen
C Fire hazards
D Explosion hazards
Presence of bacteria in potable (drinking) water causes
A Turbidity
B Disease
C Bad odour
D Bad taste & colour
Presence of __________ bacteria in water causes disease like typhoid.
A Aerobic
B Pathogenic
C Anaerobic
D Non-pathogenic

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