A. Dental cavity
B. Tooth decay
C. Fluorosis
D. Respiratory disease
Related Mcqs:
- Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?
A. Dental cavities
B. Scale formation
C. Water-borne disease
D. Corrosion - Presence of nitrates in water in excess of 50 ppm causes________________?
A. Methemoglobinemia
B. Gastroenteritis
C. Asphyxiation
D. Tooth decay - Insufficient washing of sand grains in a rapid sand filter causes__________________?
A. Air binding
B. Shrinkage of filtering media
C. Mud balls
D. Expansion of filtering media - Thermal pollution due to excessive heat & temperature in the working place causes__________________?
A. Reduction in working efficiency of manpower
B. Fatigue
C. High breathing rate
D. All A., B. & C. - Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?
A. Blood poisoning
B. Anaemia
C. Nervous system disorder
D. All A., B. & C. - Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
A. Mercury
B. Lead
C. Fluoride
D. Arsenic - 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 dissolved impurities of ______________ is responsible for the red brownish color of water?
A. Carbonates
B. Bi-carbonates
C. Iron & manganese
D. Arsenic - Presence of _____________ hardness is responsible for the temporary hardness in water?
A. Carbonate
B. Calcium
C. Chloride
D. Sulphate - Presence of ____________ in water stream are deleterious to aquatic life?
A. Soluble and toxic organics
B. Suspended solids
C. Heavy metals and cyanides
D. All A., B. & C.
