Related Questions

Presence of a certain minimum quantity of flourine is desirable in potable water to prevent
A Dental cavities
B Scale formation
C Water-borne disease
D Corrosion
During conversion of ammonium carbamate into urea, presence of large excess of water
A Increases the yield of urea
B Adversely affects the yield of urea
C Reduces the evaporator load by diluting the urea solution
D Does not affect the yield of urea
Which one of the following soil types of India is rendered infertile by the presence of excess iron?
A Desert sand
B Alluvial
C Podzolic
D Lateritic
The ‘Green House effect’ is produced due to the presence of excess amount of
A Sulphur dioxide
B Nitrogen dioxide
C Carbon monoxide
D Methane
The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called
A air pollution
B water pollution
C soil pollution
D radioactive pollution
The cement becomes unsound by the presence of excess
A Sulphur
B Magnesia
C Lime
D All of these
Heating of an ore below its melting point in presence of excess of air is called
A Calcination
B Smelting
C Roasting
D Sublimation
Presence of iron and manganese in water causes
A Reduction in its dissolved oxygen content
B Discoloration of bathroom fixtures
C Temporary hardness
D None of these
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 soluble organics in polluted water causes
A Undesirable plants growth
B Depletion of oxygen
C Fire hazards
D Explosion hazards

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