The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent?

A. Air binding
B. Shrinkage of filtering media
C. Mud balls
D. Expansion of filtering media

A. CO, CO2 & SO2
B. H2S, NO & SO3
C. CO2, H2S & NO2
D. SO3, NO2 & CO2

A. Fading of dyes on textiles
B. Corrosion, tarnishing & soiling of metals
C. Reduced strength of textiles
D. All A., B. and C.

A. Turbidity
B. Caustic embrittlement
C. Suspended silica
D. Dissolved oxygen

A. Suspended inorganic matter
B. Dissolved solids
C. Floating solids
D. Dissolved gases

A. Iron
B. Zinc
C. Iodine
D. Bromine