Chemistry - Study Mode

[#711] Physico-chemical characteristics of water in water sources undergo changes due to
Correct Answer

(C) Effluents

Explanation

Solution: Aquatic macrophytes, aquatic fungi are natural organism and evapotranspiration is a natural process by which plant losses water. Thus being natural they do not results into any change in physico-chemical characteristics of water while effluents discharged into water bodies by industrial units and domestic sewage results in to change in physico-chemical characteristics like pH, conductivity, temperature, electrical conductivity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, NH 4 + and NO 3 - ion contents etc.

[#712] Sulphur dioxide present in the industrial chimney exhaust causes
Correct Answer

(D) All of the above

Explanation

Solution: Sulphur dioxide present in the industrial chimney exhaust causes respiratory and lung disease reduction in plant's productivity owing to acid rain and corrosion building materials.

[#713] Coating of solid waste with impervious material is known as
Correct Answer

(A) Encapsulation

Explanation

Solution: Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an inert and non-reactive impervious material (microencapsulation), and (ii) coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).

[#714] Taj Mahal is greatly affected due to :
Correct Answer

(B) Acid rain

Explanation

Solution: When sulphur pollutants fall on to buildings made from limestone and sandstone they react with minerals in the stone to form a powdery substance that can be washed away by rain. This is known as acid rain. Famous buildings like the Statue of Liberty in New York, the Taj Mahal in India and St. Paul's Cathedral in London have all been damaged by this sort of air pollution.

[#715] High concentration hydrocarbon pollutants in atmospheric air causes
Correct Answer

(A) Cancer

Explanation

Solution: High concentration hydrocarbon pollutants in atmospheric air causes cancer.