Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?
(A) CO2
(B) SO2
(C) Hydrocarbons
(D) CFC (chloro fluoro carbon)
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?
(A) Thermosphere
(B) Troposphere
(C) Stratosphere
(D) None of these
Which of the following is a manmade source of air pollution ?
(A) Automobile exhaust
(B) Forest fire
(C) Bacterial action in soil and swamp areas
(D) All
Workers working in _______________ industry are most prone to white lung cancer?
(A) Coal mining
(B) Limestone mining
(C) Textile
(D) Asbestos
The weakest sound that can be heard by a person in a quiet environment is equivalent to ____________ decibel ?
(A) 1
(B) 5
(C) 10
(D) 50
______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
(A) Calcium
(B) Fluorine
(C) Phosphorous
(D) Sulphur
Pick out the wrong statement?
(A) Loamy soil is the best soil for vigorous plant growth, while the clayey soil is solid and hence the plant roots penetrate with difficulty
(B) Large excess use of nitrogenous fertiliser in land causes the problem of diarrhoea and cyanosis
(C) Application of large excess of Potassic fertiliser in soil increases the valuable carotene in fruits and vegetables
(D) Cereal crops grown on alkaline soil absorb higher amount of fluorides thereby spreading fluorosis
Pick out the wrong statement?
(A) Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water
(B) Apatite is the principal material present in phosphate rock which is chemically Ca10 (PO4)6 (F, Cl, OH)
(C) Urea is more hygroscopic than ammonium nitrate
(D) Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.
(D) into nitrogen compound form
Pick out the wrong statement?
(A) Dehydration of ammonium carbamate to produce urea is endothermic
(B) Direct use of liquid ammonia as a fertiliser for a tropical country like India is suitable
(C) Gypsum (CaSO4. 2H2O) is obtained as a by-product in the wet process for manufacture of ortho-phosphoric acid
(D) Phosphate rock when reacted with dilute H2SO4 produces superphosphate