- (A) Thermosphere
- (B) Troposphere
- (C) Stratosphere
- (D) None of these
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Latest MCQs
- (A) Automobile exhaust
- (B) Forest fire
- (C) Bacterial action in soil and swamp areas
- (D) All
- (A) Coal mining
- (B) Limestone mining
- (C) Textile
- (D) Asbestos
- (A) 1
- (B) 5
- (C) 10
- (D) 50
- (A) Calcium
- (B) Fluorine
- (C) Phosphorous
- (D) Sulphur
- (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
- (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.
- (E) into nitrogen compound form
- (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
- (A) 5
- (B) 50
- (C) 2000
- (D) 5000
- (A) 0.05
- (B) 1
- (C) 6.5
- (D) 15
