Fish die in water bodies polluted by sewage due to
Options
(a) pathogens (b) Clogging of gills (c) Decreases in D.O (d) Foul smell
Correct Answer:
Decreases in D.O
Explanation:
Microorganisms from sewage consume […]
Surface water contains
Options
(a) salt + organic matter (b) only salt (c) organic matter (d) suspended impurity
Correct Answer:
salt + organic matter
Explanation:
Surface water contains salt and organic matter.
Addition of phosphate fertilizers into water leads to
Options
(a) increased growth of decomposers (b) reduced algal growth (c) increased algal growth (d) nutrient enrichment(eutrophication)
Correct Answer:
nutrient enrichment(eutrophication)
Explanation:
No explanation available. […]
Atmosphere of big/metropolitan cities is polluted most by
Options
(a) automobile exhausts (b) pesticide residue (c) household waste (d) radioactive fall out
Correct Answer:
automobile exhausts
Explanation:
Atmosphere of big cities is polluted most […]
The basic component of photochemical smog is
Options
(a) PBN (b) PAN (c) SO₂ (d) all of these
Correct Answer:
PAN
Explanation:
No explanation available. Be the first to write the explanation for […]
Biochemical oxygen Demand ,(BOD) is a measure of organic material present in water.BOD value less than 5 ppm indicates a water sample to be
Options
(a) rich in dissolved oxygen (b) poor in […]
Which of the following practices will not come under green chemistry
Options
(a) If possible,making use of soap made of vegetable oils instead of using synthetic detergents (b) using H₂O₂ for bleaching purpose […]
Which of the following statements is incorrect
Options
(a) Textile workers suffer from white lung disease (b) Coal miners suffer from black lung disease (c) Beryllium compounds (BeCl₂) cause beryllosis (d) Asbestos causes […]
Which of the following is the coldest region
Options
(a) Troposphere (b) Mesosphere (c) Stratosphere (d) Thermosphere
Correct Answer:
Mesosphere
Explanation:
No explanation available. Be the first to write the explanation for this […]
Classical smong is found in
Options
(a) winter during morning time (b) winter during day time (c) summer during day time (d) summer during morning time
Correct Answer:
winter during morning time
Explanation: […]
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