set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on environmental chemistry topic of general science mcq
(a) The main reason for river water pollution is industrial and domestic sewage discharge.
(b) Surface water contains a lot of organic matter mineral nutrients and radioactive materials.
(c) Oil slick in sea water increases D.O. value.
(d) Oil spill in sea water causes heavy damage to fishery.
The correct answers to the above question in:
Answer: (c)
Oil slick in sea water decreases D.O value.
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
Which of the following statements about polar stratosphere clouds (PSCs) is not correct?
a) Type I clouds are formed at about –77ºC and contain solid HNO3 . 3H2O
b) PSCs do not react with chlorine nitrate and HCl
c) Type II clouds are formed at about –85ºC and contain some ice
d) A tight whirlpool of wind called Polar Vortex is formed which surrounds Antarctica
Answer »Answer: (b)
PSCs react with chlorine nitrate and HCl to give HOCl and Cl2.
Question : 2
The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc., is
a) orlon
b) teflon
c) nylon
d) Bakelite
Answer »Answer: (a)
Question : 3
Which of the following substances is/are ozone depleting?
- Chlorofluorocarbons
- Halons
- Carbon tetrachloride
a) 1 and 2
b) 1 only
c) 2 and 3
d) 1, 2 and 3
Answer »Answer: (d)
All three substances are responsible for ozone layer depletion in different ways. Which are:
CFC - is mostly used in refrigeration, air conditioning and heat pump systems.
Halons - used historically as fire suppression agents and fire fighting, but now only allowed in very limited situations.
Carbon tetrachloride (tetrachloromethane) - limited solvent use in laboratories and chemical and pharmaceutical industries.
Question : 4
Some statements about the benefits of organic farming are given below. Indicate whether they are true or false using the codes given below the statements :
- It reduces CO2 emissions.
- It does not lead to toxic effects.
- It improves the water-retention capacity of the soil.
a) False - True - True
b) True - False - False
c) False - True - False
d) False - True - True
Answer »Answer: (a)
Question : 5
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of
a) increase in the amount of dissolved oxygen
b) decrease in the amount of dissolved oxygen in water
c) large number of mosquitoes
d) clogging of gills by mud
Answer »Answer: (b)
Question : 6
Which one of the following statements about ozone and ozone layer is true?
a) The conversion of ozone to oxygen is an endothermic reaction
b) Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun
c) Ozone has a triatomic linear molecule
d) None
Answer »Answer: (b)
Statement (a) is correct.
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