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) orlon
(b) teflon
(c) nylon
(d) Bakelite
The correct answers to the above question in:
Answer: (a)
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
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 : 2
Which of the following is the major cause of global warming?
a) re-radiation of I.R. rays by O2 and N2
b) re-radiation of I.R. rays by CO2 and H2O
c) re-radiation of U.V. rays by CO2 and H2O
d) re-radiation of U.V. rays by O2 and N2
Answer »Answer: (b)
Question : 3
Which one of the following substances is used in the manufacture of safety matches?
a) Phosphorus trioxide (P203)
b) White phosphorus
c) Red phosphorus
d) Black phosphorus
Answer »Answer: (c)
Question : 4
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 : 5
Which among the following statements is false?
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.
Answer »Answer: (c)
Oil slick in sea water decreases D.O value.
Question : 6
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)
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