set 1 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) Greenhouse effect is responsible for global warming.
(b) Acid rain is mostly because of oxides of nitrogen and sulphur.
(c) Chlorofluorocarbons are responsible for ozone layer depletion.
(d) Ozone layer does not permit infrared radiation from the sun to reach the earth.
The correct answers to the above question in:
Answer: (d)
The ozone layer acts as a shield and does not allow ultraviolet radiation from the sun to reach earth.
It does not prevent infra-red radiation from the sun to reach earth, thus option (d) is the wrong statement and so it is the correct answer.
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
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 has a triatomic linear molecule
c) Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun
d) None of these
Answer »Answer: (c)
Question : 2
Green chemistry means such reactions which
a) reduce the use and production of hazardous chemicals
b) are related to the depletion of ozone layer
c) produce colour during reactions
d) study the reactions in plants
Answer »Answer: (a)
Green chemistry may be defined as the programme of developing new chemical products and chemical processes or making improvements in the already existing compounds and processes so as to make them less harmful to human health and the environment.
This means the same as reducing the use and production of hazardous chemicals. i.e. the correct answer is an option (a).
Question : 3
The statement which is not true:
a) SO3 is more harmful air pollutant than SO2
b) NO2 does not play any role in photochemical smog
c) SO2 does not affect larynx (voice box)
d) NO is more toxic to living tissues than NO2
Answer »Answer: (a)
SO3 is more harmful pollutant than SO2.
Question : 4
Match List-I with List-II :
List-I | List-II |
A. Insecticides | 1. Na3AsO3 |
B. Herbicides | 2. CuSO4 |
C. Fungicides | 3. Zn3P2 |
D. Rodenticides | 4. BHC |
a) A – 4, B – 2, C – 1, D – 3
b) A – 1, B – 4, C – 2, D – 3
c) A – 4, B – 1, C – 2, D – 3
d) A – 4, B – 1, C – 3, D – 2
Answer »Answer: (c)
Question : 5
The substance having the largest concentration in acid rain?
a) HNO3
b) HCl
c) H2CO3
d) H2SO4
Answer »Answer: (d)
Acid rain contains H2 SO4 > HNO3 > HCl.
Question : 6
BOD is connected with
a) organic matter
b) microbes
c) microbes and organic matter
d) None of these
Answer »Answer: (c)
BOD is connected with microbes and organic matter.
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