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) CO
(b) O2
(c) NO
(d) CO2
The correct answers to the above question in:
Answer: (c)
Haemoglobin has great affinity for NO.
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Question : 1
When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
a) slightly higher than that when the thunderstorm is not there
b) uninfluenced by occurrence of thunderstorm
c) slightly lower than that of rain water without thunderstorm
d) which depends upon the amount of dust in air
Answer »Answer: (c)
Normal rainwater has a pH of 5.6
Thunderstorm results in the formation of NO and HNO3 which lowers the pH.
Question : 2
The pollutants which came directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?
a) Hydrocarbon
b) Peroxyacetyl nitrate
c) CO
d) NO
Answer »Answer: (b)
Question : 3
Which of the following is not involved in the formation of photochemical smog?
a) NO
b) SO2
c) Hydrocarbon
d) O3
Answer »Answer: (b)
Photochemical smog does not involve SO2 .
Question : 4
Living in the atmosphere of CO is dangerous because it
a) Dries up the blood
b) Reduces organic matter of tissues
c) Combined with O2 present inside to form CO2
d) Combines with haemoglobin and makes it incapable of absorbing oxygen
Answer »Answer: (d)
When CO is not ventilated it binds to haemoglobin, which is the principal oxygen-carrying compound in blood; this produces a compound known as carboxyhaemoglobin.
The traditional belief is that carbon monoxide toxicity arises from the formation of carboxyhaemoglobin, which decreases the oxygen-carrying capacity of the blood and inhibits the transport, delivery, and utilization of oxygen by the body.
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
Which raw material is used in the preparation of soft glass ?
a) Na2CO3, SiO2, CaCO3
b) K2CO3, SiO2, PbCO3
c) K2CO3, Sio2, CaCO3
d) Na2CO3, SiO
Answer: (a)
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