10
MCQ (Single Correct Answer)
The pollutants which come 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
CO
B
Hydrocarbon
C
Peroxyacetyl nitrate
D
NO
11
MCQ (Single Correct Answer)
Which of the following statements is correct?
A
Ozone hole is a hole formed in stratosphere from which ozone oozes out
B
Ozone hole is a hole formed in troposphere from which ozone oozes out
C
Ozone hole is thinning of ozone layer of stratosphere at some places
D
Ozone hole means vanishing of ozone layer around the earth completely
12
MCQ (Single Correct Answer)
Which of the following practices will not come under green chemistry?
A
If possible, making use of soap made of vegetable oils instead of using synthetic detergents
B
Using $\mathrm{H}_2 \mathrm{O}_2$ for bleaching purpose instead of using chlorine based bleaching agents
C
Using bicycle for travelling small distances instead of using petrol/ diesel based vehicles
D
Using plastic cans for neatly storing substances
13
MCQ (Multiple Correct Answer)
Which of the following conditions shows the polluted environment?
A
pH of rain water is 5.6
B
Amount of carbon dioxide in the atmosphere is $0.03 \%$
C
Biochemical oxygen demand 10 ppm
D
Eutrophication
14
MCQ (Multiple Correct Answer)
Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes ............... .
A
enhanced growth of algae
B
decrease in amount of dissolved oxygen in water
C
deposition of calcium phosphate
D
increase in fish population