101. The statement which is not correct about control of particulate pollution :
A
In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed.
B
Gravity settling chamber removes larger particles from the air.
C
Cyclone collector removes fine particles in the diameter range 5-20 microns.
D
Wet scrubbers are used to wash away all types of particulates.
Answer :
In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed.
102.
Study the given diagram and answer the following question.
Which is the most appropriate statement about the figure?
A
The highly persistant toxins are transferred from higher trophic level to lower trophic level.
B
At each tropic level the pollutants get approximately 10 times concentrated.
C
The level of pollutants is maximum at molecular level and minimum in human beings.
D
Repeated use of toxins reduces its concentration at highest level.
Answer :
At each tropic level the pollutants get approximately 10 times concentrated.
103. Mark the example which is not correctly matched?
A
Air pollutants - Oxides of sulphur, nitrogen and carbon
B
Particulate pollutants - Dust, mist, fumes
C
Global warming - Methane, ozone, $$CFCs$$
D
Water soluble chemical pollutants - Oxides of nitrogen, carbon and sodium.
Answer :
Water soluble chemical pollutants - Oxides of nitrogen, carbon and sodium.
104. What is the concentration of dissolved oxygen in cold water ?
A
5$$\,ppm$$
B
10$$\,ppm$$
C
200,000$$\,ppm$$
D
100$$\,ppm$$
Answer :
10$$\,ppm$$
105. Which of the following processes is not responsible for adding particulates to the atmosphere?
A
Photosynthesis
B
Combustion of fuels
C
Industrial processes
D
Agricultural processes
Answer :
Photosynthesis
106. In a coal fired power plant, electrostatic precipitators are installed to control emission of
A
$$S{O_2}$$
B
$$N{O_x}$$
C
$$SPM$$
D
$$CO$$
Answer :
$$SPM$$
107.
Which of the following statement$$(s)$$ is/are true about waste recycling ?
(i) Clothes can be made from recycled plastic waste.
(ii) Fuel that has high octane rating and contains no lead can be obtained from plastic waste.
(iii) Technology has now been developed to produce electricity from the garbage.
A
(ii) only
B
(ii) and (iii)
C
(iii) only
D
All of these
Answer :
All of these
108. Sulphur oxides which are responsible for major air pollution are caused by
A
burning of coal and refining of petroleum
B
burning of fuels in automobiles
C
combustion of fuels containing $$C$$ and $$H$$
D
using indoor combustion devices like cooking gas
Answer :
burning of coal and refining of petroleum
109. Which one of the following statement is not true ?
A
$$pH$$ of drinking water should be between 5.5 - 9.5.
B
Concentration of $$DO$$ below $$6\,ppm$$ is good for the growth of fish.
C
Clean water would have a $$BOD$$ value of less than $$5\,ppm.$$
D
Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
Answer :
Concentration of $$DO$$ below $$6\,ppm$$ is good for the growth of fish.
110. Mark the incorrect choice of ill effects caused by the pollutant.
A
Lead - Kidney, liver, reproductive system
B
Fluoride - Bones and teeth
C
Nitrate - Blue baby's syndrome
D
Sulphates - Brown mottling of teeth
Answer :
Sulphates - Brown mottling of teeth