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Q 1. Identify the incorrect statement from the following.
Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer
Ozone absorbs infrared radiation
Depletion of ozone layer is because of its chemical reactions with chlorofluoroalkanes
Ozone absorbs the intense ultraviolet radiation of the sunlight
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Q 2. Phosphate pollution is caused by
Sewage and agricultural fertilizers
Agricultural fertilizers only
Phosphate rocks and sewage
Weathering of phosphate rocks only
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Q 3. Which one of the following dissolves more rapidly in haemoglobin than oxygen?
Ozone
{tex} \mathrm { SO } _ { 2 } {/tex}
{tex} \mathrm { N } _ { 2 } \mathrm { O } {/tex}
{tex} \mathrm { CO } {/tex}
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Q 4. The greenhouse effect is caused by
{tex} \mathrm { CO } {/tex}
{tex} \mathrm { NO } _ { 2 } {/tex}
{tex} \mathrm { NO } {/tex}
{tex} \mathrm { CO } _ { 2 } {/tex}
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Q 5. Formation of ozone in the upper atmosphere from oxygen takes place by the action of
Nitrogen oxides
Ultraviolet rays
Cosmic rays
Free radicals
Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules, which make up 21% of the atmosphere. In the first step, solar ultraviolet radiation breaks apart one oxygen molecule ({tex}\mathrm{O_2}{/tex}) to produce two oxygen atoms
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Q 6. The chemical entities present in thermosphere of the atmosphere are
{tex} \mathrm { O } ^ { + 2 } , \mathrm { O } ^ { + } , \mathrm { NO } ^ { + } {/tex}
{tex} \mathrm { O } _ { 3 } {/tex}
{tex} \mathrm { N } _ { 2 } , \mathrm { O } _ { 2 } , \mathrm { CO } _ { 2 } , \mathrm { H } _ { 2 } \mathrm { O } {/tex}
{tex} \mathrm { O }_ 3 , \mathrm { O } _ { 2 } ^ { + } , \mathrm { O } _ { 2 } {/tex}
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Q 7. Persistent pesticides such as DDT pass into food chain and increase in amount per unit weight of organism due to their accumulation in fat. This phenomenon is called
biomagnification
biodegradation
biosynthesis
decomposition
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Q 8. Fluorosis, the bone disease, is caused by the presence of:
pesticides in water
fluorides in water
carbon monoxide in air
sulphur dioxide in air
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Q 9. The point of temperature inversion between troposphere and ionosphere is called
stratopause
mesopause
ionopause
tropopause
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Q 10. Which of the following is a primary pollutant?
PAN
{tex} \mathrm { CO } {/tex}
Aldehydes
{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}
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Q 11. Choose the biodegradable pollutant out of the following.
DDT
Cow dung
Alkyl benzene sulphonate
Mercury
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Q 12. The type of pollution caused by spraying of DDT
Air, water, and soil
Air and water
Air
Air and soil
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Q 13. Water pollution is caused by
Aeroplanes
Fly ash
Auto exhaust
Pesticides
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Q 14. Which of the following is not a consequence of greenhouse effect?
Climatic conditions will be changed
Plants in warmer climates with adequate rainfall would grow faster
The incidence of infectious diseases is likely to increase
Malaria will be controlled as the mosquitoes will not survive
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Q 15. What is not correct about greenhouse effect?
It results in global warming.
{tex} \mathrm { CO } _ { 2 } {/tex} is one of the main chemical species responsible for it.
It results in lowering of levels of ocean over the years.
{tex} \mathrm { CH } _ { 4 } , \mathrm { O } _ { 3 } , \mathrm { CFC } {/tex} also contribute to greenhouse effect.
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Q 16. Environmental pollution affects:
biotic components
human beings only
plants only
biotic and abiotic components of environment
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Q 17. Negative soil pollutant is
converting fertile land into barren land by dumping ash, sludge, and garbage
reduction in soil productivity due to addition of pesticides and industrial wastes
reduction in soil productivity due to erosion and over use
None of the above
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Q 18. Which of the following is the coldest region of atmosphere?
Thermosphere
Troposphere
Mesosphere
Stratosphere
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Q 19. The biggest particulate matter is
{tex} \mathrm { HNO } _ { 3 } {/tex} droplets
Fly ash
{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} droplets
Soot
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Q 20. Which of the following statements about polar stratosphere clouds (PSCs) is not correct?
PSCs do not react with chlorine nitrate and HCl
Type I clouds are formed at about {tex} - 77 ^ { \circ } \mathrm { C } {/tex} and contain solid {tex} \mathrm { HNO } _ { 3 }\cdot3 \mathrm { H } _ { 2 } \mathrm { O } {/tex}
Type II clouds are formed at about {tex} - 85 ^ { \circ } \mathrm { C } {/tex} and contain some ice
A tight whirlpool of wind called polar vortex is formed which surrounds Antarctica
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Q 21. Which forms the part of hazy fumes of photochemical smog?
{tex} \mathrm { SO } _ { 2 } {/tex}
Aldehydes
PAN formation
Nitrogen dioxide