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Q 1. 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 2. Choose the biodegradable pollutant out of the following.
DDT
Cow dung
Alkyl benzene sulphonate
Mercury
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Q 3. 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 4. 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 5. 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 6. 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 7. 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 8. 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 9. 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 10. Environmental pollution affects:
biotic components
human beings only
plants only
biotic and abiotic components of environment
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Q 11. 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 12. 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 13. 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 14. The point of temperature inversion between troposphere and ionosphere is called
stratopause
mesopause
ionopause
tropopause