Question 1

Snow blindness is cause due to

Accepted Answer

Cataracts and blindness are among the most common eye diseases associated with further ozone layer depletion and increased UV-B at the Earth's surface.  A 1% decrease in stratospheric ozone may result in 100,000 to 150,000 additional cases of blindness due to eye cataracts worldwide. The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the Earth's atmosphere.So the correct answer is 'Ozone hole'.

Question 2

Depletion of ozone layer is due to _______.

Accepted Answer

Oxides of nitrogen find their way to the environment when they are released from the fertilizers, farms, combustion of coal etc. These bear a similarity to the paraffinated halogens like the chlorofluorocarbons when they reach the stratosphere of the atmosphere. They get unstable when exposed to the UV rays and the reactive nitrogen atom recs with the ozone to form the nitrogen dioxide and the diatomic oxygen molecule, similar to the reaction catalysed by the CFCs which release reactive chlorine that break down the ozone.Hence, the correct answer is 'Oxides of nitrogen'.

Question 3

The combination of nitrogen oxides and hydrocarbons in the presence of the sunlight causes

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Question 4

Which of the following is the uppermost layer of the atmosphere?

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Question 5

CFCs split up in stratosphere to release chlorine by the action of

Accepted Answer

The UV-C radiations breakdown the bonds in the chlorofluorocarbons (CFCs) to release the chlorine monoxide and the nascent chlorine. These further react with the ozone to split it into ordinary oxygen molecules. The oxygen molecules are further broken down into nascent oxygen, which acts as the radicle. Hence, the correct answer is 'UV-C'.

Question 6

Chlorofluorocarbon releases ______ which is harmful to ozone.

Accepted Answer

Chlorofluorocarbons are the halogenated paraffin hydrocarbons containing chlorine, fluorine and carbon. These have been extensively used as the refrigerants and the spray propellants due to their non-toxic nature. But, the CFCs have found their way to the stratosphere of the atmosphere where the incidence of the UV rays is very high. The CFC splits up when exposed to the UV rays and release the reactive chlorine species. This is harmful to the ozone in the stratosphere because the chlorine reacts with ozone to release the simple oxygen, that is further converted to the reactive nascent oxygen.Hence, the correct answer is 'Chlorine'.

Question 7

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Accepted Answer

UV radiation causes the photodissociation of the CFCs, HFCs, methyl bromine etc. to release the reactive chlorine and bromine radicals. These reactive species then react with the ozone to release diatomic oxygen and molecular oxygen. The concentration of the ozone decreases and it is called the ozone hole.Ozone hole does not release in the global warming and climate change. These are caused by greenhouse gases. Ozone hole causes an increase in the infiltration of the UV to the earth's surface. Hence, the correct answer is 'Both Assertion and Reason are incorrect'

Question 8

Match the columns and find out the correct combination.IIIaDDTi.Co,  CO_2 bPANii.SmogcAcid rainiii.Biological magnificationdGlobal warmingiv. SO_2

Accepted Answer

I  II a DDT iii Biological magnification b PAN ii Smog c Acid Rain iv SO _{2}  d Global Warming i CO, CO _{2} a. DDT is the organochlorine that was used as the insecticide. It is insoluble in water but shows persistence in the adipose tissues of the living organisms due to which it keeps in accumulating at the successive trophic level in the food chain. This accumulation is called the biological accumulation.b. Peroxyacetylnitrate (PAN) is the secondary pollutant that causes the formation of smog in the presence of sunlight,c. Acid rain the result of the reaction between the oxides of nitrogen and sulphur with the water to form the respective acids and precipitate in the form of acid rain.d. Global warming is the increase in the temperature of the earth due to the trapping of the long-wave infra-red radiations by the gases like CO, CO _{2} . This is called the greenhouse effect.Hence, the correct answer is 'a-iii, b-ii, c-iv, d-i'.

Question 9

Depletion of ozone layer published in scientific journals, in

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Question 10

Choose the false statements out of the following and rewrite them correctly.Tropopause exists at a height of about  11  km.

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	I		II
a	DDT	i.	Co, $C O_{2}$
b	PAN	ii.	Smog
c	Acid rain	iii.	Biological magnification
d	Global warming	iv.	$S O_{2}$

Important questions on Atmospheric Pollution

Snow blindness is cause due to

Ozone hole

Nuclear winter

Acid rain

Green house effect

Depletion of ozone layer is due to _______.

Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

The combination of nitrogen oxides and hydrocarbons in the presence of the sunlight causes

Global warming

Smog

Ozone hole in the atmosphere

Acid rain

Which of the following is the uppermost layer of the atmosphere?

Stratosphere

Mesosphere

Ionosphere

Exosphere

CFCs split up in stratosphere to release chlorine by the action of

UV - A

UV - B

UV - C

All of the above

Chlorofluorocarbon releases ______ which is harmful to ozone.

Fluorine

Chlorine

Nitrogen peroxide

Sulphur dioxide

UV radiation cause photo dissociation of ozone into O2​ and O thus causing damage to stratospheric ozone layer.

Ozone hole is resulting in global warming and climatic change.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Assertion is correct but Reason is incorrect.

Both Assertion and Reason are incorrect.

Match the columns and find out the correct combination. IIIaDDTi.Co, CO2​bPANii.SmogcAcid rainiii.Biological magnificationdGlobal warmingiv.SO2​

a-iv, b-iii, c-ii, d-i

a-i, b-iii, c-ii, d-iv

a-ii, b-iii, c-iv, d-i

a-iii, b-ii, c-iv, d-i

a-iii, b-iv, c-i, d-ii

Depletion of ozone layer published in scientific journals, in

1950s

1990s

1970s

1980s

More important questions

UV radiation cause photo dissociation of ozone into $O_{2}$ and O thus causing damage to stratospheric ozone layer.

Match the columns and find out the correct combination.

I II
a DDT i. Co, $C O_{2}$
b PAN ii. Smog
c Acid rain iii. Biological magnification
d Global warming iv. $S O_{2}$