Which of the following is responsible for depletion of the ozone

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Bio gas production is more useful when compared to the direct use of dung because

  • both fuel value and fertiliser value are effectively utilised

  • production of bio gas involves less labour

  • fuel is quickly produced

  • the fertiliser produced is a fluid


42.

In blast furnace, iron oxide is reduced by

  • hot blast of air

  • carbon monoxide

  • carbon

  • silica


43.

Use of chlorofluoro carbons is not encouraged because

  • they are harmful to the eyes of people that use it

  • they damage the refrigerators and air conditioners

  • they eat away the ozone in the atmosphere

  • they destroy the oxygen layer


44.

Conversion of oxygen into ozone is non-spontaneous at

  • all temperature

  • high temperature

  • room temperature

  • low temperature


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45.

Which one of the following is not a common component of photo-chemical smog?

  • Ozone

  • Acrolein

  • Peroxy acetyl nitrate

  • Chloroflourocarbons


46.

Producer gas is a mixture of:

  • CO and N2

  • CO2 and H2

  • N2 and O2

  • CH4 and N2


47.

The radiant energy from the sun is due to :

  • combustion

  • nuclear fusion

  • nuclear fission

  • chemical reaction


48.

The smog is essentially caused by the presence of

  • O2 and O3

  • O2 and N2

  • oxides of sulphur and nitrogen

  • O3 and N2


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49.

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere ?

  • Polyhalogens

  • Ferrocenes

  • Fullerenes

  • Freons


D.

Freons

Freons or chlorofluoro carbons are responsible for depletion of the ozone layer in the upper strata of the atmosphere. They are used as propellants, aerosol spray caps, refrigerents, fire fighting reagents etc. They are stable and chemically inert compounds. They absorb UV-radiation and break down liberating free atomic chlorine which causes decomposition of ozone through free radical reaction. This results in the depletion of the ozone layer.


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50.

Match the Column I and Column II and choose the correct code given below.
Column I Column II
A. Peroxyacetyl nitrile i. Waste incineration
B. Indigo ii. Vat dye
C. IR active molecules iii. Global warming
D. Dioxins iv. Photchemical smog

  • A - iv; B - ii; C - iii; D - i

  • A - i; B - ii; C - iv; D - iii

  • A - ii; B - i; C - iv; D - iii

  • A - iv; B - i; C - iii; D - ii


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