Question
Consider following statements: (a) Chlorofluorocarbons are responsible for ozone layer depletion. (b) Green house effect is responsible for global warming. (c) Ozone layer does not permit infrared radiation from sun to reach the earth. (d) Acid rain is mostly because of oxides of nitrogen and sulphur. Correct statements are:
The correct answer is
(a), (b) and (d)
Statements (a), (b) and (d) are correct in the intended context. CFC-derived chlorine destroys stratospheric ozone; increased greenhouse gases enhance warming; sulfur and nitrogen oxides form acid rain. Statement (c) is false: ozone’s protective role is chiefly absorption of ultraviolet radiation.
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Important Questions from Air and Noise Pollution
- A possible mechanism for photochemical smog inhibition is to add compounds like diethylhydroxylamine (DEHA) as it reacts with
- In the determination of sulphur dioxide by p-rosaniline method, the end product is
- A point source of sound produces a noise of 70 dB at a distance of 20 m from it. What will be the noise level at 80 m from it ?
- Emission inventories involved in urban air quality assessment include parameters on
i. $SO_2$, $NO_x$, particulate matter pollutants
ii. Industry, traffic, domestic sources
iii. Fuel type, gasoline, wood as energy carrier
Choose the correct answer from codes given below : - Priority air pollutants included in the air quality index for urban areas in India are :
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