Which of the following is the coldest region?
(1) Troposphere
(2) Mesophere
(3) Stratosphere
(4) Thermosphere
(1) Troposphere
(2) Mesophere
(3) Stratosphere
(4) Thermosphere
The aromatic compound that is present as particulate among the following is :
1. Benzene
2. Toulene
3. Nitrobenzene
4. Polycyclic hydrocarbons
Which of the following is true about photochemical smog?
(1) It is reducing in nature
(2) It is formed in winter
(3) It is a mixture of smoke and fog
(4) It causes irritation in eyes
BOD, is
(1) Waste decomposed in 5 days
(2) Oxygen used in 5 days
(3) Microorganisms killed in 5 days
(4) Dissolved oxygen left after 5 days
Identify the wrong statement among the following.
(1) Chlorofluorocarbons are responsible for ozone layer depletion
(2) Green house effect is responsible for global warming
(3) Ozone layer does not permit infrared radiation from the sun to reach the earth
(4) Acid rain is mostly because of oxides of nitrogen and Sulphur
When rain is accompanied by a thunderstorm, the pH value of the collected rain water is :
1. Dependent upon the amount of dust in the air.
2. Slightly lower when rainwater is without a thunderstorm.
3. Slightly higher when the thunderstorm is not there.
4. Unaffected by the occurrence of thunderstorms.
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