Tag: air and water pollution control

Questions Related to air and water pollution control

Which of the following is a set of green house gases?

chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. ${\text{C}}{{\text{H}} _4},\,{O _3},\,{{\text{N}} _2}S{O _2}$

  2. ${O _3},\,{{\text{N}} _2}C{O _2},\,N{O _2}$

  3. $\,{O _3},\,{\text{N}}{{\text{O}} _2}S{O _2},\,C{l _2}$

  4. ${\text{C}}{{\text{O}} _2}{\text{C}}{{\text{H}} _{4,}}{N _2}O,\,{O _3}$

Show answer
Correct Option: C

Select the correct statements about greenhouse gases:


A. Carbon dioxide is the only gas in the atmosphere which causes global warming.
B. The greenhouse gases trap heat and do not allow heat to escape into outer space.
C. Water vapours do not contribute to the greenhouse effect.
D. The presence of excessive greenhouse gases in the atmosphere is responsible for global warming.

chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. A and B

  2. B and D

  3. C and B

  4. D and A

Show answer
Correct Option: B
Explanation:

The primary green house gases in earth's atmosphere are water vapour, $CO _2$, $CH _4$, $N _2O$, $O _3$, $CFC$ etc. Thus $CO _2$ is not the only green house gas and water vapours also contribute to global warming.

What is the cause of Green house effect?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. Infrared rays

  2. Ultraviolet rays

  3. X-rays

  4. Radio waves

Show answer
Correct Option: A
Explanation:

Sun gives out UV, infrared and visible radiation gets received by the earth. The incoming solar energy from the sun is redirected back towards space by the atmosphere and clouds and then some of the solar energy gets absorbed by the atmosphere and clouds. And the remaining energy gets absorbed by the Earth’s surface making it warm. This energy then gets converted into heat.

Now once this heat gets absorbed by the earth’s surface, it is trapped in the earth’s atmosphere and thereby adding to increase the earth’s temperature. This effect is what we call the ‘Greenhouse Effect’.

 Thus, Infrared rays are the cause of the Greenhouse effect.

Hence, the correct option is $A$

Green house effect is caused by :

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $NO _2$

  2. $CO$

  3. $NO$

  4. $CO _2$

Show answer
Correct Option: D
Explanation:
The man-made component of the greenhouse effect is caused by man’s activities that emit greenhouse gases to the atmosphere. The most important of these is the burning of fossil fuels. Fossil fuels contain carbon, and when they are burnt this carbon combines with oxygen in the atmosphere to form carbon dioxide.

So, the greenhouse effect is caused by $CO _2$.

The earth gives up .......... energy into atmosphere.

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. light

  2. heat

  3. chemical

  4. wind

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Correct Option: B
Explanation:

Heat radiations from the sun are absorbed by the earth's surface and are reflected back to the atmosphere which is the cause of greenhouse effect.

Which of the following statements is not true?

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $CO _2$ is the best fire extinguisher

  2. Global warming can cause acid rain

  3. Burning of coal and diesel releases sulphur dioxide gas

  4. LPG has higher calorific value than biogas

Show answer
Correct Option: B
Explanation:

Global warming may cause glaciers to melt, which may lead to the rise in sea level and submerge low-lying areas but does not cause acid rain.

Greenhouse effect causes:

chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. melting of ice caps

  2. rise in the sea level

  3. submerging of low lying areas

  4. All of the above

Show answer
Correct Option: A
Explanation:

The greenhouse effect causes the melting of the ice caps and releases other greenhouse gases, $CH _4$ which is heating up the environment and causing the greenhouse effect again. 

Option A is correct.

Global warming causes:
1) an increase in the sea level
2) the melting of ice at mountain peaks
3) a decrease in food production by plants

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. I only

  2. I and II only

  3. II and III only

  4. I, II and III

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Correct Option: D
Explanation:

The global warming effect causes the rise in the global temperature resulting in melting of polar ice caps and rise in sea level.This rise in temperature changes the rain cycle and it decreases the crop production.

The release of carbon dioxide into the air causes:

biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. acid rain

  2. eutrophication

  3. global warming

  4. respiratory problems

Show answer
Correct Option: C
Explanation:

The trapping of infrared radiations from the atmosphere and not reflecting it back due to higher levels of Carbon dioxide as a major pollutant which traps radiations. This effect causes the rise in the global temperature resulting in melting of polar ice caps and rises in the sea level.

Gases referred as 'greenhouse gases' are:

chemistry air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

  1. $CO _2,\ O _2,\ NO _2,\ NH _3$

  2. chlorofluorocarbon, $CO _2,\ NH _3,\ N _2O$

  3. $CH _4,\ N _2,\ CO _2,\ NH _3$

  4. chlorofluorocarbon, $CO _2,\ CH _4,\ N _2O$

Show answer
Correct Option: D
Explanation:

The most significant greenhouse gases are water vapour (H$ _2$O), carbon dioxide (CO$ _2$), methane (CH$ _4$) and nitrous oxide (N$ _2$O). Chlorofluorocarbons (CFCs), once used as refrigerants and aerosol propellants until they were phased out by international agreement, are also greenhouse gases.