Tag: geobiochemical cycle

Questions Related to geobiochemical cycle

Which of the following is not a greenhouse gas?

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

  1. Carbon dioxide

  2. Sulphur dioxide

  3. Methane

  4. Nitrogen

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Correct Option: D
Explanation:

Greenhouse gases present in the atmosphere trap the radiations and do not allow heat to leave. Examples of greenhouse gases include carbon dioxide, methane, sulphur dioxide.

Increased level of greenhouse gases causes global warming which will result in:

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

  1. biomagnification

  2. eutrophication

  3. melting of glaciers

  4. ozone depletion

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Correct Option: C
Explanation:

The earth's atmosphere traps the heat from the sun, preventing it from escaping into space is the greenhouse effect. This is mainly caused by deforestation. This results in an increase in average temperature of the atmosphere due to which glaciers start melting and there is a rise in sea level. 

Few pollutants and their effects are listed below.
Mark the incorrect match.

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

  1. Phosphate fertilizers in water - Eutrophication

  2. Hydrogen released in air - Global warming

  3. Sewage disposed in water - Increase in BOD level

  4. Carbon dioxide in air - Acid rain

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Correct Option: B
Explanation:

Global warming occurs when gases like carbon dioxide and other greenhouse gases in the atmosphere absorb sunlight and solar radiation. They trap the heat and increase the temperature on the earth's surface. 

Which of the following is not a refrigerant?

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

  1. $CHClF _{2}$

  2. $NH _{3}$

  3. $Ether$

  4. $C _{2}H _{4}$

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Correct Option: D
Explanation:

Ethene is a colorless flammable gas with a faint "sweet and musky" odor when pure.
Ethylene is widely used in chemical industry. Ethylene is also an important natural plant hormone, used in agriculture to force the ripening of fruits. it is a non refrigerant.

The progressive warming up of the earth's surface is mainly due to :

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

  1. automobile exhaust

  2. blanketing effect of carbon dioxide in atmosphere

  3. reforestation

  4. thickening of ozone layer

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Correct Option: B
Explanation:

$CO _2$ goes in the atmosphere and make a thick layer, this layer allowes the light to enter into the atmosphere but do not allow it to exit, the heat get trapped into the atmosphere and leads to the warming up of the surface.

Widely distributed hydrocarbon in the atmosphere of earth is :

chemistry natural resources- air, water and land environmental impact: global warming green house effect geobiochemical cycle

  1. Butane

  2. Methane

  3. Smog

  4. PAN

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Correct Option: B
Explanation:

Methane is by far the most abundant hydrocarbon constituting about 40 to 80 % of total hydrocarbons present in the urban atmosphere.

 
Hydrocarbons predominate among the atmospheric pollutants because of their widespread use in fuels.

Therefore, option B is correct.

Green house effect of global warming causes:

chemistry natural resources- air, water and land environmental impact: global warming green house effect geobiochemical cycle

  1. rise in temperature of earth

  2. rise in pressure on earth

  3. decrease in oxygen content earths atmosphere

  4. decrease in $CO _{2}$ content

Show answer
Correct Option: A
Explanation:
A greenhouse gas is any gaseous compound in the atmosphere that is capable of absorbing infrared radiation, thereby trapping and holding heat in the atmosphere.

The progressive heating up of surface of the earth is earth is called green house effect or global warming.

CO$ _2$ and H$ _2$O block a part of the heat (IR) emitted by the earth & reflect back. Due to this earth surface gets heated up.
50% in CO$ _2$ content of air can increase the surface temperature of the earth by 3$^o$ C.
In addition to CO$ _2$ , the other green - house gases are CFCs (17%), O$ _3$ (18%), NO (4%), water vapour (2%).

Thus, the correct answer is option A. 

Global warming is due to greenhouse effect. The greenhouse gas include:

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

  1. $CO _2$

  2. Oxides of nitrogen

  3. Both a & b

  4. None of the above

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Correct Option: A
Explanation:

Global warming is due to Green Effect due to increase in the concentration of $CO _2$ by human activities like burning fossil fuels.

( Global warming in the overall temperature of the Earth's atmosphere due to the greenhouse effect caused by the increased levels of $CO _2,CFCs$ and other pollutants. )

Green house effect can be reduced by:

chemistry natural resources- air, water and land environmental impact: global warming green house effect geobiochemical cycle

  1. growing trees and forests

  2. use of faulty refrigerators

  3. burning of fossil fuels

  4. the use of natural gas

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Correct Option: A
Explanation:

By growing trees and foresets, we can reduce level of carbon dioxide in atmosphere so we can reduce green house effect.

If $CCl _{3}$F is present in the stratosphere, it will react with which of the following:
A) Ozone    B) $N _{2}$     C)$CO _{2}$

chemistry natural resources- air, water and land environmental impact: global warming green house effect geobiochemical cycle

  1. A

  2. B

  3. A & B

  4. C & A

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Correct Option: A
Explanation:

Chlorofluorocarbon causes depletion of ozone, so, $CCl _{3}F$ will react with ozone in the stratosphere.