Tag: air and water pollution

Questions Related to air and water pollution

The quantity of $CO _{2}$ in atmosphere can be decreased by :

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. Rain

  2. Forests

  3. Vegetation

  4. All of the above 

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Correct Option: D
Explanation:

Plants play a very important part in reducing the amount of $CO _2$ in atmosphere, plants use $CO _2$ to make food and release oxygen, during rain, water get reacted with $CO _2$ in the atmosphere and form $H _2CO _3$ and hence reduce the amount of $CO _2$ in the atmosphere.

Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of __________ .

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. carbon Monoxide and water vapour

  2. carbon monoxide

  3. nitrogen dioxide

  4. sulphur dioxide

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Correct Option: B
Explanation:

The incomplete combustion of petrol and diesel in automobile produces carbon monoxide.

Modes of controlling pollution in large cities include(s):

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. less use of insecticides

  2. proper disposal of organic wastes, sewage and industrial effluents

  3. shifting of factories out of the residential area

  4. all the above

Show answer
Correct Option: D
Explanation:

In large cities, environmental health can be maintained by decreased use of insecticides as it affects air quality. All types of household and industrial waste should be handled and disposed of out of the city area and factories inside the residential areas cause great harm to health by polluting the air and water by its wastes, so they must be shifted outside the residential area.


Hence, the correct option is $\text{D}$

How can we save the environment from degradation by reducing the number of fossil fuels to be burned?

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. By using public mode of transportation

  2. By conserving energy

  3. By using efficient device

  4. All of these

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Correct Option: D
Explanation:

We can save the environment from degradation by reducing the amount of fossil fuels to be burned:

  • By using public mode of transportation
  • By conserving energy
  • By using efficient device

Widespread use of catalytic convertors in cars has significantly reduced_____emissions.

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. $HNO _3$

  2. $H _2S$

  3. $CO$

  4. $CH _4$

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Correct Option: C
Explanation:

As with many direct and indirect greenhouse gases, reductions in carbon monoxide emissions can most effectively be made through direct reductions in fossil fuel use. There is some evidence that the widespread use of catalytic convertors in cars has significantly reduced carbon monoxide emissions from this source. 

Which of the following pose threat to historical monument Taj Mahal?

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. Floods in Yanuna river

  2. Temperature mediated spoilage of marble

  3. Air pollutants from Mathura refinery

  4. Weathering of marble

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Correct Option: C
Explanation:

The Mathura Refinery, owned by Indian Oil Corporation, is located in Mathura, Uttar Pradesh. The Mathura oil refinery releases toxic gases and disposes waste into the rivers making the area dirty and unhealthy. Even the Taj Mahal is getting affected because of this. The India government hired a panel to examine the effects of the refinery on the Taj Mahal. The panel found that the air has high levels of suspended particulate matter, caused by factory emissions, dust, construction, and exhaust from automobiles. These are causing the Taj Mahal to change colour.

Ozone layer of stratosphere requires protection from indiscriminate use of:

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. fungicides, insecticides, bactericides and medicines

  2. aerosols and high flying jets

  3. atomic explosions and industrial wastes

  4. weather balloons

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Correct Option: B
Explanation:

Aerosols are minute particles suspended in the atmosphere. When these particles are sufficiently large, we notice their presence as they scatter and absorb sunlight. Their scattering of sunlight can reduce visibility (haze) and redden sunrises and sunsets. Aerosols also can act as sites for chemical reactions to take place. The most significant of these reactions are those that lead to the destruction of stratospheric ozone. During winter in the Polar Regions, aerosols grow to form polar stratospheric clouds. The large surface areas of these cloud particles provide sites for chemical reactions to take place. These reactions lead to the formation of large amounts of reactive chlorine and, ultimately, to the destruction of ozone in the stratosphere

The pollutants released by jet aeroplanes inthe atomsphere as fluorocarbons are called:

chemistry air and water pollution ways to prevent air pollution ways to reduce air pollution reducing air pollution

  1. photochemical oxidants

  2. photochemical reductants

  3. aerosols

  4. physical pollutants

Show answer
Correct Option: C
Explanation:

Aerosols are emitted into the air in the form of vapour or fine mist. Jet airplanes emit aerosols containing chlorofluorocarbons $(CCl _{2}F _2)$ and $(CCl _3F)$. The aerosols deplete ozone layer in the atmosphere.