Tag: ways to reduce air pollution

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

Ozone hole is maximum spread over:

  1. Europe

  2. Antartica

  3. India

  4. Africa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ozone hole is caused by the effect of pollutants in the atmosphere destroying stratospheric ozone. During the Antarctic winter something special happens to the Antarctic weather.

Firstly, strong circular winds form that blow around the whole continent, this is known as the "polar vortex" -  this isolates the air over Antarctica from the rest of the world.

Secondly, special clouds form called Polar Stratospheric Clouds. Clouds don't normally form in the stratosphere and these turn out to have the effect of concentrating the pollutants that break down the ozone, so speeding the process up.

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

Photochemical smog is related to pollution of:

  1. Soil

  2. Air

  3. Water

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photochemical smog is produced when pollutants from the combustion of fossil fuels react with sunlight. The energy in the sunlight converts the pollutants into other toxic chemicals. For photochemical smog to form, there must be other pollutants in the air, specifically nitrous oxides and other volatile organic compounds (VOCs).

Hence, the correct option is $A$

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

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

  1. Rain

  2. Forests

  3. Vegetation

  4. All of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. carbon Monoxide and water vapour

  2. carbon monoxide

  3. nitrogen dioxide

  4. sulphur dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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 $\text{D}$

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

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

  1. By using public mode of transportation

  2. By conserving energy

  3. By using efficient device

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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

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

Widespread use of catalytic convertors in cars has significantly reduced_____emissions.

  1. $HNO _3$
  2. $H _2S$
  3. $CO$
  4. $CH _4$
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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

  1. Floods in Yanuna river

  2. Temperature mediated spoilage of marble

  3. Air pollutants from Mathura refinery

  4. Weathering of marble
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Ozone layer of stratosphere requires protection from indiscriminate use of:

  1. fungicides, insecticides, bactericides and medicines

  2. aerosols and high flying jets

  3. atomic explosions and industrial wastes

  4. weather balloons
Reveal answer Fill a bubble to check yourself
B Correct answer
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

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

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

  1. photochemical oxidants

  2. photochemical reductants

  3. aerosols

  4. physical pollutants
Reveal answer Fill a bubble to check yourself
C Correct answer
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.