Tag: depletion of ozone layer

Questions Related to depletion of ozone layer

Which two gases are most responsible for greenhouse effect?

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Water vapour

  2. Carbon dioxide

  3. Argon

  4. Both a and b

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Correct Option: D

Chemical substances that increase earth's surface temperature is known as

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Green house gases

  2. Global warming

  3. Climate change

  4. Urbanization

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Correct Option: A

Which gas plays a major role in global warming?

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Carbon monoxide

  2. Nitrogen

  3. Carbon dioxide

  4. Sulphur dioxide

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Correct Option: C
Explanation:

The warming up of the atmosphere due to trapped radiation is called green house effect. Green house gases like carbon dioxide, methane, nitrous oxide etc; increase in green house gases leads to global  warming.

Green house effect is caused by

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Green plants

  2. Infrared rays

  3. UV rays

  4. X-rays

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Correct Option: B
Explanation:

When solar radiation enters the atmosphere, it is absorbed by the clouds and gases and heats the earth's surface. The earth, in return, reflects some of this heat into the atmosphere as infrared radiation. Most of this infrared radiation gets absorbed by atmospheric gases such as carbon dioxide, methane, nitrous oxide, and ozone, commonly known as greenhouse gases. These gases send the infrared radiation back to the earth's surface, thereby heating the surface again. This cycle repeats several times, thereby resulting in the greenhouse effect.

So, the correct answer is 'Infrared rays'.

Which of the following contribute to green house effect?

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Methane

  2. Carbondioxide

  3. CFCs

  4. All of the above

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Correct Option: D
Explanation:

(The greenhouse effect is the natural process by which the atmosphere traps some of the Sun's energy,  warming the Earth enough to support life.  Most mainstream scientists believe a human-driven increase in "greenhouse gases" is increasing the effect artificially.
These gases include carbon dioxide, methane, nitrous oxide, water vapour, CFCs, ozone etc. Ozone in the stratosphere acts as a protective layer, but harmful if it is present in the troposphere).

So, the correct answer is All of the above'.

CDM is 

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Clean development mechanism

  2. Clear development machinary

  3. Clean development machine

  4. Clean development movement

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Correct Option: A
Explanation:

A national CDM (clean development mechanism) authority has set up in December 2003 to formulate projects for reducing emission of CO$ _2$ and other green house gases. 

A natural phenomenon that becomes harmful due to pollution is _____________.

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Global warming

  2. Ecological balance

  3. Greenhouse effect

  4. Desertification

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Correct Option: C
Explanation:

Solar radiation is absorbed in the Earth's surface and emitted as thermal energy that can be re-absorbed by greenhouse gases. Greenhouse gases include water vapor, carbon dioxide, ozone, and methane; the major components of atmospheric gas nitrogen, oxygen, and argon are transparent to infrared radiation. The greenhouse effect insulates the earth's surface, making it hospitable to life; however, human activities have increased the concentration of these gases, causing global warming.

So, the correct answer is 'Greenhouse effect'.

Assertion :Green - house effect is due to thick layer of carbon dioxide.

Reason :The glass panels of a green - house allowing the sunlight to filter through but preventing the heat from being re-radiated in outer space.

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true

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Correct Option: B

Which one of the following is not a green house gas?

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. $CO _2$

  2. $CH _4$

  3. $O _2$

  4. CFCs

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Correct Option: C
Explanation:

Greenhouse gases are called so because they are capable of absorbing the insolation from the sun and keeping it within the troposphere, thereby increasing the overall temperature of the earth, called global warming. Carbon dioxide, methane, nitrous oxide, ozone, Chlorofluorocarbons and sulphur hexafluoride are considered to be the potent greenhouse gases. Oxygen is not a greenhouse gas.

Hence, the correct answer is 'O$ _{2}$' 

Surface of earth is kept warm by

zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

  1. Solar radiations

  2. Geothermal energy

  3. Green house flux

  4. Absorption of infra-radiations by green house gases

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Correct Option: C
Explanation:

The gases in the troposphere of the atmosphere absorb the sun radiations and trap them so that they do not reflect back. This process allows the heat to remain trapped with in the atmosphere and the earth surface remains warm. This process is called greenhouse effect and the absorbed radiations striking the earth's surface are called green house flux. Carbon dioxide, water vapour, oxides of nitrogen are useful for this purpose. 

Hence, the correct answer is 'Green house flux'.