Environmental Studies · General Awareness

Greenhouse Gases and Atmosphere

1,328 Questions

Review important questions related to greenhouse gases, global warming, and atmospheric changes. The practice set focuses on identifying major pollutants and their environmental impact. These concepts are tested in the general awareness and environmental studies sections.

Greenhouse gas identificationGlobal warming processAtmospheric carbon dioxideMethane emissionsCement production emissions

Greenhouse Gases and Atmosphere Questions

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

Greenhouse effect is due to

  1. accumulation of $ { O } _{ 3 } $ and depletion of $ { CO } _{ 2 } $
  2. accumulation of both $ { O } _{ 3 } $ and $ { CO } _{ 2 } $
  3. accumulation of $ { CO } _{ 2 } $ and depletion of $ { O } _{ 3 } $

  4. presence of green plants on the Earth.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Greenhouse effect, a warming of Earth’s surface and troposphere (the lowest layer of the atmosphere) is caused by the presence of water vapour, carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapour has the largest effect. The atmosphere allows most of the visible light from the Sun to pass through and reach Earth’s surface. As Earth’s surface is heated by sunlight, it radiates part of this energy back toward space as infrared radiation. This radiation, unlike visible light, tends to be absorbed by the greenhouse gases in the atmosphere, raising its temperature. The heated atmosphere in turn radiates infrared radiation back toward Earth’s surface. 
So the correct option is 'accumulation of CO$ _2$ and depletion of O$ _3$'.

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

Which of the following is a green house gas?

  1. Methane

  2. CO

  3. Water vapour

  4. Oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The warming of earth's surface when sun radiations are absorbed and trapped in earth's atmosphere, is called greenhouse effect. The gases responsible for green house effect are called green house gases which trap the radiations and don't let them reflect back from the earth's surface. The green house gases are Chlorofluorocarbons (CFCs), Carbon dioxide (CO2), Methane (CH4) and Nitrous Oxide (N2O). 
So, the correct answer is 'Methane'.
Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Carbon dioxide is called a green house gas because

  1. It emits light

  2. It traps infra red radiations

  3. It traps ultraviolet radiations

  4. It is involved in photosynthesis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The warming of earth's surface when sun radiations are absorbed and trapped in earth's atmosphere, is called greenhouse effect. The gases responsible for green house effect are called green house gases which trap the radiations and don't let them reflect back from the earth's surface. Carbon dioxide traps the infra red radiations and accounts for greatest contribution to greenhouse effect.
So, the correct answer is 'It traps infra red radiations'.
Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Which greenhouse gas contributes 20% to global warming?

  1. Methane
  2. N$ _2$O

  3. CFCs
  4. CO$ _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
he gases responsible for green house effect are called green house gases which trap the radiations and don't let them reflect back from the earth's surface. The green house gases are Chlorofluorocarbons (CFC's), Carbon dioxide (CO2), Methane (CH4) and Nitrous Oxide (N2O). 
The approximate percentage of different greenhouse gases in the atmosphere is:
CFCs - 14%
CO2 - 60%
‎CH4 - 20%
N2O - 6%
So, the correct answer is 'Methane'.
Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Gases commonly referred as green house gases are :

  1. $CH _4$
  2. $CO _2$

  3. CFC
  4. $NH _3$
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation
Greenhouse gases absorbs radiations from sun that are reflected back from earth's surface. In this way, they prevent the radiations from escaping. These gases can cause greenhouse effect in which there is warming of earth's surface. Gases like methane (CH4), carbon dioxide (CO2), CFC (Chlorofluorocarbon) and Nitrous oxide (N2O) are greenhouse gases. Excess concentration of greenhouse gases in atmosphere can cause global warming.
So, the correct answer is options 'A, B and C'. 
Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

The main green house gas is

  1. Ozone

  2. Oxygen

  3. Helium

  4. Cardon dioxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Greenhouse gases are the gases that contribute to the greenhouse effect by absorbing the earth's heat and re-radiating it towards the earth. Carbon dioxide is the highest (among gases) contributor towards greenhouse effect and contributes about 9-26%, followed by methane (contributes 4-9%), and ozone (3-7%). Over the past few years, carbon dioxide has caused most of the global warming as it is present in abundance in the atmosphere and its amount is increasing over the years. So, even though other gases have a more contributing effect per molecule, the amount of carbon dioxide is so high that it contributes more than the other gases. Due to this carbon dioxide is considered the main greenhouse gas. 

Thus, the correct answer is 'Carbon dioxide.' 

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

The true statement about 'Green -house effect' is that it is

  1. Caused by combination of many gases
  2. Caused only by $CO _2$
  3. Caused by $CO _2,CFC,CH _4$ and $NO _2$ gases

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Greenhouse effect is the phenomenon in which radiations from the sun are trapped in the earth's surface and this causes the warming of surface and increase in temperature of earth. Various gases such as carbon dioxide and carbon monoxide trap the heat radiations that enter the earth's surface and promotes greenhouse effect. Such gases are called greenhouse gases. Approximate contribution of different gases to greenhouse effect is as follows:
  • Carbon dioxide (CO2)- 60%
  • Methane (CH4)- 20%
  • Chlorofluorocarbons (CFC)- 14%
  • Nitrous oxide (N2O)- 6%
Hence, greenhouse effect is caused by combination of many gases.
So, the correct answer is 'Caused by combination of many gases'.
Multiple choice zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

The most abundant greenhouse gas in the earth's atmosphere:

  1. Carbon dioxide $(CO _{2})$
  2. Nitrous oxide $(N _{2}O)$
  3. Water vapor $(H _{2}O)$
  4. Methane $(CH _{4})$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water vapor is the most abundant greenhouse gas in the atmosphere, though its concentration is highly variable and it is not typically considered a direct driver of anthropogenic climate change.

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

The green house gases, otherwise called radioactively active gases includes

  1. Carbon dioxide
  2. $CH _{4}$
  3. $N _{2}O$

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

Carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) are all greenhouse gases that trap heat in the atmosphere. They are called 'radiatively active' gases because they absorb and emit infrared radiation, though the question incorrectly states 'radioactively.' Each of these gases contributes to the natural greenhouse effect to varying degrees.

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

Which gas plays a major role in global warming?

  1. Carbon monoxide

  2. Nitrogen

  3. Carbon dioxide

  4. Sulphur dioxide
Reveal answer Fill a bubble to check yourself
C Correct answer
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.