Environmental Studies · General Awareness

Greenhouse Gases and Atmosphere

1,262 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
  1. oxygen

  2. hydrogen

  3. methane

  4. nitrogen

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Biogas is a renewable energy source produced when organic matter breaks down in the absence of oxygen. It is composed primarily of methane (around 50-70%), along with carbon dioxide and small amounts of other gases. Methane is the combustible component.

Multiple choice

The three issues to be discussed at the conference were

Directions: Read the passage below and answer the question that follows:

Are the forebodings about the impending global warming really producing the intended policy responses from the governments of various countries? “Not so” would be the answer, judging the fate of the recent global conference, sponsored by the Netherlands Government at Nordwijk. Here was a gathering of representatives – climatologists and Ministers of Environment – of 60 countries including the United States, United Kingdom, the Soviet Union, Japan and India. On the agenda before the conference were three crucial issues relating to stemming of the greenhouse effect or the global build up of carbon dioxide.

First, there was the question of the industrial countries agreeing upon freezing CO2 emission at current levels by 2000 AD, and achieving 20% cuts by 2005 AD, first mooted at the Toronto world conference of June 1988. Second, there was the proposal to concert a world–wide afforestation programme covering 12 million hectares per year as a method of combating the decreased carbon fixation caused by the unstoppable deforestation all over the third world. Thirdly, the conference also sought to obtain a mandate for a preparatory draft for a global convention on climate.

None of these aims, in fact, has materialised. The industrialised countries, without exception have turned down the proposition that makes it compulsory for them to adopt a time bound containment of CO2 emission through appropriate changes in the industrial systems and in the energy mix. Although the resistance to any such commitment by countries such as the United States and Britain is not difficult to understand in view of the paucity of empirical information as what the costs of industrial restructuring would be, there can hardly be any doubt that these countries are yet to overcome their allergic attitude to the very concept of moving away from the dominating fossil fuel energy deployment.

Japan’s well–known stance of having moved resolutely ahead on the path of restructuring and away from high levels of CO2 emissions was predictably reaffirmed at the conference. Although the developing countries find themselves in a hopeless predicament, they are not being able to commit themselves to time bound environmental action plans, such as stopping the usage of Chloro–Fluoro Carbons (CFCs) by the end of the century and the proposal for graduated mitigation of CO2 emission brought up at the Nordwijk conference, there is fortunately no prospect of global warming being treated as a totally extraneous issue by the consequences of the greenhouse effect. For low–lying countries, such as Egypt, Maldives, would hesitate to call for determined global preventive action.

What lessons do the vacillations registered at the Nordwijk conference hold for policymakers worldwide? One obvious conclusion is that the industrial countries should begin setting the example, rather than merely repeat the percepts about the need to contain the damage to the precious resources of the environment. There are some small things that the developed countries can do to uncomplicate the task of ensuring the developing nations stick to the advocated environment friendly measures. One of these, which says that the debt overhead that torments the developing countries can be overcome by mere “forgiveness” or resumption of private commercial, has to be put to rest by rejecting it completely.

A better alternative will be that the global community organises a massive programme of concessional financial assistance to the poor countries, to enable them to achieve transfer of industrial energy and environmental technologies which would give content and meaning to the otherwise amorphous paradigm of suitable development. It is for the developing countries to bend their energies and work for substantial improvements in the living conditions of the masses of the poor without aping the misguided and discredited anti–environment policy matrix of the North.

  1. measures to reduce the amount of CO2, increasing agriculture and getting consent for guidelines to be followed

  2. cutting down the amount of CO2, cutting more trees and making rules on ways to control the climate

  3. reducing the amount of CO2, planting more trees and getting all the members to agree to set rules

  4. stopping the use of CFC’s, decreasing the amount of CO2 and planting more trees

  5. trimming down the amount of CO2, encouraging the plantation of more trees and conducting a poll to list the members that agree to the two

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The second paragraph gives the three issues which were to be taken up at the convention. For the third issue the key phrase is, 'Thirdly, the conference ...' explains that conference wanted the members to adhere to the new formulated policies. 

Multiple choice
  1. nitrogen

  2. carbon dioxide

  3. oxygen

  4. hydrogen

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrogen makes up about 78% of Earth's atmosphere by volume, making it the major constituent. Oxygen is second at about 21%, while carbon dioxide is only about 0.04%. Hydrogen exists in trace amounts only.

Multiple choice
  1. Fungi

  2. Earthworm

  3. Bacteria

  4. Green plants

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteria are major producers of greenhouse gases. Denitrifying bacteria produce nitrous oxide (N2O) as a byproduct, while methanogenic archaea (often grouped with bacteria in general contexts) produce methane (CH4) in anaerobic environments like wetlands and rice paddies. Earthworms improve soil but don't directly produce these gases.

Multiple choice
  1. carbon dioxide

  2. methane

  3. acetylene

  4. lungs

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gobar gas (biogas) primarily consists of methane (50-75%), which is produced by anaerobic decomposition of organic matter like cattle dung. Carbon dioxide makes up most of the remainder. The other options are incorrect - acetylene is a different hydrocarbon and lungs are organs.

Multiple choice
  1. methane

  2. ethane

  3. butane

  4. propane

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biogas primarily contains methane (50-75%), along with carbon dioxide and traces of other gases. Methane is the main combustible component that makes biogas useful as a fuel. Ethane, butane, and propane are higher hydrocarbons not typically found in significant amounts in biogas.

Multiple choice
  1. Carbon dioxide

  2. Chloro fluorocarbon

  3. Carbon monoxide

  4. Freon

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon dioxide (CO2) is the most significant anthropogenic greenhouse gas, contributing approximately 76% of all greenhouse gas emissions from human activities. It is released primarily from burning fossil fuels. Chlorofluorocarbons are potent greenhouse gases but exist in much smaller quantities. Carbon monoxide is not a greenhouse gas. Freon is a brand name for CFCs.