Effect & Causes of Greenhouse Gases MCQs with Explanations
Practice MCQ Questions
Ques: 1
Which one of the following gases is NOT a greenhouse gas?
Correct Answer:
(D)
O2
Greenhouse gas in an atmosphere is a gas that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in earth’s atmosphere are carbon dioxide, methane, nitrous oxide and ozone. Hence, (d) is the correct answer.
Note: The gases directly responsible for greenhouse effect are – Carbon dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O), CFC, SF6, NF3, etc. While the gases indirectly responsible for greenhouse effect include - Nitrogen oxide (NOX), Carbon monoxide (CO), Non-methane volatile organic compounds (NMVOC) and sulphur dioxide (SO2).
The relative contribution of main Greenhouse Gases are as follows–
Water Vapor about 60%
Carbon Dioxide about 26%
Methane about 4-9%
Ozone about 3-7%
Nitrous Oxide about 1.5%
Chlorofluorocarbons and others about 0.1-0.4%
Ques: 2
Consider the following:
1. Carbon monoxide 2. Methane
3. Ozone 4. Sulphur dioxide
Which of the above are released into atmosphere due to the burning of crop/biomass residue?
Correct Answer:
(D)
1,2,3 and 4
Ques: 3
Which one of the following is NOT a greenhouse gas found naturally in the atmosphere?
Correct Answer:
(A) Nitrogen oxide
Greenhouse gas has the property of absorbing infrared radiation emitted from Earth's surface and reradiating it back to Earth's surface. Carbon dioxide, Methane, ozone and water vapour are the most important greenhouse gases, found naturally in atmosphere. Nitrogen Oxide is not a Green House Gas found naturally in the atmosphere.
Ques: 4
The total amount of green-house gases produced, to directly and indirectly support human activities, is referred to as?
Correct Answer:
(B) Carbon footprint
The total amount of greenhouse gases produced, directly or indirectly to support human activities, is referred to as carbon footprint.
Ques: 5
Methane is emitted from which of the following?
(a) Paddy fields only
(b) Termitary only
Correct Answer:
(C)
Methane (CH4) is emitted by natural resources such as wetlands as well as human activities. Natural Resources - Wetlands are the largest source, emitting CH4 from bacteria that decompose organic materials in the absence of oxygen. Smaller sources include termites, oceans, sediments, volcanoes and wildfires.
Human Induced -
Agriculture - Domestic live stocks such as cattle, produce large amounts of CH4. Paddy cultivation and storage of manure in lagoons also releases methane. Globally, the agriculture sector is the primary source of CH4 emission.
Industry - Methane is the primary component of natural gas.
Waste from Home and Businesses - Methane is generated from the decomposition of waste in landfills.
Note: Rice fields, coal mines and domestic animals are human sources of methane emissions in the atmosphere while wetlands and sea hydrates are natural sources of methane emission. Maximum (about 76% of the total methane emission) from natural sources is emitted through the wetland only.
Ques: 6
Which of the following statements regarding global warming are correct?
Melting of polar ice caps and subsequent rise in the sea level is the most important effect of global warming
The sea-level is likely to rise by one meter by 2070 A.D if the present level of global warming is not controlled
All the coral islands in the world will be submerged
By 2044 A.D, Fiji is likely to be submerged and the rise in the sea level by the same year will pose a grave danger to the Netherlands