Railway Science (Environment – Global Warming)

Total Questions: 15

1. Which of the following leads to global warming? [RRC Group D 09/09/2022 (Evening)]

Correct Answer: (b) Increase in CO₂ percentage in the air
Solution:

Global warming: The earth's average temperature rises due to increased amounts of greenhouse gasses. Greenhouse gasses like carbon dioxide, methane and ozone trap the incoming radiation from the sun.
Carbon dioxide (CO₂): It is released through human activities such as burning fossil fuels, deforestation, and industrial processes. Cause of global warming: Increase in the levels of atmospheric ozone, Accumulation of plastic waste

2. Which of the following is an example of greenhouse gas? [RRC Group D 15/09/2022 (Afternoon)]

Correct Answer: (a) Carbon dioxide
Solution:

Greenhouse Gas - gas that absorbs and emits radiant energy at thermal infrared wavelength. examples - Methane (CH₄), Nitrous oxide (N₂O), Ozone (O₃), Hydrofluorocarbons, Carbon dioxide.
Greenhouse effect - The greenhouse effect occurs when greenhouse gases in a planet's atmosphere trap some of the heat radiated from the planet's surface. Phosphorus pentoxide (P₄O₁₀) - It is widely used as a dehydrating agent.

3. Which continent will suffer the most from global warming in terms of the number of people affected ? [RRC Group D 27/09/2022 (Morning)]

Correct Answer: (c) Asia; oceans will rise.
Solution:

Global warming - A gradual increase in the earth’s temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs (Chlorofluorocarbon) and other pollutants.
Causes - Deforestation, Vehicles, Industrial Development, Volcanoes. Effects - Rise in Temperature, Ecosystem imbalance, Loss of Natural Habitat.

4. Which of the following natural resources do we need to use judiciously to prevent intense global warming? [RRC Group D 28/09/2022 (Afternoon)]

Correct Answer: (c) Coal and petroleum
Solution:

Global warming is a gradual increase in the earth’s temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFC (Chlorofluorocarbon), and other pollutants.
It is caused by increased concentrations of greenhouse gasses in the atmosphere. Greenhouse gasses are Carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O) and fluorinated gasses.

5. Which of the following does not occur due to burning of fossil fuels? [RRC Group D 29/09/2022 (Morning)]

Correct Answer: (d) Depletion of ozone levels in the upper layers of the atmosphere
Solution:

Fossil fuels (Coal, crude oil, and natural gas) are non-renewable resources and are burned to release their energy.
Effects of Fossil Fuel - Air pollution, water pollution and climate change.
Haze - It is an atmospheric phenomenon where dust, smoke and dry particles in the air obscure the sky’s clarity.
Acid Rain - Any form of precipitation with acidic components such as sulfuric or nitric acid that fall to the ground from the atmosphere.

6. Which sector is the biggest emitter of greenhouse gases? [RRB NTPC CBT - I (08/01/2021) Evening]

Correct Answer: (b) Energy
Solution:

Greenhouse gas: It is a gas that absorbs and emits radiant energy at thermal infrared wavelengths. Types: Carbon dioxide (CO₂), Methane (CH₄), Nitrous oxide (N₂O), Industrial gasses: Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), Sulfur hexafluoride (SF₆), Nitrogen trifluoride (NF₃).

7. Which is an international treaty among industrialized nations that sets mandatory limits on greenhouse gas emissions? [RRB NTPC CBT - I (19/01/2021) Morning]

Correct Answer: (c) Kyoto Protocol
Solution:

Adopted in Kyoto (Japan) on 11 December 1997. Came into force - 16 February 2005.

8. Which of the following reasons can be attributed to ‘Arctic Greening’ ? [RRB NTPC CBT - I (25/01/2021) Evening]

Correct Answer: (d) Global warming
Solution:

Global warming. “It is a gradual increase in the earth's temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants. Arctic greening refers to the visible and increasing growth of plants and vegetation in the Arctic region.

9. In which year did the United Nations Environment Programme (UNEP) succeed in forging an agreement to freeze CFC production in 1986 levels? [RRB NTPC CBT - I ( 30/01/2021) Evening]

Correct Answer: (b) 1987
Solution:

UNEP (The United Nations Environment Programme): Formation - 5 June 1972, Headquarter - Nairobi (Kenya). Parent Organization: The United Nations.

10. Which of the following chemicals/gasses is/are responsible for causing the greenhouse effect? [RRB NTPC CBT - I (10/02/2021) Evening]

Correct Answer: (c) Water vapor, 𝐶𝑂₂ 𝑎𝑛𝑑 𝐶𝐹𝐶𝑠
Solution:

A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect.