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Science & Biotechnology

📆 November 4, 2024

(c) CCl₂F₂

Total Questions: 50

21. Which of the following is not a Green House Gas? [S.S.C. Online Constable GD 18.02.2019 (Shift-III)]

Correct Answer: (b) Argon
Solution:Greenhouse gases are responsible for changes in the planet’s atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides, and chlorofluorocarbons.

22. Which gas contributes the most to the greenhouse effect? [S.S.C. Online CHSL (T-I) 8.02.2017 (Shift-II)]

Correct Answer: (a) Water vapor
Solution:Greenhouse gases are responsible for changes in the planet’s atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides, and chlorofluorocarbons.

23. Which of the following constitutes the highest percentage of Greenhouse gases? [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II)]

Correct Answer: (c) Carbon Dioxide
Solution:Greenhouse gases are responsible for changes in the planet’s atmosphere or climate and for global warming. Greenhouse gases responsible for ozone pollution in the troposphere are water vapor (up to 36-72 percent), carbon dioxide (up to 9-26 percent), methane (up to 4-9 percent), ozone (up to 3-7 percent), nitrous oxides, and chlorofluorocarbons.

24. There is a protocol signed to reduce production of CFC, known as [S.S.C. Online CHSL (T-I) 11.01.2017 (Shift-III)]

Correct Answer: (c) Montreal Protocol
Solution:The international treaty designed to protect the ozone layer from CFCs is the "Montreal Protocol." This treaty came into effect on January 1, 1989. India signed this treaty on June 19, 1992.

25. What is the effect of greenhouse gases on the average temperature of the Earth’s atmosphere? [S.S.C. Online MTS (T-I) 16.09.2017 (Shift-I)]

Correct Answer: (a) increases
Solution:Greenhouse gases are responsible for the planet’s atmosphere or climate change and ultimately global warming. Most of these gases are carbon dioxide, nitrous oxide, methane, chlorofluorocarbons, vapor, ozone, etc.

26. Which of the following countries is the largest per capita emitter of carbon dioxide in the world? [C.P.O. S.I. 11.06.2016 (Shift-I)]

Correct Answer: (c) Qatar
Solution:According to World Bank data, Qatar is the world’s highest per capita emitter of carbon dioxide. Qatar’s per capita carbon dioxide emissions in 2013 were 40.5 metric tons, while Saudi Arabia’s was 17.9 and India’s 1.6 metric tons. According to 2014 World Bank data, Qatar’s per capita carbon dioxide emissions were 45.4 metric tons, while Saudi Arabia’s was 19.5 metric tons, the United States 16.5 metric tons, and India’s was 1.7 metric tons.

27. The substances which contaminate the air are called— [S.S.C. Online MTS (T-I) 30.10.2017 (Shift-I)]

Correct Answer: (b) Air pollutant
Solution:The substances which contaminate the air are called air pollutants. Combustion of coal, petrol, diesel, etc., mainly causes oxides of carbon and nitrogen in the air, which are the main causes of air pollution.

28. Which of the following is usually not an air pollutant? [S.S.C. Online Graduate Level (T-I) 2.09.2016 (Shift-I)]

Correct Answer: (d) Nitrous oxide
Solution:Nitrous oxide (N₂O) is not generally a pollutant gas, but some benefits are also obtained from its use in appropriate amounts. It has some benefits:
(i) Dentists use it on a dental patient to achieve a painless condition in dentistry.
(ii) When a person breathes in an environment containing nitrous oxide, he feels happiness and relaxation. For this reason, it is also called laughing gas.

29. Which of the following fuels causes minimum environmental pollution? [S.S.C. Online Graduate Level (T-I) 2.09.2016 (Shift-II)]

Correct Answer: (c) Hydrogen
Solution:Hydrogen gas burns in the presence of oxygen to form only water. This becomes clear from the following equation:
2H₂ + O₂ → 2H₂O + energy
But when the above action is carried out in air instead of pure oxygen, some amount of nitrogen oxides are also produced along with the water vapor. Hence it can be concluded that hydrogen is the least polluting gas.

30. The most serious air pollutant causing health hazard is— [S.S.C. Online Graduate Level (T-I) 27.08.2016 (Shift-III)]

Correct Answer: (a) Sulphur dioxide
Solution:The chemical formula of sulfur dioxide is SO₂. It is a pungent toxic gas with a strong odor, which is also a major air pollutant. Due to its effect, humans get asthma and other serious diseases related to the lungs. The affinity of carbon monoxide gas for hemoglobin is 200 times greater than that of oxygen. This gas binds to hemoglobin to form a highly stable compound called carboxyhemoglobin, which does not release oxygen, causing oxygen deprivation in the body. If this condition lasts for a long time, the person dies.
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