Environmental Science Questions and Answers – Greenhouse Gases – 1

This set of Environmental Science Multiple Choice Questions & Answers (MCQs) focuses on “Greenhouse Gases – 1”.

1. By how much has atmospheric carbon dioxide concentration increased ever since the Industrial Revolution?
a) 20%
b) 10%
c) 40%
d) 60%
View Answer

Answer: c
Explanation: Due to excessive combustion of fossil fuels, the carbon dioxide concentration shot up from 280ppm during 1750 to nearly 400ppm recently.

2. Which is the most abundant greenhouse gas in the atmosphere?
a) Carbon dioxide
b) Water vapour
c) Methane
d) Nitrogen
View Answer

Answer: b
Explanation: Water vapour also helps in trapping sun’s heat energy and thereby serves as the most abundant greenhouse gas.

3. What does the phrase “anthropogenic CO2 emissions” mean?
a) Human made CO2 emissions
b) Industrial CO2 emissions
c) Natural CO2 emissions
d) All of the mentioned
View Answer

Answer: a
Explanation: The word “anthropogenic” stands for environmental impact due to human activity.
advertisement
advertisement

4. Which of the following is the largest sink for carbon dioxide gas?
a) Forests
b) Oceans
c) Ice sheets
d) Grasslands
View Answer

Answer: b
Explanation: Carbon dioxide dissolves in water as not only gas but also in the bicarbonates form. Therefore, ocean is one of the major sinks for carbon dioxide.

5. Apart from Earth, which other celestial body(s) exhibits greenhouse gas effect?
a) Venus
b) Mars
c) Titan
d) All of the mentioned
View Answer

Answer: d
Explanation: Titan, Mars and Venus contain several greenhouse gases in their atmosphere and exhibit greenhouse effect.

6. Which of the following bodies in the solar system has anti-greenhouse effect?
a) Jupiter
b) Mars
c) Titan
d) Venus
View Answer

Answer: c
Explanation: Titan also exhibits anti-greenhouse effect. The haze, constituting organic molecules, is not very efficient in trapping infrared radiations and thereby reduces the temperature by 9 K.

7. Which of the following radiations of the sun do greenhouse gases trap?
a) Visible radiations
b) Infrared radiations
c) UV radiations
d) All the radiations
View Answer

Answer: b
Explanation: Greenhouse gases trap the infrared radiations from the sun and reflect it back to the Earth’s surface thereby heating up the planet.
advertisement

8. What does “airborne fraction” with respect to greenhouse gases indicate?
a) Amount of greenhouse gases that are released into air due to industrial process
b) Proportion of greenhouse gases in air to all the other atmospheric gases
c) Proportion of greenhouse gas emission that remain even after a specified time
d) None of the mentioned
View Answer

Answer: c
Explanation: The airborne fraction (AF) indicates the proportion of GHG emissions that remain after a given time.

9. Clouds help in cooling down the planet and do not contribute to greenhouse effect.
a) True
b) False
View Answer

Answer: b
Explanation: Clouds can absorb infrared radiation as well as emit them and hence contribute to greenhouse effect.
advertisement

10. What does GWP in the context of greenhouse gases indicate?
a) Global Warming Parameters
b) Gradual Warming Pattern
c) Global Warming Patterns
d) Global Warming Potential
View Answer

Answer: d
Explanation: Global warming potential indicates the heat trapped by a greenhouse gas over 20, 50 or 100 years in terms of equivalent heat trapped by carbon dioxide over the same period of time.

11. What is the GWP of methane over a time period of 20 years?
a) 86
b) 34
c) 43
d) 67
View Answer

Answer: a
Explanation: According to IPCC methane which has a 12.4 years lifetime, has a GWP of 86 over a period of 20 years.

Sanfoundry Global Education & Learning Series – Environmental Science.

To practice all areas of Environmental Science, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.