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Question

Suppose the concentration of Carbon dioxide, a greenhouse gas responsible for climate change, is 400 ppm. What is its concentration in air in percentage terms?

This question was previously asked in
UGC NET 2019 Paper 1 Question Paper (5-Dec-2019) (Shift 2)
The correct answer is

0.04%

To convert the concentration of Carbon dioxide (CO2) from parts per million (ppm) to percentage terms, we use the conversion factor:

1 ppm = 0.0001%.

Given the concentration of CO2 is 400 ppm, we can calculate its concentration in percentage as follows:

\(\text{Percentage} = 400 \times 0.0001\%\)

Solving the above formula:

\(= 0.04\%\)

Therefore, the concentration of Carbon dioxide in percentage terms is 0.04%.

Let's now evaluate the given options:

  • 0.04% - This matches our calculation.
  • 0.4% - This is incorrect; it is 10 times higher than the actual concentration.
  • 0.004% - This is incorrect; it is 10 times lower than the actual concentration.
  • 4.0% - This is incorrect, as it is 100 times higher than the actual concentration.

Thus, the correct answer is 0.04%, confirming that 0.04% is indeed the concentration of CO2 in air when expressed as a percentage.

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Similar Questions

  1. Amongst the following Green House Gases (GHGs), whose Global Warming Potential (GWP) is considered as 1?

  2. In the context of climate change which of the following observations are correct for 20th century with reference to 1750?

    A. The global average surface temperature has increased by 0.6°C.
    B. Greater increase in daytime temperature than night time has been observed.
    C. Global average sea level rose 0.1-0.2 m largely due to thermal expansion.
    D. The atmosphere concentration of Carbon dioxide (CO2) has increased by 31%.
    E. Precipitation in the northern hemisphere has decreased by 1% per decade.

    Choose the correct answer from the options given below:

  3. Which of the following Green House Gases has no natural source?

  4. Given below are two statements :
    Statement I : In many cases, both organisms and human infrastructure will not be able to move or adapt quickly enough to changing climate.
    Statement II : Infectious diseases are likely to increase as a result of global warming.
    In the light of the above statements, choose the most appropriate answer from the options given below :

  5. Full form of IPCC, a nodal agency in the context of climate change, is:

  6. Given below are two statements
    Statement I: Increased carbon dioxide concentration in the ambient atmosphere is likely to make the world's oceans less acidic.
    Statement II: Increased carbon dioxide concentration in the ambient atmosphere is likely to impact the coral reefs adversely.
    In light of the above statements, choose the correct answer from the options given below:

  7. How many National Missions of the Indian Government are there to address the problem of climate change?

  8. In terms of total $CO_2$ emissions from a country, identify the correct sequence:

  9. In order to avoid catastrophic consequences of climate change, there is general agreement among the countries of the world to limit the rise in average surface temperature of earth compared to that of pre-industrial times by

  10. Which one of the following green house gases has the shortest residence time in the atmosphere?


Important Questions from Climate Change & Global Warming

  1. Greenhouse gas, which is present in the highest quantity in the atmosphere, is

  2. Which one of the following gases have higher Global Warming Potential?

  3. Which of the following two sources of carbon is released?

    A) Volcanic eruption

    B) Combustion of fossil fuels

    C) Landslide

    D) Open mining

    Choose the correct answer from the options given below:

  4. Considering the global warming potential of CO 2as one, the global warming potential of CH 4has been estimated to be approximately :

  5. Which of the following gas is not involved in the production of acid rain?

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