Question : The percentage of oxygen in the air is approximately:
Option 1: 100%
Option 2: 1%
Option 3: 78%
Option 4: 21%
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Correct Answer: 21%
Solution : The correct answer is 21%.
The troposphere is the layer of the atmosphere which has all the necessary gases on Earth which are vital for the existence of life. In the atmosphere the most abundant gas is nitrogen. Oxygen is the second most abundant gas with a concentration of 21%. Other gases found in the atmosphere are argon, carbon dioxide etc.
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Question : The percentage of nitrogen in air is about ______ by volume.
Question : Find the value of $\frac{\frac{1}{3} + \frac{1}{4}[\frac{2}{5}-\frac{1}{2}]}{1\frac{2}{3} \text{of} \frac{3}{4}-\frac{3}{4} \text{of} \frac{4}{5}}$.
Question : What is the value of $\frac{43 \times 2–21\ \text {of}\ 4}{28–7\ \text {of}\ 5+9}$?
Question : The radius of a circle is increased by 10%. The percentage increase in its area is:
Question : The radius of a sphere is doubled. The percentage increase in its surface area is ______.
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