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Q4
(CISF/2025)
Geography › World Physical Geography
Which of the following are the major constituents of dry air in the lower atmosphere ?
Result
Your answer:
—
·
Correct:
B
Explanation
The term "dry air" refers to the atmospheric composition excluding water vapour, which is a variable gas. The two most abundant gases in the Earth's lower atmosphere are Nitrogen (N2), making up approximately 78.08% by volume, and Oxygen (O2), making up about 20.95%. Together, these two gases account for nearly 99% of the volume of dry air.
- Argon (~0.93%) and Carbon dioxide (~0.04%) are the next most significant components.
- Methane is considered a trace gas, present in very small concentrations (approx. 0.00017%).
- Options A, C, and D are incorrect because they either include water vapour (which is excluded from the definition of dry air) or classify trace gases like methane as major constituents.
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SIMILAR QUESTIONS
The main constituents of atmospheric air are Oxygen (O2) and Nitrogen (N2). The composition of O2 and N2 is approximately :