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Class 10 Hindi mcq Online test for Students
Which gas forms the largest proportion of the Earth’s Atmosphere?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
Option c - Nitrogen
The gas present in the maximum amount in air is
A) Hydrogen
B) Carbon dioxide
C) Oxygen
D) Nitrogen
Option d - Nitrogen
If all plants and trees disappeared from the Earth, which gas would show a decline?
A) Carbon dioxide
B) Nitrogen
C) Water vapour
D) Oxygen
Option d - Oxygen
The international conference held at Rio de Janeiro is known as
A) United Nations Conference on Sustainable Development
B) Environment and Pollution Summit
C) International New Economics Conference
D) None of the above
Option a - United Nations Conference on Sustainable Development
What do we call the thin blanket of gases surrounding the Earth?
A) Biosphere
B) Water particles
C) Atmosphere
D) Hydrosphere
Option c - Atmosphere
Air can best be described as a
A) Compound
B) Element
C) Mixture
D) Electrolyte
Option c - Mixture
What percentage of nitrogen is present in dry air?
A) 21%
B) 27%
C) 50%
D) 78%
Option d - 78%
Which of the following is regarded as the ideal concentration of carbon dioxide for maintaining natural atmospheric balance?
A) 0.02%
B) 0.03%
C) 0.04%
D) 0.05%
Option b - 0.03%
Which one of the following noble gases is absent from atmospheric air?
A) Helium
B) Argon
C) Radon
D) Neon
Option c - Radon
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