Class 10 Hindi MCQ Online Test

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Class 10 Hindi MCQ Online Test for Students

In the atmosphere, the highest percentage is of

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen

Option c - Nitrogen

The highest percentage of gas in the air is

A) Hydrogen

B) Carbon dioxide

C) Oxygen

D) Nitrogen

Option d - Nitrogen

If all the plants and trees vanish from the earth, the gas which will decrease is

A) Carbon dioxide

B) Nitrogen

C) Water vapor

D) Oxygen

Option d - Oxygen

International Conference held in Rio de-Janeiro was

A) United Nations Conference on Sustainable Development

B) Environment and Pollution Summit

C) International New Economics

D) None of the above

Option a - United Nations Conference on Sustainable Development

What is the thin layer of gases around the earth called?

A) Biosphere

B) Water particle

C) Atmosphere

D) Hydrosphere

Option c - Atmosphere

Air is a/an

A) Compound

B) Element

C) Mixture

D) Electrolyte

Option c - Mixture

Percentage of nitrogen in dry air

A) 21%

B) 27%

C) 50%

D) 78%

Option d - 78%

Which of the following is considered to be the optimum concentration of carbon dioxide for natural balance in the atmosphere?

A) 0.02%

B) 0.03%

C) 0.04%

D) 0.05%

Option b - 0.03%

Which one of the following Noble Gases is not present in the air?

A) Helium

B) Argon

C) Radon

D) Neon

Option c - Radon

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