MCQ on life supports class 5

A. The atmosphere is held around the Earth by the Earth’s-

• Gravity

• Power

• Troposphere

• None of the above

We need air for

• Breathing

• Burning

• Oxygen

• Carbon dioxide

Tick the correct statement-

• The components of air consists of 78 % oxygen, 4% nitrogen and 34% other gases

• The components of air consists of 78 % nitrogen , 21% oxygen and less than 1% of other gases

• The components of air consists of 76% other gases , 5 % argon and 67% oxygen

• All the answers are wrong

Layers of atmosphere include

• crust, mantle and core

• Troposphere, stratosphere, mesosphere,thermosphere, exosphere

• Oxygen , carbon dioxide, mesophere

• None of the above

Why does air have Weight ?

• Because

  of carbon dioxide and argon

• Because of the Earth’s gravity

• the air inside the balloon is under greater pressure than the air outside.

• All of the above