AIR AND ATMOSPHERE

The scientist who named the active and the inactive component of air

• John Mayow

• Antoine Lavoisier

• Joseph Priestley

• Charles Darwin

The coldest layer of Atmosphere is:

• Thermosphere

• Troposphere

• Mesophere

• Ionosphere

What do the water droplets on the glass indicate?

• air contains carbon dioxide

• air contains water vapour

• air contains nitrogen

• none of the above

Choose the CORRECT conclusion for the given bell jar experiment :

• The level of the water in the jar increases by 1/5

• Dense white fumes of phosphorus pentoxide are formed

• Air exerts pressure

• Nitrogen is combustible

The tiny pores present on the leaves that help in the exchange of gases is :

• Stomata

• Pores

• lenticels

• roots

Identify the type of bacteria.

• Symbiotic bacteria

• Carbonaceous bactera

• Virus

• none of the above

Which of the following is an impurity in air?

• Carbon dioxide

• Nitrogen

• Oxygen

• Carbon monoxide

Deep sea divers contain oxyen cylinders . Select the reason for the given statement.

• there is less oxygen in the deep sea

• there is no carbon dioxide in the sea

• there is less carbondioxide in the air

• none of the above

Choose all the possible reasons for filling nitrogen in food packets:

• drives out oxygen

• prevents bacterial growth

• promotes bacterial growth

• all of the above