Which of these applies to nitrogen?
Nitrogen gas comprises 78% of atmosphere. It does not help in respiration, photosynthesis and burning.
Moisture in air is called
The quantity of water vapour present in air is called as humidity.
In which of the following place quality of air is best?
Quality of air is best in park in comparison to industrial area, busy road crossing and busy market place.
This is used as a fuel in rockets for combustion of fuels
Hydrogen gas is used as fuel in rockets for combustion of fuels due to high calorific value.
Finer hair inside the nose
Finer hairs inside the nose filter the dust particle while inhaling the air.
Winnowing is used to separate
Winnowing is used to separate grains from husk due to difference in their density.
The layer of air around the earth surface is called
The layer of air around the earth surface is called atmosphere.
Name the object which is inflated by air
Balloons is inflated by air due to pressure of air.
Density of air ____________ with height.
Density of air decrease with height as we move upwards.
Gases and fine dust particle together make the
Gases and dust particle together make the smoke. Smoke starts from burning substances.
Oxygen is used in hospitals for
In hospital oxygen gas is used for artificial respiration for patient having respiratory problem.
Atmospheric pressure _____________ with height.
Atmospheric pressure decrease with height due to decrease in density of air.
An empty glass is in fact
There are many more water molecules in a glass of water than nitrogen and oxygen molecules in an empty glass. About 1000 times as many. Molecules in a gas are about 10 times as much distance from each other than molecules in a liquid or solid.
The balance between carbon dioxide and oxygen is maintained by
The balance between carbon dioxide and oxygen is maintained by photosynthesis and respiration in which carbon dioxide and oxygen is used and oxygen and carbon dioxide is produced respectively.
All animals including human exhale
All animals including human exhale carbon dioxide gas and inhale oxygen gas.
Which of the following gas is found in largest quantity in air?
Nitrogen gas is found in largest quantity in air followed by oxygen gas.
During rain, soil animals comes out from their burrows for
During rain, soil animals come out from their burrows for respiration as their burrow is filled by water.
Animals living in water have ____________ for respiration.
Animals living in water have gills for respiration which intake oxygen gas dissolved in water.
In which of the following air is not used?
Air is not required for boiling water but required for inflating tyres, filling balloon and winnowing.
The components of air which are harmful to living beings are
The components of air which are harmful to living beings are dust and smoke that cause pollution.