The humidity of a place
Lies between 10% to 20%
Is always more than 50%
Is always less than 80%
Varies from time to time
____________ is known as the blanket of the Earth.
Atmosphere
Air
Water
Elements
We can find tiny droplets of water on the outer surface of a steel tumbler containing cold water or ice. This shows that
Steel contains air
Air contains water vapour
Cold water can seep through solids
None of these
Which of the following are the uses of air ?
Generating electricity
Disposal of seeds
Flying of birds
All
Which of the following statements is true regarding Earth's atmosphere ?
It gets denser with increase in altitude
It gets thinner with increase in altitude
Its thickness is at least one fourth the radius of the Earth
It contains no solid particles
In seas and oceans, a large number of plants, fishes and other animals live without air. How is this possible ?
The plants and animals come to the surface in regular intervals.
Aquatic plants and animals do not need air to survive.
Water contains dissolved gases which enable them to live.
They survive because of the interdependence of plants and animals.
Smoke is an example of
Liquid-in-gas mixture
Gas-in-solid mixture
Solid-in-gas mixture
Gas-in-liquid mixture
The correct ascending order of gases as per their composition in air is
Oxygen < carbon dioxide < nitrogen
Hydrogen < oxygen < nitrogen
Nitrogen < hydrogen < oxygen
Oxygen < Carbon dioxide < hydrogen
The percentage of nitrogen in air is
21%
0.1%
54%
78%
