Which of the following is combustible ?
Oxygen
Carbon dioxide
Hydrogen
All
Which of the following plays an important part while drinking a liquid with a straw?
Humidity
Temperature
Atmospheric pressure
Composition of air
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
The percentage of nitrogen in air is:
21%
0.1%
54%
78%
All the plants require nitrogen for:
Reproduction
Photosynthesis
Transpiration
Growth
Which of the following plays a very important role in the oxygen cycle ?
Birds
Animals
Plants
Soil
Smoke is an example of:
Liquid-in-gas mixture
Gas-in-solid mixture
Solid-in-gas mixture
Gas-in-liquid mixture
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
Which of the following statement is true regarding earth's atmosphere?
It gets denser with increase in altitude
It gets thinner with increase in altitude
Its thickness is atleast one fourth the radius of the earth
It contains no solid particles
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
