EASY
Earn 100

The percentage of oxygen in the air:

50% studentsanswered this correctly

Important Questions on Natural Resources-Air,Water and Land

MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Which of the following is not a pollutant?
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Which component of air acts as a supporter of combustion?
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Explain why, if the clothes of a person catch fire accidently, he is covered with a woollen blanket. Give reason for your answer.
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Name the two main gases present in the air.
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air

Explain why a burning candle stops burning after some time when covered with an inverted gas jar.

EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Name the component of air which condenses on a cold surface to form drops of a liquid. What is this liquid?
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Explain why, a burning coal fire stops burning after some time when covered with a vessel.
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
The air that we breathe in is rich in carbon dioxide.
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Name any one component of air which does not support burning.
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Name the major component of the air
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Apart from nitrogen and oxygen, name two other gases present in the air.
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
What is the importance of water vapour in the air?
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Which gas is given to the patients having breathing problems?
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Plants use carbon dioxide from the air for photosynthesis. How is the carbon dioxide in the air (or atmosphere) replaced?
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
When it rains heavily, it is easy to find earthworms in the garden. Why?
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Which gas in the atmosphere is essential for respiration?
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
How will you show that air (or oxygen) is necessary for burning?
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air

Which gas is needed for fire to burn?

HARD
Science>Chemistry>Natural Resources-Air,Water and Land>Air

Study the picture and answer the questions.

Question Image

(i) Will the flame of the candle go out at once? Why or why not?

(ii) Will the water start boiling after some time? Why or why not?

(iii) Will the candle flame go out after some time? Why or why not?

(iv) If you hold the inverted glass jar so that it covers the candle flame but its rim is above the water level, what will happen?

EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Which of the following is necessary for burning things?
Argon, Carbon dioxide, Oxygen, Nitrogen, Helium