Air Book Back Questions & Answers
Unit 4 > Science > Class 6 > Samacheer Kalvi - English Medium
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1. __________ is the percentage of nitrogen in air.
a. 78%
b. 21%
c. 0.03%
d. 1%
Correct answer: a. 78%
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2. Gas exchange takes place in plants using ___________.
a. Stomata
b. Chlorophyll
c. Leaves
d. Flowers
Correct answer: a. Stomata
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3. The constituent of air that supports combustion is __________.
a. Nitrogen
b. carbon-di-oxide
c. Oxygen
d. water vapour
Correct answer: c. Oxygen
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4. Nitrogen is used in the food packaging industry because it _________.
a. provides colour to the food
b. provides oxygen to the food
c. adds proteins and minerals to the food
d. keeps the food fresh
Correct answer: d. keeps the food fresh
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5. _______ and ______ are the two gases, which when taken together, make up about 99 percentage of air.I.Nitrogen II. carbon-di-oxide III. Noble gases IV. Oxygen
a. I and II
b. I and III
c. II and IV
d. I and IV
Correct answer: d. I and IV
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1. __________ is the active component of air.
Correct answer: Oxygen
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2. The gas given out during photosynthesis is _________.
Correct answer: Oxygen
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3. __________ gas is given to the patients having breathing problems.
Correct answer: Oxygen
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4. _______ can be seen moving in a beam of sunlight in a dark room
Correct answer: Dust particles
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5. ________ gas turns lime water milky.
Correct answer: Carbon dioxide
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1. Inhaled air contains a large amount of carbon-di-oxide.
Correct answer: False
Correct Statement: Inhaled air contains a large amount of oxygen.
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2. Planting trees help in decreasing global warming
Correct answer: True
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3. The composition of air is always exactly the same.
Correct answer: False
Correct Statement: The composition of air varies from place to place
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4. Whales come up to the water surface to breathe in oxygen.
Correct answer: True
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5. The balance of oxygen in atmosphere is maintained through photosynthesis in animals and respiration in plants.
Correct answer: False
Correct Statement: The balance of oxygen in atmosphere is maintained through photosynthesis in plants and respiration in animals.
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1. Moving Air
Correct answer: Wind
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2. Layer in which we live
Correct answer: Troposphere
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3. Stratosphere
Correct answer: Ozone layer
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4. Oxygen
Correct answer: Combustion
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5. carbon-di-oxide
Correct answer: Photosynthesis
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1. Photosynthesis : _____ :: Respiration : Oxygen
Correct answer: carbon dioxide
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2. 78% of air : Does not support combustion :: _____ : Supports combustion
Correct answer: 21% of air