6th Grade > Chemistry
AIR AROUND US MCQs
Total Questions : 100
| Page 3 of 10 pages
Answer: Option A. -> Statement I is true and statement II is the correct explanation.
:
A
When water is heated, bubbles are seen due to the presence of air inside water. On heating, air tries to escape out of the water and so bubbles are seen.
:
A
When water is heated, bubbles are seen due to the presence of air inside water. On heating, air tries to escape out of the water and so bubbles are seen.
Answer: Option A. -> Air present in lump of cotton is replaced by water which occupies less space.
:
A
A lump of cotton is porous, it has air in it. When it is dipped in water, water removes air and occupies the space. Space occupied by water is less than that occupied by air.
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A
A lump of cotton is porous, it has air in it. When it is dipped in water, water removes air and occupies the space. Space occupied by water is less than that occupied by air.
Answer: Option D. -> Nitrogen
:
D
Nitrogen is used to fill the packets of potato chips because unlike many other gases, nitrogen doesn't react with the food present in the packet. Hence, the flavour of the food doesn't change and remains edible for longer time.
:
D
Nitrogen is used to fill the packets of potato chips because unlike many other gases, nitrogen doesn't react with the food present in the packet. Hence, the flavour of the food doesn't change and remains edible for longer time.
Answer: Option C. -> Statement I is true and statement II is false
:
C
The air at a crowded crossing is generally very polluted. The mask over policemen's nose filters dust from the air but it is not meant to filter carbon dioxide.
:
C
The air at a crowded crossing is generally very polluted. The mask over policemen's nose filters dust from the air but it is not meant to filter carbon dioxide.
Answer: Option A. -> Oxygen
:
A
The gas present in the atmosphere which is essential for respirationis oxygen. Oxygen constitutes about 21% of the Earth's atmosphere.
:
A
The gas present in the atmosphere which is essential for respirationis oxygen. Oxygen constitutes about 21% of the Earth's atmosphere.
Answer: Option D. -> Carbon dioxide
:
D
Plants need carbon dioxide for photosynthesis through which they produce food for themselves.During photosynthesis, plants take in sunlight, water and carbon dioxide toproduce starch andrelease oxygen as a byproduct.
:
D
Plants need carbon dioxide for photosynthesis through which they produce food for themselves.During photosynthesis, plants take in sunlight, water and carbon dioxide toproduce starch andrelease oxygen as a byproduct.
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Name of the process : 1Mark
Explanation :1Mark
Winnowingis an agricultural method developed by ancient people for separating grain from chaff.
This separation is done by blowing air through the grains andallowingthewindoraforcedcurrentof airtoblowaway chaff and impurities which are lighter than the grains.
:
Oxygen.
Nitrogen and carbon dioxide both do not support combustion whereas oxygen does.
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