6th Grade > Chemistry
AIR AROUND US MCQs
Total Questions : 100
| Page 6 of 10 pages
Answer: Option A. ->
True
:
A
:
A
Air consists of oxygen which assists burning. Oxygen is necessary for burning of every substance.
Answer: Option A. ->
True
:
A
:
A
Air is present inside water in dissolved state. It is because of this that aquatic species are able to breathe inside water.
Answer: Option B. ->
oxygen
:
B
During respiration, plants absorb oxygen, break down their food and release carbon dioxide.
Oxygen + Glucose → Carbon dioxide + Water + Heat energy
:
B
During respiration, plants absorb oxygen, break down their food and release carbon dioxide.
Oxygen + Glucose → Carbon dioxide + Water + Heat energy
Answer: Option C. ->
Driving a car
:
C
:
C
Rustling of leaves, flying of kite and moving blades of a windmill are the events that occur due to the movement of air. While for driving a car, movement of air is not required.
Answer: Option A. ->
carbon dioxide, oxygen
:
A
:
A
The process by which the plant leaves absorb carbon dioxide to produce glucose (sugar) and oxygen is called photosynthesis. Photosynthesis happens in the presence of sunlight.
Carbon dioxide + Water sunlight→ Sugar + Oxygen.
Answer: Option B. ->
Carbon dioxide
:
B
Air over industrial cities is polluted. This is due to the emission of carbon dioxide and other harmful gases from the factories and industries in their surroundings. Hence, the percentage of carbon dioxide is more near industrial cities compared to its normal percentage in the atmosphere.
:
B
Air over industrial cities is polluted. This is due to the emission of carbon dioxide and other harmful gases from the factories and industries in their surroundings. Hence, the percentage of carbon dioxide is more near industrial cities compared to its normal percentage in the atmosphere.
Answer: Option B. ->
False
:
B
:
B
The percentage of oxygen in the air is same at sea level as it is at high altitudes, which is around 21%. However, at high altitudes the pressure is lower and air is more spread out. This leads to less oxygen availability for the body in each breathe.
Answer: Option B. ->
oxygen
:
B
:
B
Aquatic animals use the oxygen dissolved in water for respiration. A majority of aquatic animals like fish and prawns breathe through special organs called gills. Gills are projections of the skin that help in using oxygen dissolved in water.
Answer: Option C. ->
Air contains water vapour.
:
C
Air is a mixture of many gases. It also contains a small percentage of water vapour (gaseous state of water). When the water vapour present in the air comes in contact with the tumbler containing cold water, it condenses to form tiny droplets on the outer surface of the tumbler.
:
C
Air is a mixture of many gases. It also contains a small percentage of water vapour (gaseous state of water). When the water vapour present in the air comes in contact with the tumbler containing cold water, it condenses to form tiny droplets on the outer surface of the tumbler.
Answer: Option D. ->
Hydrogen < Oxygen < Nitrogen
:
D
The correct ascending order of percentages of the gases as per the composition of air is: hydrogen and other gases - 1%, oxygen - 21% and nitrogen - 78%.
:
D
The correct ascending order of percentages of the gases as per the composition of air is: hydrogen and other gases - 1%, oxygen - 21% and nitrogen - 78%.
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