Questions

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21 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Fill in the blanks with the appropriate Words:
Initial drops of first rain bring a lot of $.........$along with them.
Answer
Initial drops of first rain bring a lot of dirt along with them.
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Question 31 Mark
Fill in the blanks with the appropriate Words:
$.........$ is the place in nature for gaseous exchange.
Answer
Atmosphere is the place in nature for gaseous exchange.
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Question 41 Mark
Fill in the blanks with the appropriate Words:
Air contains $.........$ particles.
Answer
Air contains dust particles.
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Question 51 Mark
The layer of air around the earth is known as $.........$.
Answer
The layer of air around the earth is known as Atmosphere.
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Question 61 Mark
Fill in the blanks with the appropriate Words:
Air is really not one substance but a $.........$.
Answer
Air is really not one substance but a mixture.
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Question 71 Mark
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Nitrogen of the air is used on a large scale to manufacture $.........$.
Answer
Nitrogen of the air is used on a large scale to manufacture fertilizers.
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Question 81 Mark
Animals consume oxygen for $.........$ and produce carbon dioxide.
Answer
Animals consume oxygen for Breathing and produce carbon dioxide.
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Question 101 Mark
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The component of air that supports burning is called $.........$.
Answer
The component of air that supports burning is called oxygen.
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Question 111 Mark
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The method of separating two components of a mixture which is based on the wind is $.........$.
Answer
The method of separating two components of a mixture which is based on the wind is winnowing.
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Question 121 Mark
Fine hair and $.........$ present inside our nose prevents the entry of dust particles into our respiratory system.
Answer
Fine hair and Mucus present inside our nose prevents the entry of dust particles into our respiratory system.
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Question 141 Mark
Birds, bats and insects can fly due to the presence of $.........$.
Answer
Birds, bats and insects can fly due to the presence of Air.
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Question 151 Mark
Fill in the blanks with the appropriate Words:
$.........$ air is used in tyres of vehicles.
Answer
Compressed air is used in tyres of vehicles.
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Question 161 Mark
Fill in the blanks with the appropriate Words:
Air is present in, atmosphere, water and $.........$.
Answer
Air is present in, atmosphere, water and soil.
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Question 171 Mark
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The aquatic animals use dissolved oxygen in water for respiration. This is possible because oxygen is $.........$ in water.
Answer
The aquatic animals use dissolved oxygen in water for respiration. This is possible because oxygen is soluble in water.
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Question 181 Mark
The $.........$ is used to draw water from tubewells and to run flourmills.
Answer
The Air is used to draw water from tubewells and to run flourmills.
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Question 191 Mark
Fill in the blanks with the appropriate Words:
When air is in $.........$ it is called wind.
Answer
When air is in motion it is called wind.
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Question 201 Mark
Fill in the blanks with the appropriate Words:
Air has no $.........$ and one can see through it. It is $.........$.
Answer
Air has no colour and one can see through it. It is transparent.
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Question 211 Mark
Fill in the blanks with the appropriate Words:
Our earth is surrounded by $.........$.
Answer
Our earth is surrounded by air.
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