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Air around Us Test - 1

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Air around Us Test - 1
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  • Question 1
    1 / -0

    Finer hair inside the nose

    Solution

    Explanation:

    Finer hairs inside the nose filter the dust particle while inhaling the air. Thus the unwanted dust particles does not enter our lungs through nasal cavity.

     

  • Question 2
    1 / -0

    This is used as a fuel in rockets for combustion of fuels

    Solution

    Explanation:

    Hydrogen gas is used as fuel in rockets for combustion of fuels due to high calorific value. Hydrogen is also highly flammable.

     

  • Question 3
    1 / -0

    In which of the following place quality of air is best?

    Solution

    Explanation:

    Quality of air is better in park in comparison to market place, industrial area and busy road crossing because park consists of more plants and no vehicles move inside the park.

     

  • Question 4
    1 / -0

    Moisture in air is called ?

    Solution

    Explanation:

    The amount of water vapour present in the  air is called as humidity.

     

  • Question 5
    1 / -0

    Which of these applies to nitrogen?

    Solution

    Explanation:

    Nitrogen gas comprises 78% of earth's atmosphere. It does not help in respiration, and burning. It plays a very important role in photosynthesis.

     

  • Question 6
    1 / -0

    The nose and mouth of traffic police  is covered with

    Solution

    Explanation:

    The vehicles  on the road leave toxic substances in the air . The high pollutants in the air can cause severe health and respiratory problems. The traffic police is exposed to these pollutants for a very long time during his work as traffic police everyday. Hence the traffic police cover his nose and mouth with a mask.

     

  • Question 7
    1 / -0

    Which gas is produced on burning of fossil fuels?

    Solution

    Explanation:

    On burning of fossil fuels carbon dioxide gas is produced along with heat and light.

     

  • Question 8
    1 / -0

    Mountaineers carry oxygen ______________ with them, while climbing mountains.

    Solution

    Explanation:

    As we climb higher altitude the air pressure and oxygen content in the air reduces. To avoid suffocation at higher altitude Mountaineers carry oxygen cylinder with them.

     

  • Question 9
    1 / -0

    A gas used for wielding purpose is

    Solution

    Explanation:

    Pure oxygen is mixed with acetylene for welding purpose. the mixture of oxygen and acetylene is very hot and produces very high temperature which is used for welding purpose.

     

  • Question 10
    1 / -0

    A weather cock show the ___________ in which wind is blowing.

    Solution

    Explanation:

    A weather cock shows the direction in which wind is blowing. It is also called as weather vane or wind vane.

     

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