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Air Test - 5

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  • Question 1
    1 / -0

    Directions For Questions

    Select the correct alternative from the given choices.

    ...view full instructions

    The characteristic type of rainfall in the equatorial region is
    Solution
    The conventional rainfall is prevalent in equatorial regions.  In these area the warm air rises up and expands. Then the warm air reaches at a cooler layer and saturates, then condenses in the form of cumulus clouds. In equatorial region, the precipitation due to convectional rainfall occurs in the afternoon.
    The correct option is B.
  • Question 2
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    As we go higher towards the atmosphere, the air becomes _______.
  • Question 3
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    The lower layer of the atmosphere is known as __________.
    Solution
    Troposphere,
    The troposphere is the lowest layer of the Earth's atmosphere. The air is very well mixed and the temperature decreases with altitude. Air in the troposphere is heated from the ground up. The surface of the Earth absorbs energy and heats up faster than the air does.
  • Question 4
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    The state of atmosphere over an area at any point of time is known as _____.
    Solution
    The state of atmosphere over an area at any point of time is known as Weather.
  • Question 5
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    The most abundant constituent of dry air in terms of volume is ________.

      Solution
      Nitrogen is important gas of which about 78% of the atmosphere's volume is made up. Nitrogen serves mainly as a diluent. It is relatively inactive chemically, though many of its compounds are very active. Its main function in the atmosphere is to regulate combustion by diluting oxygen. It also indirectly helps in oxidation of different kinds.
    1. Question 6
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      The fifth layer of Earth's atmosphere is __________.

        Solution
        The outermost layer of the earth's atmosphere is known as the exosphere which lies between 400 and 1000 kilometers. At such a great height the density of atoms in the atmosphere is extremely low. Hydrogen and helium gases predominate in this outermost region. At the outermost boundary of our atmosphere, the kinetic temperature may reach a fantastically high value of about 5568 degree Celsius. However, this temperature in its real sense is entirely different from the temperature at the earth's surface. 
      1. Question 7
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        The zone which separates the troposphere from stratosphere is______________.
        Solution
        The tropopause is the boundary region between the troposphere and the stratosphere. Measuring the temperature change with height through the troposphere and the stratosphere identifies the location of the tropopause. In the troposphere, temperature decreases with altitude.
      2. Question 8
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        The average daily weather for an extended period of time at a certain location is known as
        Solution
        The generalisation of the atmospheric condition over a long period of time is referred to as climate. It is the average daily weather for an extended time at a particular area. Weather pattern recorded for more than 30 years of a region is considered its climate. The important features of a climate are average temperature and precipitation.
      3. Question 9
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        Which one of the following is generally not considered a major element of weather and climate?
        Solution
        The state of atmosphere over an area at any point of time is known as weather. It is the state of the atmosphere over short periods of time. Weather can change from hour to hour, day to day, month to month or even year to year. Weather pattern recorded for more than 30 years of a region is considered its climate.

        Following are the major elements of weather and climate:-

        1. Precipitation
        2. Humidity
        3. Air temperature
        4. Air pressure
        5. Wind speed

      4. Question 10
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        In the Earth's atmosphere, the atmospheric pressure  ________.
        Solution

        As we go up the pressure decreases with altitude.

        This is because at higher altitudes number of air molecules present are low when compared to those that are present in the lower atmosphere.

        Moreover gravitational pull which is responsible for atmospheric pressure is low on the molecules that are away from its surface than those that are closer to it.

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