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Some Natural Phenomena Test - 12

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Some Natural Phenomena Test - 12
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Rub an empty ball pen refill on a polythene sheet and hold it on top of small pieces of paper. What will be your observation?
    Solution
    When refill is rubbed on polythene it acquires small electric charges. Due to presence of these charges, pieces of paper gets attracted.
  • Question 2
    1 / -0
    Fill in the blanks:

    During the development of a thunder-storm, the air currents move ________ while the water droplets move _______.
  • Question 3
    1 / -0
    On which principle does a seismograph work?
    Solution
    Seismograph works on the principle of inertia to measure the depth and force of earthquake. The sudden force of earthquake, makes the scale pointer to move and after the tremor, the pointer comes back to its initial position due to its inertia of rest.
  • Question 4
    1 / -0
    Accumulation of charges causes ________ in the clouds.
    Solution
    Lighting is caused because of accumulation of electric charges between the clouds.
    During a thunderstorm, the air currents move upwards while the water droplets move downward.
    These vigorous movements cause the separation of charges. This leads to the positive charges collect near the upper edges of the clouds and the negative charge accumulating near the lower edges of the clouds.
    There is an accumulation of positive charges near the ground also.
    Negative and positive charges meet, producing streaks of bright light and sound. We see streaks as lightning. The process is known as electric discharge. The process of an electric discharge between different clouds or between clouds and the earth causes lightning.
  • Question 5
    1 / -0
    Fill in the blank:

    ________ charges collect or accumulates near the lower edges of clouds.
    Solution
    The vigorous movements of air current and water droplets causes separation of charges. Negative charges gets accumulated near the lower edges of the clouds.
  • Question 6
    1 / -0
    Lightning is nothing but ________.
    Solution
    Lightning is a naturally occurring electric discharge during which two electrically charged regions, both in the atmosphere or one on the ground, cause a large transfer of electric charge. 

    This electric discharge happens due to the large magnitude of the accumulated charges between cloud particles and air. The air can no longer resist their flow and then charges are transferred to the earth or streaks on the ground in the form of lightning.
  • Question 7
    1 / -0
    Fill in the blank:

    _________ of charges on surfaces of clouds leads to lightning.
    Solution
    The large magnitude of the accumulated charges leads to the meeting of negative and positive charges producing bright light and sound i.e. lightning.
  • Question 8
    1 / -0
    Seismometers can record motions in ________ directions.
    Solution
    Seismometer devices are located in $$3$$ directions and work on the principle of inertia to catch the motions in all directions.
  • Question 9
    1 / -0
    Fill in the blank:

    _______ charges collect near the upper edges of the clouds.
    Solution
    The vigorous movements of air current and water droplets leads to separation of charges. The positive charges collect near the upper edges of the clouds and the negative charges accumulate near the lower edges.

  • Question 10
    1 / -0
    _________ was the first to discover that lightning is electric discharge.
    Solution
    Benjamin Franklin was the first to show that the lightning is electric discharge which is same as spark out of clothes during winter.
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