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    Physics
    Grade-9
    Easy

    Question

    Which of the following is NOT exhibited by a rotating fan?

    1. Circular motion
    2. Rotatory motion
    3. Periodic motion
    4. Rectilinear motion

    Hint:

    Oscillatory motion is the to and fro motion of a particle which is repeated over a fixed interval of time.

    The correct answer is: Rectilinear motion

      The blades of the fan describe the circular motion. During the rotation, the different particles repeat their motion about a certain point, in a fixed interval of time, exhibiting periodic motion.

      Oscillatory motion is the to and fro motion of a particle which is repeated over a fixed interval of time.
      Fan does not shows oscillatory motion.It shows periodic motion not oscillatory motion.
      Fan does not shows to and fro position about a mean position.

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      In the developing world, 1.1 billion people still do not have access to safe drinking water, 2.6 billion do not have access to adequate sanitation services, and waterborne diseases are responsible for more than 1.6 million deaths each year (mostly in children under five). Water is often too expensive or inaccessible to the poorest members of society in developing countries, while the wealthy have it piped into their homes. Furthermore, due to the infrastructure used to control water, entire seas are being lost, rivers are drying up, millions of people have been displaced to make room for reservoirs, groundwater aquifers are being pumped down, and water disputes have raised tensions from local to international levels. Fresh water is a scarce resource in many parts of the world, and it is expected to become even more so as the twenty-first century progresses.

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