Physics miscellaneous

Physics miscellaneous

Easy Questions

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Physics miscellaneous
  1. A wire of resistance R is cut into ‘n’ equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be








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    Since R is directly proportional to length of the wire, when wire is cut into equal parts, then Resistance of each part = R/n When the wires are connected in parallel, then the equivalent resistance of combination is
    1/R2 = n/R + n/R + n/R ....n times
    or, 1/R2 = n2R
    or, R2 = R/n2

    Correct Option: D

    Since R is directly proportional to length of the wire, when wire is cut into equal parts, then Resistance of each part = R/n When the wires are connected in parallel, then the equivalent resistance of combination is
    1/R2 = n/R + n/R + n/R ....n times
    or, 1/R2 = n2R
    or, R2 = R/n2

  1. While ascending a hill, the driver of the vehicle keeps the gear ratio








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    While ascending a hill Gear Ratio should be “Either equal to or greater than 1?. Gear Ratio is the ratio between angular velocity of input gear to the angular velocity of output gear. It prevents the vehicle from stalling.

    Correct Option: D

    While ascending a hill Gear Ratio should be “Either equal to or greater than 1?. Gear Ratio is the ratio between angular velocity of input gear to the angular velocity of output gear. It prevents the vehicle from stalling.

  1. The word ‘insolation’ means








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    Insolation is the solar radiation that reaches the earth’s surface. It is measured by the amount of solar energy received per square centimeter per minute. Insolation affects temperature. The more the insolation, the higher is the temperature.

    Correct Option: B

    Insolation is the solar radiation that reaches the earth’s surface. It is measured by the amount of solar energy received per square centimeter per minute. Insolation affects temperature. The more the insolation, the higher is the temperature.

  1. Light year is a unit of








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    A light-year is a unit of length used informally to express astronomical distances. It is equal to just under 10 trillion kilometres.

    Correct Option: C

    A light-year is a unit of length used informally to express astronomical distances. It is equal to just under 10 trillion kilometres.

  1. The device used to convert solar energy into electricity is








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    Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.

    Correct Option: A

    Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.