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General Knowledge :: Physics

  1. Ohm's law is valid in case of

  2. A.

     Semiconductor

    B.

     Conductor

    C.

     Superconductor

    D.

     Insulator


  3. Electrical burns occur principally because of

  4. A.

     Radiation pulses of the electricity

    B.

     The heat generated by the flow of electrical current through the body

    C.

     The high energy of electrons

    D.

     All of the above


  5. The SI unit of resistance is:

  6. A.

     Newton

    B.

     Coulomb

    C.

     Ohm

    D.

     Joule


  7. Electrical Energy is the energy of

  8. A.

     Protons

    B.

     Neutrons

    C.

     Electrons

    D.

     All the above


  9. As water is cooled from 4 deg C to 0 deg C, its density

  10. A.

     Increases

    B.

     Decreases

    C.

     Remains same

    D.

     None of the above


  11. Fish and other aquatic creatures can live inside a deep frozen pond because

  12. A.

     Fish are cold-blooded animals

    B.

     Ice is a bad conductor of heat

    C.

     There will always be water just beneath the ice level

    D.

     They can adapt themselves to live in ice


  13. The density of a gas is maximum at

  14. A.

     Low temperature, low pressure

    B.

     Low temperature, high pressure

    C.

     High temperature, low pressure

    D.

     High temperature, high pressure


  15. Lakes freeze in cold countries in winter, leaving the water underneath at

  16. A.

     0°C

    B.

     0°F

    C.

     4°C

    D.

     4°F


  17. A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated, it will

  18. A.

     Remain straight

    B.

     Bend towards right

    C.

     Bend towards left

    D.

     None of these


  19. Thermal expansion of materials arises from

  20. A.

     Strong bonds

    B.

     Thermal vibrations

    C.

     Weak bonds

    D.

     Asymmetry of potential energy curve