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Physics Gk

Suitable impurities are added to a semiconductor depending on its use. This is done in order to

  • A
    increase its life
  • B
    enable it to withstand higher voltages
  • C
    increase its electrical conductivity
  • D
    increase its electrical resistivity
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On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

  • A
    mercury is a metal
  • B
    density of mercury is greater than that of water
  • C
    cohesion of mercury is greater than its adhesion with glass
  • D
    cohesion of water is greater than its adhesion with glass
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Sound of frequency below 20 Hz is called

  • A
    audio sounds
  • B
    infrasonic
  • C
    ultrasonic
  • D
    supersonics
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