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Who discovered Diode Bulb ?

  • Henry Becquerel
  • Sir J.S. Fleming
  • Lee De Forest
  • Archemedes
Similar Questions :

1. Which instrument is used to determine the intensity of colours ?

  • Cathetometer
  • Chronometer
  • Colorimeter
  • Commutator

2. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."

  • Doppler's Effect
  • Newton's law of cooling
  • Kirchhoff's Law
  • Stefan's Law

3. The force which opposes the relative motion between different layers of liquid or gases is called

  • Critical Velocity
  • Streamline Flow
  • Terminal Velocity
  • Viscous Force

4. Which instrument is used to measure altitudes in aircraft's ?

  • Audiometer
  • Ammeter
  • Altimeter
  • Anemometer

5. Which instrument is used to record physical happenings at a distant place ?

  • Thermostat
  • Tonometer
  • Telemeter
  • Transponder
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