Q.41)-Who discovered the battery?
  • Faraday
  • Volta
  • Maxwell
  • Roentgen
Q.42)-What is the unit of electric power?
  • Watt
  • Volt
  • KWH
  • Ampere
Q.43)-Alternating current is converted into direct current by using
  • Transformer
  • Dynamo
  • Rectifier
  • Inverter
Q.44)-Fleming Right Hand rule is used to find the direction of
  • Alternating current
  • Direct current
  • Induced current
  • Original current
Q.45)-Instrument used to change the speed of electric fan
  • Amplifier
  • Regulator
  • Switch
  • Rectifier
Q.46)-Best liquid for the transformer core is
  • Stainless steel
  • Cast steel
  • Hard steel
  • Soft iron
Q.47)-Transformer is used for
  • To increase the A.C. voltage
  • To increase DC. Voltage
  • To convert Electric Energy into heat energy
  • To convert AC into DC.
Q.48)-The filament of electric bulb is made up of
  • Copper
  • Nichrome
  • Lead
  • Tungsten
Q.49)-For the filament of electric bulb tungsten is used because
  • It is a conductor
  • It is cheaper
  • It is malleable
  • Its melting point is very high
Q.50)-What is filled inside an electric bulb?
  • Nitrogen
  • Carbon dioxide
  • Argon
  • Oxygen