CBSE  /  Class 10  /  Science  /  Electricity

  • 1. 
    The variable resistance is called

  • resistor
  • rheostat
  • open switch
  • none of these

  • 2. 
    The SI unit of resistance is

  • ohm m
  • ohm m
  • ohm
  • (ohm)

  • 3. 
    An electric iron draws a current 4 A when connected to a 220 V mains. Its resistance must be

  • 1000 Ω
  • 55 Ω
  • 44 Ω
  • None of these

  • 4. 
    The element used almost exclusively for filaments of incandescent lamps

  • copper
  • gold
  • silver
  • tungsten
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