CBSE  /  Class 8  /  Science  /  Chemical Effects of Electric Current

  • 1. 
    of the following is a bad conductor of electricity?

  • Distilled water
  • Silver nitrate
  • Sulphuric acid
  • Copper sulphate

  • 2. 
    Which of the following does not conduct electricity?

  • Sugar solution
  • Vinegar solution
  • Lemon juice solution
  • Caustic soda solution

  • 3. 
    An electric current can produce

  • heating effect
  • chemical effect
  • magnetic effect
  • all of these

  • 4. 
    Pure or distilled water is a

  • poor conductor
  • good conductor
  • both (a) and (b)
  • none of these

  • 5. 
    Which of the following is a good conductor?

  • Brick
  • Steel
  • Plastic
  • Cotton

  • 6. 
    Polythene is

  • a conductor
  • an insulator
  • both (a) and (b)
  • none of these

  • 7. 
    Electroplating is based on

  • heating effect of electricity
  • chemical effect of electricity
  • physical effect of electricity
  • magnetic effect of electricity

  • 8. 
    Copper is

  • a good conductor
  • an insulator
  • both (a) and (b)
  • none of these

  • 9. 
    Waste from an electroplating factory must be disposed off

  • in the nearby river
  • in the nearby pond
  • in the nearby cornfield
  • according to the disposal guidelines of Waste Management Bodies

  • 10. 
    An electrolyte is

  • a metal
  • a liquid that conducts current
  • a non-metal
  • none of these
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