Class VIII

Which of the following substance is not a good conductor of electricity?
  1. copper
  2. aluminium
  3. rubber
  4. mercury
The liquid will conduct electric current in a circuit when the vessel id filled with _ . 
  1. Distilled water 
  2. Salt solution 
  3. Air 
  4. Helium 
The glowing of filament bulb is due to 
  1. Heating effect of electric current 
  2. Physical effect of electric current 
  3. Magnetic effect of electric current 
  4. Chemical effect of electric current  
An electric lamp glows due to
  1. Chemical effect
  2. Magnetic effect
  3. Heating effect
  4. None of these
Which of the following substance is not a good conductor of electricity ? 
  1. Copper 
  2. Aluminium 
  3. Rubber 
  4. Mercury 
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