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 is filled with _________.
  1. distilled water
  2. salt solution
  3. air
  4. helium
The whole apparatus of electrodes, electrolytes and vessel containing them is called _____
  1. thermometer
  2. electrometer
  3. voltameter
  4. ammeter
The whole apparatus of electrodes, electrolytes and vessel containing them is called _ 
  1. Thermometer 
  2. Electrometer 
  3. Voltameter 
  4. Ammeter 
Adding common salt to distilled water makes it
  1. Good conductor
  2. Insulator
  3. No
  4. Both a and b
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