Class VIII

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
In a LED , the longer lead/leg is connected to _ 
  1. Positive terminal of the battery 
  2. Negative terminal of the battery 
  3. Either positive of negative terminal of the battery 
  4. None of these 
An electrolyte is
  1. a metal
  2. a solution
  3. a liquid that conducts current
  4. all of above
In a LED, the longer lead/leg is connected to ____________
  1. positive terminal of the battery
  2. negative terminal of the battery
  3. either positive of negative terminal of the battery
  4. none of these
Most liquids that conduct electricity are solutions of _ 
  1. Acids 
  2. Dases 
  3. Salts 
  4. All of these 
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