1. In an intrinsic semiconductor

1. 1. Only electrons are responsible for the blow of current

   
   
   

   2. Only holes are responsible for the blow of current

   
   
   

   3. Both holes and electrons carry current and their number is the same

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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2. In a transistor

1. 1. Length of emitter is greater than that of collector

   
   
   

   2. Length of collector is greater than that of emitter

   
   
   

   3. Both collector and emitter have the same length

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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3. In a transistor the emitter current is

1. 1. Slightly more than the collector current

   
   
   

   2. Slightly less than the collector current

   
   
   

   3. Equal to the collector current

   
   
   

   4. Equal to the base current

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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4. The electrical circuit used to get smooth DC output from a rectifier circuit is called

1. 1. Amplifer

   
   
   

   2. Filter

   
   
   

   3. Oscillator

   
   
   

   4. Full rectifier

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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5. If germanium has to be doped with a donor impurity, the foreign atom should be

1. 1. Tetravalent

   
   
   

   2. Pentavalent

   
   
   

   3. Trivalent

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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