1. p-type semiconductor as a whole—

1. 1. Positively charged

   
   
   

   2. Negatively charged

   
   
   

   3. Electrically neutral

   
   
   

   4. Half of it positively charged and rest half negatively charged

   
   
   

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   p-type semiconductor as a whole electrically neutral.

   Correct Option: C

   p-type semiconductor as a whole electrically neutral.

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2. Current density in a conducting media is—

1. 1. J = nqµ

   
   
   

   2. J = σE a

   
   
   

   3. J = nµ E

   
   
   

   4. J = nqε
      

   
   
   

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   NA

   Correct Option: B

   NA

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3. The germanium transistors are seldom used above—

1. 1. 60ºC

   
   
   

   2. 75ºC

   
   
   

   3. 175ºC

   
   
   

   4. 125ºC

   
   
   

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   The germanium transistors are seldom used above 75°C because in germanium leakage current is very large and it is increases tremendously for higher temperature.

   Correct Option: B

   The germanium transistors are seldom used above 75°C because in germanium leakage current is very large and it is increases tremendously for higher temperature.

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4. In n-type semiconductor, there are—

1. 1. J = nqµ

   
   
   

   2. J = σE a

   
   
   

   3. J = nµ E

   
   
   

   4. J = nqε
      

   
   
   

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   NA

   Correct Option: C

   NA

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5. Which of the following statement is not true for a hole?

1. 1. Holes may constitute an electric current

   
   
   

   2. Holes can be considered as a net positive charge

   
   
   

   3. Holes can exist in any material including conductors

   
   
   

   4. Holes can exist in certain semiconductor materials only
      

   
   
   

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   NA

   Correct Option: C

   NA

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