31. Fermi level for an n-type semiconductor lies—

1. 1. Near valence band

   
   
   

   2. Near conduction band

   
   
   

   3. In valence band

   
   
   

   4. In conduction band

   
   
   

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   Fermi level for an n-type semiconductor lies near conduction band.
   

   Correct Option: B

   Fermi level for an n-type semiconductor lies near conduction band.

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32. Fermi level for an intrinsic semiconductor lies—

1. 1. Near valence band

   
   
   

   2. Near conduction band

   
   
   

   3. Middle of valence and conduction band

   
   
   

   4. Can lies anywhere

   
   
   

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   Fermi level for an intrinsic semiconductor lies middle of valence and conduction band.

   Correct Option: C

   Fermi level for an intrinsic semiconductor lies middle of valence and conduction band.

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33. 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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34. 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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35. 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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