16. In p-type semiconductor, there are—

1. 1. No majority carriers

   
   
   

   2. Electrons as majority carriers

   
   
   

   3. Immobile positive ions

   
   
   

   4. Immobile negative ions

   
   
   

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   NA

   Correct Option: D

   NA

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17. The order of concentration of acceptor atoms created by isolations diffusion in monolithic IC for regions between the isolation islands is—

1. 1. 10²⁰ cm^–3

   
   
   

   2. 10²⁵ cm^–3

   
   
   

   3. 10¹⁵ cm^–3

   
   
   

   4. 10¹⁰ cm^–3

   
   
   

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   NA

   Correct Option: A

   NA

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18. Dynamic resistance of a diode varies as—

1. 1. I^–2

   
   
   

   2. I^–1

   
   
   

   3. I

   
   
   

   4. I²

   
   
   

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1. View Hint View Answer Discuss in Forum

   Dynamic resistance of a diode varies as
   

   γf =	nVT
   	I

   
   i.e.

   γf =	1
   	I

   
   or γf varies as I^–1

   Correct Option: B

   Dynamic resistance of a diode varies as
   

   γf =	nVT
   	I

   
   i.e.

   γf =	1
   	I

   
   or γf varies as I^–1

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19. The switching speed of pn-junction depends primarily on—

1. 1. Mobility of majority carriers in n-region

   
   
   

   2. Mobility of minority carriers in p-region

   
   
   

   3. Lifetime of minority carriers in p-region

   
   
   

   4. Lifetime of minority carriers in n-region

   
   
   

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   The switching speed of pn-junction depends primarily on lifetime of minority carriers in n-region.

   Correct Option: D

   The switching speed of pn-junction depends primarily on lifetime of minority carriers in n-region.

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20. For a forward biased pn-junction diode diffusion capacitance varies—

1. 1. Linearly with current

   
   
   

   2. Square of current

   
   
   

   3. Inversely with current

   
   
   

   4. Does not vary with current

   
   
   

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1. View Hint View Answer Discuss in Forum

   For a forward biased pn-junction diode diffusion capacitance varies linearly with current.

   Correct Option: A

   For a forward biased pn-junction diode diffusion capacitance varies linearly with current.

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