Electronics and Communication Engineering - Electronic Devices and Circuits

11. 

Before doping the semiconductor material is

A. dehydrated
B. heated
C. hardened
D. purified

Answer: Option D

Explanation:

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12. 

The atomic number of silicon is 14. It can be therefore concluded that

A. a silicon atom contains 14 protons
B. a silicon atom contains 14 neutrons
C. a silicon atom contains 14 electrons
D. all of the above

Answer: Option D

Explanation:

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13. 

X-rays cannot penetrate through a thick sheet of

A. wood
B. paper
C. lead
D. aluminium

Answer: Option C

Explanation:

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14. 

Ohmic range of metal film resistors is

A. 1 to 100 ohms
B. 10 to 1 K ohms
C. 100 to 1 M ohms
D. 100 to 100 M ohms

Answer: Option C

Explanation:

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15. 

The current density J, free electron mobility μn, hole mobility μp , magnitude of free electron and hole concentration ni electric field E and charge on electron e, in intrinsic semiconductor are related as

A. J = (μn + μp)eniE
B. J =
C. J =
D. J =

Answer: Option A

Explanation:

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