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12th West Bengal Board
IMPORTANT
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The main difference between conductor, semiconductor and insulator is

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Important Questions on Electronic Devices

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 10
The temperature coefficient of resistance of a semiconductor
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 11
In p-type semiconductors, current conduction is due to
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 12

If nh and ne be the number density of holes and free electrons respectively, then

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 13

Copper and silicon are cooled from 300 K to 60 K, the specific resistance

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 14
At 0 K, an intrinsic semiconductor behaves as a-
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 15
In a p-n junction diode not connected to any circuit
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 16
The forbidden energy gap of Ge is 0.72 eV. Given, hc=12400 eV-Å  The maximum wavelength of radiation that will generate electron-hole pair is
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 17
An ideal crystal diode behaves in forward bias as a perfect-