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In semiconductor at a room temperature …...

In semiconductor at a room temperature ………

A

the conduction band is completely empty.

B

the valence band is partially empty and the conduction band is partially filled.

C

the valence band is completely filled and conduction band is partially filled.

D

the valence band is completely filled.

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The correct Answer is:
C
the valence band is completely filled and conduction band is partially filled.
At `0^(@)K` conduction band is empty and valence band is filled. At this temperature the conduction electrons do not move to valence band, but at the room temperature, group of electrons moves into conduction band from valence band [due to small forbidden gap (1eV)].
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KUMAR PRAKASHAN-SEMICONDUCTOR ELECTRONICS : MATERIALS, DEVICES AND SIMPLE CIRCUITS -Section-D : Multiple Choice Questions (MCQs) (MCQs asked in Competitive Exams)
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  5. The output of OR gate is 1 ……..

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  6. Choose the only false statement from the following.

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  7. Application of a forward bias to a p-n junction ………

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  8. Zener diode use for ….

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  9. An AND gate is followed by a NOT gate in series with two inputs A and ...

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  10. Justify the output waveform (Y) of the OR gate for the following input...

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  11. In a semiconducting material the mobilities of electrons and holes are...

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  12. A p-n photodiode is made of a material with a band gap of 2.0 eV. The ...

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  13. Obtain the resonant frequency and Q-factor of a series LCR circuit wit...

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  14. A gas in equilibrium has uniform density and pressure throughout its v...

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  15. A p-n photodiode is fabricated from a semiconductor with a band gap o...

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  16. Which one of the following statement is false?

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  17. Which of the following device acts a complete electronic circuit?

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  18. Which of the following statement is true for the forward bias of a p-n...

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  19. If a small amount of antimony is added to germanium crystal ………

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