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Carbon , silicon and germanium have four...

Carbon , silicon and germanium have four valence electrons each . At room temperature which one of the following statements is most appropriate ?

A

The number of free conduction electrons is negligibly small in all the three

B

The number of free conduction electrons for conduction is significant in all the three

C

The number of free electrons for conduction is significant only in Si and Ge but small in C

D

The number of free electrons for conduction is significant in C but small in Si and Ge

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The correct Answer is:
C
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AAKASH INSTITUTE ENGLISH-SEMICONDUCTOR ELECTRONICS: MATERIALS, DEVICES AND SIMPLE CIRCUITS-Assignment (Section -A (Objective Type question (One option is correct))
  1. Silicon is a semiconductor. If a small amount of As is added to it, th...

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  2. The mobility of free electrons is greater then that of free holes beca...

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  3. Carbon , silicon and germanium have four valence electrons each . At r...

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  4. Which circuit will not show current in ammeter ?

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  5. A p-n photodiode is made of a material with a band gap of 2 e V. The m...

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  6. Zener breakdown takes place if

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  7. In the depletion region of an unbiased p-n junction diode there are

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  8. Function of rectifier is

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  9. In a p–n junction photo cell, the value of the photo electromotive for...

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  10. Serious draw back of the semiconductor device is

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  11. The reason of current flow in P-N junction forward biase is

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  12. In the energy band diagram of a material shown below, the open circles...

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  13. An oscillator is nothing but an amplifier with

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  14. When a n-p-n transistor is used as an amplifier, then

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  15. If l(1),l(2),l(3) are the lengths of the emitter, base and collector o...

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  16. A common emitter amplifier gives an output of 3 V for an input of 0.01...

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  17. In a common base amplifier the phase difference the input signal volta...

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  18. In a common emitter amplifier the input signal is applied across

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  19. The concentration of impurities in a transistor is

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  20. In a transistor, the collector current is always · less then the emitt...

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