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Silicon is a semiconductor. If a small a...

Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity

A

Decreases

B

Increases

C

Remains unchanged

D

Becomes zero

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • If a small amount of antimony is added to germanium crystal

    A
    Its resistance is increased
    B
    It becomes a p-type semiconductor
    C
    The antimony becomes an acceptor atom
    D
    There will be more free electrons than holes in the semiconductor

  • If a small amount of antimony is added to germanium crystal

    A
    the antimony becomes an acceptor atom
    B
    there will be more free electrons than holes in the semiconductor
    C
    its resistance is increased
    D
    it becomes a `p`-type semiconductor

  • Small amount of iodine is added to common salt to that

    A
    Oedema is prevented
    B
    Common salt is utilised properly in the body
    C
    Occurance of goitre is prevented
    D
    Kidney remains efficient in maintaining water balance
    • AAKASH INSTITUTE-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, solar cell, the value of photoelectromotive force p...

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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 n-p-n transistor is used as an amplifier

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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 3V for an input of 0.01 ...

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    17. In a common emitter amplifier, the phase difference between the input ...

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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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