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Semiconductors are manufactured by addit...

Semiconductors are manufactured by addition of impurities of

A

s-block elements

B

actinoids

C

lanthanoids

D

p-block elements

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The correct Answer is:
D
The semiconductors which are doped with Group 13 or Group 12 elements, they form p-type semiconductors. If they are doped with Group-15 and group 16 elements, they form n-type semiconductors. (`pto`positive i.e., holes are created, `nto`negative because of extra electrons).
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 06-PAPER 1 (PHYSICS & CHEMISTRY)
  1. In H(2)-O(2) fuel cell, the reaction occurring at cathode is

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  2. 2N(2)O(5)to4NO(2)+O(2). The rate of reaction in terms of N(2)O(5) will...

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  3. Semiconductors are manufactured by addition of impurities of

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  4. Select the correct statement.

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  5. Which of the following is incorrect match for hybridisation and geomet...

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  6. The first ionisation enthalpies of the lanthanoids are around (A), the...

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  7. The number of primary, secondary and tertiary carbons in 3,4-dimethylh...

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  8. Aliphatic aldehyde can be oxidised by

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  9. Equation of state is

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  10. The heat of combustion of solid benzoic acid at constant volume is -32...

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  11. For a cell given below Ag|Ag^(+)||Cu^(2+)|Cu Ag^(+)+e^(-)toAg,E^(@...

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  12. In the following redox reaction, xUO^(2+)+Cr(2)O(7)^(2-)+yH^(+)toaUO...

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  13. Iron is obtained on large scale from haematite Fe(2)O(3)

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  14. The element(s) of group-16 which exhibit(s) allotropy is/are

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  15. Pick out incorrect statements abou noble gases.

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  16. The atomic number of 5f series range from

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  17. The chloro compound which is used as a fire extinguisher is

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  18. Aldol condensation between following compounds, followed by dehydratio...

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  19. The compound with the highest boiling point is:

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  20. The solubility of Na(2),SO(4),BeSO(4),MgSO(4) and BaSO(4) will follow ...

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