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Which of the following statements is/are...

Which of the following statements is/are correct ?

A

Silicon doped with boron is an n-type semiconductor

B

Silicon doped with arsenic is p-type semiconductor

C

Metal are good conductor of electricity

D

Electrical conductivity of semiconductor decreases with increasing temperature

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The correct Answer is:
C
Metals are good conductors of electricity due to the presence of free electrons .
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-SOLID STATE-EXERCISE 1
  1. Copper crystallises in fcc with a unit cell length of 361 pm. What is ...

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  2. Sodium crystallises in bcc arrangement with the interfacial separation...

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  3. Which of the following point defects are shown by AgBr (s) crys...

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  4. Due to schottky defect the density of the crystal A… whereas due to fr...

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  5. The flame colours of metal ions are due to

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  6. When electrons are trapped into the crystalline anion vacancy the def...

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  7. Which is the wrong statement regarding a crystal containing Schottky d...

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  8. What type of crystal defect is indicated in the diagram below ?

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  9. The n-type semiconductor is obtained when Si is doped with

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  10. An element of group 13, if added in small amounts to Ge……is formed

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  11. Insulators are the solid with very low conductivities ranging between ...

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  12. A… is called introducing a defect in a crystal by adding impurity. Her...

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  13. Which of the following is a ferroelectric compound?

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  14. Electrical conductivity of semiconductor A… with rise in temperature ....

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  15. …..A …. And B…. Are the example of intrinsic semiconductors . Here , A...

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  16. The substances , which shows permanent magnetism even in the absence o...

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  17. If we mix a pentavalent impurity in the crystal lattice of germinium t...

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  18. Which of the following statements is/are correct ?

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  19. Which of the following has the highest value of energy gap ?

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  20. Electrons in a paramagnetic compound are

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