Multiple choice

Which of the following statements is/are FALSE?

  1. The conductance of metals decreases with an increase in temperature.
  2. p-type of conduction is observed in compounds like Fe1-YO and Fe1-YS.
  3. Extrinsic semiconductors are semiconductors due to thermal defects.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Intrinsic semiconductors are semiconductors due to thermal defects. At 0 K, pure Si or Ge acts as insulator, however, at higher temperatures, some of the covalent bonds are broken and the electrons so released become free to move in the crystal and thus, conduct electricity. Extrinsic semiconductors are semiconductors due to impurity defects. 

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