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Pure silicon at zero K is:
1. An intrinsic semiconductor
2. An extrinsic semiconductor
3. A metal
4. An insulator

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Correct Answer - Option 4 : An insulator

Concept:

  • A pure semiconductor at 0 Kevin behaves as an insulator
  • When the temperature is raised above absolute zero more electrons are detached from the covalent bond
  • Thus, the electron-hole pairs are increased, when the temperature is raised
  • These free electrons and holes move in a random manner
  • When the electric field is applied across the semiconductor bar, it forces the randomly moving electron-hole pairs in its direction (field direction)
  • This causes a current flow in the circuit which is called drift current
  • In pure silicon, a major part of the drift current is due to free electrons because the mobility of electrons is greater than the mobility of holes

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