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Materials and Components - Engineering

Q1:

In a pure sample of silicon

A the number of holes and free electrons is always equal

B the number of free electrons is more than the number of holes

C the number of free electrons and holes is equal at low temperature

D the number of free electrons is less than number of holes

ANS:A - the number of holes and free electrons is always equal

Pure silicon is nothing but intrinsic semiconductor.

In intrinsic semiconductor number of electrons is equal to number of holes due to which no free electrons present no current conduction takes place in intrinsic semiconductors.