SEMICONDUCTOR

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

• diode

• semiconductor

• conductor

• insulator

• superconductor

These are the characteristics of pentavalent impurities except

• •5 valence electron.

• •contributing extra free electrons.

• •produce n-type semiconductors.

• •produce p-type semiconductors.

These are the characteristics of Trivalent impurities except

• •3 valence electrons

• •produce p-type semiconductors

• •producing a "hole".

• Boron, aluminium and gallium are the examples.

• Antimony, arsenic, and phosphorus are the examples

The process of adding an impurity to an intrinsic semiconductor is called

• Doping

• Ionization

• Recombination

• Atomic modification

The minority carriers in P-type silicon are called _________________

• Neutron

• Proton

• Electron

• Hole

A semiconductor has generally ……………… valence electrons.

• 2

• 3

• 6

• 4

When a pentavalent impurity is added to a pure semiconductor, it becomes ………

• An insulator

• An intrinsic semiconductor

• p-type semiconductor

• n-type semiconductor

The battery connections required to forward bias a pn junction are ……

• +ve terminal to p and –ve terminal to n

• -ve terminal to p and +ve terminal to n

• -ve terminal to p and –ve terminal to n

• None of the above

With forward bias to a pn junction , the width of depletion layer ………

• Decreases

• Increases

• Remains the same

• None of the above

The battery connections required to reverse bias a pn junction are ……

• +ve terminal to p and –ve terminal to n

• -ve terminal to p and +ve terminal to n

• -ve terminal to p and –ve terminal to n

• +ve terminal to p and +ve terminal to n