UNIT 2 SPCM

A semiconductor is formed by ……… bonds.

• Covalent

• Electrovalent

• Co-ordinate

• None of the above

A semiconductor has ………… temperature coefficient of resistance.

• Positive

• Zero

• Negative

• None of the above

When a pure semiconductor is heated, its resistance ………….

• Goes up

• Goes down

• Remains the same

• Can't say

An n-type semiconductor is ………

• Positively charged

• Negatively charged

• Electrically neutral

• Infinite charge

A hole in a semiconductor is defined as …………….

• A free electron

• The incomplete part of an electron pair bond

• A free proton

• A free neutron

The random motion of holes and free electrons due to thermal agitation is called ……….

• Diffusion

• Pressure

• Ionisation

• None of the above

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ……….

• Remains the same

• Increases

• Decreases

• Infinite

The Fermi level in a p-semiconductor lies close to

• The top of the valence band

• The top of the conduction band

• The bottom of the valence band

• The bottom of the conduction band.

Electron-hole pairs are produced by

• Recombination

• Thermal energy

• Ionization

• Doping

The p-region has a greater concentration of __________ as compared to the n-region in a P-N junction.

• holes

• electrons

• both holes & electrons

• phonons