Semiconductor electronics

What bonds are present in a semiconductor?

• 1. Monovalent

• 1. Bivalent

• 1. Trivalent

• 1. Covalent

In a p-type semiconductor, the current conduction is due to

• 1. Holes

• 1. Atoms

• 1. Electrons

• 1. Protons

1. In intrinsic semiconductors at room temperature, the number of electrons and holes are

• 1. Unequal

• Equal

• Infinte

• Zero

What happens to the forbidden energy gap of a semiconductor with the fall of temperature?

• 2. Sometimes decreases and sometimes increases

• Decreases

• Unchanged

• Increases

Number of electrons in the valence shell of a pure semiconductor is

• 1

• 2

• 3

• 4

In a half wave rectifier, the r.m.s. value of the a.c. component of the wave is

• equal to d.c. value 

• less than d.c. value 

• more than d.c. value

• zero

When p-n junction diode is forward biased then

• both the depletion region and barrier height are reduced

• he depletion region is widened and barrier height is reduced

• the depletion region is reduced and barrier height is increased

• Both the depletion region and barrier height are increased

Forward biasing is that in which applied voltage

• increases potential barrier

• cancels the potential barrier

• is equal to 1.5 volt

• None of these

In an unbiased p-n junction, holes diffuse to the n-region from the p-region because

• free electrons in the n-region attract them.

• they move across the junction by the potential difference.

• hole concentration in the p-region is more as compared to the n-region.

• All of the above

A p-type semiconductor is

• 1. Positively charged

• 1. Negatively charged

• 1. Uncharged

• 1. None of the above