number density of free current carriers increases

relaxation time increases

 both number density of carriers and relaxation time increase 

number density of current carriers increases , relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

an anti-particle of electron

a vacancy created when an electron leaves a covalent bond

absence of free electron

an artificially created particle

electrons move from lower energy level to higher energy level in the condition band

electrons move from higher energy level to lower energy level in the conduction band

holes in the valence band move from higher energy level to lower energy level

holes in the valence band move from lower energy level to higher energy level.

Electrons crossover from emitter to collector

Holes move from base to collector

Electrons move from emitter to base

Electrons from emitter move out of base without going to the collector

The entire current will be 8 mA

The emitter current will be 10.53 mA

The base current will be 2 mA

The base current will be 2 mA