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Published on: 23/05/2021
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Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test1.
In a npn transisitor circuit,the collector current is 10 mA. If 95 percent of the electrons emitted reach the collector,which of the following statements are true?
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
2.
Consider an npn transistor with its base emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
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
3.
When an electric field is applied across a semiconductor
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.
4.
Hole is
an anti-particle of electron
a vacancy created when an electron leaves a covalent bond
absence of free electron
an artificially created particle
5.
The conductivity of a semiconductor increases with increase in temperature because
number density of free current carriers increases
relaxation time increases
both number density of carriers and relaxation time increase
number density of carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
1.
(b)
The emitter current will be 10.53 mA
2.
(c)
Electrons move from emitter to base
3.
(a)
electrons move from lower energy level to higher energy level in the condition band
4.
(b)
a vacancy created when an electron leaves a covalent bond
5.
(d)
number density of carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
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