Basic Electronics MCQ Questions and Answers

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Showing 10 of 29 questions
Q11
A piece of copper and other of germanium are cooled from the room temperature to 80K, then
  • A resistance of each will increase
  • B resistance of copper will decrease
  • C the resistance of copper will increase while that of germanium will decrease
  • D the resistance of copper will decrease while that of germanium will increase
Answer: Option D
Q12
Diamond is very hard because ?
  • A it is covalent solid
  • B it has large cohesive energy
  • C high melting point
  • D insoluble in all solvents
Answer: Option B
Q13
The part of the transistor which is heavily doped to produce large number of majority carriers is
  • A emitter
  • B base
  • C collector
  • D any of the above depending upon the nature of transistor
Answer: Option A
Q14
An Oscillator is nothing but an amplifier with
  • A positive, feedback
  • B negative feedback
  • C large gain
  • D no feedback
Answer: Option A
Q15
When a P-N junction diode is reverse biased the flow of current across the junction is mainly due to
  • A diffusion of charge
  • B drift charges
  • C depends on the nature o material
  • D both drift and diffusion of charges
Answer: Option B
Q16
Which of the following, when added as an impurity, into the silicon, produces n-type semi conductor
  • A Phosphorous
  • B Aluminium
  • C Magnesium
  • D both ‘b’ and ‘c’
Answer: Option A
Q17
The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
  • A 0.29mA
  • B 0.35mA
  • C 0.39 mA
  • D 0.43 mA
Answer: Option A
Q18
When a n-p-n transistor is used as an amplifier then ?
  • A the electrons flow from emitter to collector
  • B the holes flow from emitter to collector
  • C the electrons flow from collector to emitter
  • D the electrons flow from battery to emitter
Answer: Option A
Q19
When arsenic is added as an impurity to silicon, the resulting material is?
  • A n-type semiconductor
  • B p-type semiconductor
  • C n-type conductor
  • D Insulator
Answer: Option A
Q20
To obtain a p-type germanium semiconductor,it must be doped with ?
  • A arsenic
  • B antimony
  • C indium
  • D phosphorus
Answer: Option C

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