PN Junction Transistor -Multiple Choice Questions Quiz

Question 1: What type of semiconductor material forms the base region of a PN junction transistor?

(a) P-type
(b) N-type
(c) Intrinsic
(d) Extrinsic

Question 2: In a common-emitter configuration of a bipolar junction transistor (BJT), the input is applied to:

(a) Base
(b) Collector
(c) Emitter
(d) Both Base and Emitter simultaneously

Question 3: The majority carriers in the base region of an NPN transistor are:

(a) Electrons
(b) Holes
(c) Ions
(d) Photons

Question 4: Which of the following is a forward-biased junction in an NPN transistor?

(a) Base-emitter junction
(b) Base-collector junction
(c) Collector-emitter junction
(d) None of the above

Question 5: The main function of the collector region in a transistor is to:

(a) Emit electrons into the base region
(b) Provide mechanical support to the transistor
(c) Control the flow of majority carriers from the emitter
(d) Generate holes in the base region

Question 6: What is the primary cause of current amplification in a bipolar junction transistor?

(a) Minority carrier injection
(b) Majority carrier extraction
(c) Emitter-base voltage drop
(d) Impurity doping in the collector region

Question 7: In a PNP transistor, the majority carriers in the emitter region are:

(a) Electrons
(b) Holes
(c) Ions
(d) Photons

Question 8: The current flows in a bipolar junction transistor mainly due to:

(a) Electrons
(b) Holes
(c) Both electrons and holes
(d) Protons

Question 9: The cutoff region of a transistor corresponds to:

(a) Forward-biased base-emitter junction and reverse-biased base-collector junction
(b) Reverse-biased base-emitter junction and forward-biased base-collector junction
(c) Both junctions being forward-biased
(d) Both junctions being reverse-biased

Question 10: The region of operation of a transistor where both junctions are forward-biased is called:

(a) Cutoff region
(b) Saturation region
(c) Active region
(d) Inverse region

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Total score: /10

Answer key:

Question 1: a

Question 2: a

Question 3: b

Question 4: a

Question 5: c

Question 6: a

Question 7: b

Question 8: c

Question 9: d

Question 10: b