HSSC-II (Class-12) Solved Physics MCQs; Unit-17: Electronics; (New Book/KPK Text Board, Peshawar) With Verified Answers

1. In N-type silicon, which of the following statement is true

A. Electrons are the majority carriers and trivalent atoms are the dopants.
B. Electrons are minority carriers and pentavalent atoms are the dopants
C. Holes are minority carriers and pentavalent atoms are the dopants.
D. Holes are the majority carriers and trivalent atoms are the dopants.

... Answer is C. Holes are minority carriers and pentavalent atoms are the dopants.
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2. The barrier potential of silicon diode at room temperature is.

A. 0.3 V
B. 0.7 V
C. 0.9 V
D. 1.0 V

... Answer is B. 0.7 V
----------------------

3. The width of the depletion region of a junction

A. Increases under forward bias
B. Is Independent of applied voltage
C. Increases under reverse bias
D. Remains same

... Answer is C. Increases under reverse bias
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4. For common emitter configuration of NPN transistor current gain is given by

A. `\I_C`/`\I_B`
B. `\I_C`/`\I_E`
C. `\I_E`/`\I_B`
D. `\I_B`/`\I_E`

... Answer is A. `\I_C`/`\I_B`
--------------------------------

5.  The reverse saturation current in a PN junction diode is only due to

A. majority carriers
B. minority carriers
C. acceptor ions
D. donor ions

... Answer is B. minority carriers
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6. PN junction when reversed biased act as:

A. Capacitor
B. ON switch
C. Inductor
D. OFF Switch

... Answer is D. OFF Switch
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7. Improper biasing of a transistor circuit produces :

A. Heavy loading of emitter current
B. Distortion in the output signal
C. Excessive heat at the collector terminal
D. Faulty location of load line

... Answer is B. Distortion in the output signal
--------------------------

8. When transistors are used in digital circuits they usually operate in the:

A. Active region
B. Breakdown region
C. Saturation and cutoff regions
D. linear region

... Answer is C. Saturation and cutoff regions
-------------------------

9. Most of the electrons in the base of an NPN transistor flow:

A. out of the base lead
B. into the collector
C. into the emitter
D. into the base supply

... Answer is B. into the collector
------------------------

10. In a transistor, the collector current is controlled by:

A. Collector voltage
B. base current
C. Collector resistance
D. all of the above

... Answer is B. base current
----------------------

11. The minimum number of diodes required for full wave rectification is

A. 3
B. 4
C. 2
D. 1

... Answer is C. 2
------------------------------

12. In a transistor both collector-base and base-emitter junctions are reverse-biased then it is

A. Active region
B. Cutoff region
C. Saturation region
D. Q-point

... Answer is B. Cutoff region
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