+2 Physics Unit 9. Semiconductor Devices And Their Applications
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Prepared by P. ILAIYARAJA M. Sc. ,B. Ed. , PG ASST IN PHYSICS , GHSS, PANCHANATHIKKULAM EAST, NAGAI DT. ; & www. Padasalai. Net
- 1.The electrons in the atom of an element which determine its chemical and electrical properties are called
- A.
Valence electrons
- B.
Revolving electrons
- C.
Excess electrons
- D.
Active electrons
- 2.In an N−type semiconductor, there are
- A.
immobile positive ions
- B.
Immobile negative ions
- C.
Holes as majority carriers
- D.
No minority carriers
- 3.The reverse saturation current in a PN junction diode is only due to
- A.
Minority carriers
- B.
Donor ions
- C.
Majority carriers
- D.
Acceptor ions
- 4.In the forward bias characteristic curve, a diode appears as
- A.
An ON switch
- B.
An OFF switch
- C.
A high resistance
- D.
A capacitor
- 5.Avalanche breakdown is primarily dependent on the phenomenon of
- A.
Collision
- B.
Recombination
- C.
Doping
- D.
Ionisation
- 6.The colour of light emitted by a LED depends on
- A.
Type of semiconductor material
- B.
The amount of forward current
- C.
Its forward bias
- D.
Its reverse bias
- 7.The emitter base junction of a given transistor is forward biased and its collector−base junction is reverse biased. If the base current is increased, then its
- A.
Ic will increase
- B.
Vcc will increase
- C.
Ic will decrease
- D.
VCE will increase
- 8.Improper biasing of a transistor circuit produces
- A.
Distortion in the output signal
- B.
Excessive heat at collector terminal
- C.
Faulty location of load line
- D.
Heavy loading of emitter current
- 9.An oscillator is
- A.
An amplifier with feedback
- B.
A convertor of ac to dc energy
- C.
Nothing but an amplifier
- D.
An amplifier without feedback
- 10.Since the input impedance of an ideal operational amplifier is infinite,
- A.
Its input current is zero
- B.
Its output resistance is high
- C.
its output voltage becomes independent of load resistance
- D.
it becomes a current controlled device
- 11.The following arrangement performs the logic function of ______ gate
- A.
OR
- B.
AND
- C.
EXOR
- D.
NAND
- 12.If the output (Y) of the following circuit is 1, the inputs A B C must be
- A.
101
- B.
110
- C.
010
- D.
100
- 13.
![According to the laws of Boolean algebra, the expression (A + AB)
is equal to
- ProProfs]( "According to the laws of Boolean algebra, the expression (A + AB)
is equal to")
According to the laws of Boolean algebra, the expression (A + AB) is equal to- A.
(4)
- B.
(3)
- C.
(2)
- D.
(1)
- 14.
![The Boolean expression ABC can be simplified as
- ProProfs]( "The Boolean expression ABC can be simplified as")
The Boolean expression ABC can be simplified as- A.
(4)
- B.
(3)
- C.
(2)
- D.
(1)
- 15.In a Colpitt’s oscillator circuit
- A.
Capacitive feedback is used
- B.
Tapped coil is used
- C.
No tuned LC circuit is used
- D.
No capacitor is used
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