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Physics Fsc Part 2 Chapter 7 Online Test MCQs With Answers
Question # 1
Reverse current flows due to
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Majority charge carriers
Minority charge carriers
Electrons
Holes
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Question # 2
The mathematical symbol for NOR operation is
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X = A . B
X = A + D
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Question # 3
The device which are required to convert various physical quantities into electric voltage are called.
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Filters
Rectifiers
Amplifiers
Sensors
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Question # 4
Minimum number of semi conductor diodes required for full wave rectification are.
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1
2
3
4
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Question # 5
The use of LDR is in the circuit of.
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Logic gate
Rectifier
Oscillator
High Switch
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Question # 6
Depletion region carries.
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-ve charge
+ve charge
Ions
No charge
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Question # 7
The semi conductor diode has the property of
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Two way conduction
Zero conduction
One way conduction
Amplification
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Question # 8
In a transistor, collector current is controlled by:
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Collector voltage
Base current
Collector resistance
All of the above
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Question # 9
Which component of the transistor has greater contrition of impurity.
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Base
Emitter
Collector
Emitter and collector
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Question # 10
In case of op-amp as an inverting amplifier, V
+
- V
-
= 0, this is because
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Open gain loop is very low
Closed loop gain is very high
Open loop gain is very high
Both (a) and (a)
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Question # 11
The sensor of light is.
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Transistor
LED
Diode
Light dependent resistance
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Question # 12
The average gap for Germanium at 0K is
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1.12 ev
0.02 ev
6.72 ev
7.2 ev
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Question # 13
A photo diode can turn its current ON and OFF in
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Micro seconds
Mega seconds
Nano seconds
Mili seconds
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Question # 14
The central region of a transistor is called.
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Emitter
Collector
Base
Neutral
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Question # 15
A device which converts low voltage or current to high voltage or current is called.
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Transformer
AC generator
Amplifier
Rectifier
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Question # 16
The device which is used as amplifier and works with the negative feedback is.
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Operational amplifier
P-n-p transistor
n-p-n transistor
Transistor
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Question # 17
The potential difference across the depletion region of germanium is.
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0.3 V
0.5 V
0.7 V
0.8 V
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Question # 18
An expression for gain of an inverting amplifier is
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(R
1
R
2
)
None of these
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