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ECAT Physics Chapter 18 Electronics Online Test MCQs With Answers
Question # 1
An LED emits light when it is:
Choose an answer
Forward biased
Reverse biased
Operated without battery
Operated with heat source
None of these
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Question # 2
When transistors are used in digital circuits they usually operate in the
Choose an answer
Active region
Breakdown region
Saturation and cutoff regions
Linear region
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Question # 3
Silicon is one of the mot commonly used:
Choose an answer
onductor
Dielectric
Insulator
Semiconduction
Both (B) and (C)
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Question # 4
Truth table of logic function:
Choose an answer
Summarizes its output values
Tabulates all its input conditions only
Display all its input/output possibilites
Is not based on logic algebra
None of these
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Question # 5
If the distance between two charges is doubled, the force between them will become
Choose an answer
Double
Half
Three times
One fourth
One third
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Question # 6
A diode which can turn its current ON and OFF in nono seconds is called:
Choose an answer
LED
Photodiode
An ordinary diode.
Both (A) and (B)
Both (B) and (C)
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Question # 7
The number of input terminals of an op-amp is:
Choose an answer
One
Two
Three
Four
None of these
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Question # 8
In a transistor, collector current is controlled by
Choose an answer
Collector voltage
Base current
Collector resistance
All of the above
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Question # 9
.Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 10
To make an LED, it is impreacticable to use:
Choose an answer
Silicon
Gallium arsenide
Gallium arsenide phosphide
Iron
Both (B) and (C)
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Question # 11
In describing function of digital systems, 1 represents:
Choose an answer
Closed switch
True Statement
Lighted bulb
Only (B) and (C)
All are true
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Question # 12
Conversion of A.C. into D.C. is called:
Choose an answer
Reftification
Amplification
Electric induction
Magnetic induction
None of these
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Question # 13
Crystal of germanium or silicon in its pure form at absolute zero acts as:
Choose an answer
A conductor
A semiconductor
an insulator
Both (A) and (C)
Both (A) and (B)
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Question # 14
The use of chips in electrons is described in the form of:
Choose an answer
Yellow boxes
Black boxes
Red boxes
White boxes
Orange boxes
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Question # 15
Electric intensity at a place due to a charged conductor is a
Choose an answer
Scalar quantity
Vector quantity
Semi vector and semi scalar
Dimensionless quantity
Both A and D are true
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