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ECAT Physics Chapter 18 Electronics Online Test MCQs With Answers
Question # 1
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 # 2
A potential barrier of 0.7 V exists across p-n junction made from:
Choose an answer
Germanium
Silicon
Arsenic
Gallium
Indium
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Question # 3
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 # 4
To display a digit of EIGHT, the number of ON LED'S are:
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Two
Three
Five
Seven
Eight
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Question # 5
In AND gate, the output is 1 if:
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Both inputs are 0
Both inputs are 1
Only one input is 0
Both (A) and (B)
Both (A) and (C)
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Question # 6
If both the inputs given to a gate ae 1 such that the output is 0, then it is:
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AND gate
NOR gate
OR gate
NOT gate
Both (A) and (C)
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Question # 7
Majority charge carriers in the p-region of p-n junction are:
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electrons
positrons
Holes
Neutrons
None of these
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Question # 8
A potential barrier of 0.7V exists across p-n junction made from:
Choose an answer
Germanium
Silicon
Arsenic
Gallium
Indium
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Question # 9
In the text book, the transistor amplifier circuit is a:
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Common emitter circuit
Common collector circuit
Common base circuit
Any of these
None of these
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Question # 10
When transistors are used in digital circuits they usually operate in the
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Active region
Breakdown region
Saturation and cutoff regions
Linear region
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Question # 11
Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 12
A transistor has:
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One region
Two regions
Three regions
Four regions
None is correct
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Question # 13
In full wave rectification, simultaneous action is that:
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Two diodes conduct and two do not.
One diode conduct and three do not.
Three diodes conduct and one does not.
All the four diodes conduct
None of these
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Question # 14
Truth table of logic function:
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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 # 15
In the forward biases situation, the current flowing across the p-n junction is a few:
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amperes
Milli amperes
Micro amperes
Pico amperes
None of these
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Question # 16
All the valence electrons present in a crystal of silicon are bound in their orbits by
Choose an answer
Ionic bond
covalent bond
Molecular bond
Both (A) and (B)
Both (B) and (C)
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