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Physics ECAT Pre Engineering Chapter 18 Electronics Physics Online Test MCQs With Answers
Question # 1
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 # 2
Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 3
The SI unit of charge is
Choose an answer
Ampere
Watt
Coulomb
Volt
Joule
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Question # 4
Inverter is the name given to:
Choose an answer
NOT gate
OR gate
NOR gate
AND gate
XOR gate
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Question # 5
Electric field strength is defined as
Choose an answer
Work done on unit charge
Force exerted on unit charge
Distance covered by unit charge
Power exerted by unit charge
None of these
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Question # 6
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 # 7
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 # 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
The number of LED'S needed to display all the digits is:
Choose an answer
Four
Five
Nine
Six
Seven
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Question # 10
To turn the transistor OFF, the base current is set:
Choose an answer
At maximum value
At zero
Either (A) or (B)
All are correct
None of correct
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Question # 11
A digital system deals with quantities which has discrete values:
Choose an answer
Two in number
One in number
Three in number
Four in number
None of these
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Question # 12
A transistor has:
Choose an answer
One region
Two regions
Three regions
Four regions
None is correct
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