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ECAT Physics Chapter 18 Electronics Online Test MCQs With Answers
Question # 1
In full wave rectification, simultaneous action is that:
Choose an answer
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 # 2
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 # 3
Origin of the electric and the gravitational forces
Choose an answer
Was known in 1911 A.D.
Was known in 1811 A.D.
Was known in 1711 A.D.
is still unknown
Was known in 1611 A.D.
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Question # 4
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 # 5
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 # 6
Electric lines of force
Choose an answer
Intersect each other
Are always parallel
Are always anti-parallel
Never intersect
None of these
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Question # 7
An electronic computer is basically a vast arrangement of electronic switches which are made from
Choose an answer
Resistors
Transistors
N -type crystals
P-Type crystals
Capacitors
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Question # 8
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 # 9
In reverse-biased p-n junction, the reverse current is due to flow of:
Choose an answer
Minority charge carriers
Majority charge carriers
Free electrons from p to n-region
Holes from n to p-region
all are true except (B)
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Question # 10
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 # 11
A transistor has:
Choose an answer
One region
Two regions
Three regions
Four regions
None is correct
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Question # 12
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 # 13
Majority charge carriers in the p-region of p-n junction are:
Choose an answer
electrons
positrons
Holes
Neutrons
None of these
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Question # 14
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 # 15
In an N-type silicon, which of the following statement is true
Choose an answer
Electrons are majority carriers and trivalent atoms are the dopants
Electrons are minority carriers and pentavalent atoms are the dopants
Holes are minority carriers and pentavalent atoms are the dopants
Holes are majority carriers and trivalent atoms are the dopants
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Question # 16
To designate the voltage as low or 0 by a logic gate, the specified minimum value is:
Choose an answer
0.2 volt
0.8 volt
0 volt
2.0 volt
5.0 volt
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