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Online Tests
ECAT Pre General Science Physics Chapter 18 Electronics Online Test MCQs With Answers
Question # 1
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 # 2
Whenever a covalent bond breaks, it creates:
Choose an answer
An electron
A hole
An electron-hole pair
A positron
All of these
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Question # 3
The concept of electric field theory was introduced by
Choose an answer
Michael Faraday
Newton
Dalton
Kepler
Einstein
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Question # 4
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 # 5
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 # 6
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 # 7
The intensity at a point due to a charge is inversely proportional to
Choose an answer
Amount of charge
Size of the charge
Distance between charge and the point
Square of the distance from the charge
None of these
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Question # 8
The reverse saturation current in a PN junction diode is only due to
Choose an answer
Majority carriers
Minority Carriers
Acceptor ions
Donor ions
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Question # 9
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 # 10
In the forward biases situation, the current flowing across the p-n junction is a few:
Choose an answer
amperes
Milli amperes
Micro amperes
Pico amperes
None of these
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Question # 11
A hole in p-type my be due to:
Choose an answer
Trivalent impurity
Breking of some covalent bond
Pentavalent impurity
Germanium
Either (A) or (B)
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Question # 12
In an N-type silicon, which of the following statement is true
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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 # 13
Computer chips are made from:
Choose an answer
Iron
Silicon
Helium
Stontium
Aluminium
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Question # 14
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 # 15
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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Question # 16
The electric field lines start from
Choose an answer
Positive charge
Negative charge
Either A or B
Neutron
An atom
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Question # 17
.Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 18
If both the inputs given to a gate ae 1 such that the output is 0, then it is:
Choose an answer
AND gate
NOR gate
OR gate
NOT gate
Both (A) and (C)
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Question # 19
By placing a dielectric in between the charges, the electrostatic force between them
Choose an answer
Is always reduced
Is always increased
Is not affected
Is increased one million times
None of these
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Question # 20
Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 21
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 # 22
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 # 23
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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Question # 24
The value of relative permittivity of different dielectrics are
Choose an answer
Equal
Different
Greater than one
Smaller than one
Both B and C
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Question # 25
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 # 26
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 # 27
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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