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ECAT Pre General Science Physics Chapter 18 Electronics Online Test MCQs With Answers
Question # 1
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 # 2
The value of LDR depends upon intensity of:
Choose an answer
Sound falling on it
Current passing through it
Magnetic field surrounding it
Light falling on it
Non of these
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Question # 3
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 # 4
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 # 5
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 # 6
Most of the electrons in the base of an NPN transistor flow
Choose an answer
Out of the base lead
Into the collector
Into the emit
Into the base supply
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Question # 7
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 # 8
.Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 9
Silicon is one of the mot commonly used:
Choose an answer
onductor
Dielectric
Insulator
Semiconduction
Both (B) and (C)
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Question # 10
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 # 11
To display a digit of EIGHT, the number of ON LED'S are:
Choose an answer
Two
Three
Five
Seven
Eight
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Question # 12
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 # 13
A potential barrier of 0.7 V exists across p-n junction made from:
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Germanium
Silicon
Arsenic
Gallium
Indium
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Question # 14
Field lines are closer to each other in the region where the filed is
Choose an answer
Stronger
Weaker
Much weaker
Absent
None of these
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Question # 15
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 # 16
The values 1 and 0 are designated as:
Choose an answer
Continuous values
Binary values
Boolean values
Decimal values
Either (B) and (C)
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Question # 17
If the distance between two charges is doubled, the force between them will become
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Double
Half
Three times
One fourth
One third
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Question # 18
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 # 19
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 # 20
A transistor has:
Choose an answer
One region
Two regions
Three regions
Four regions
None is correct
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Question # 21
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 # 22
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 # 23
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 # 24
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 # 25
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 # 26
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 # 27
Inverter is the name given to:
Choose an answer
NOT gate
OR gate
NOR gate
AND gate
XOR gate
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