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Online Tests
ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
The amplifier which us used to perform mathematical operations electronically is known as
Choose an answer
calculator
OP-AMP
computer
any one of them
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Question # 2
At resonance, the impedance of RLC series circuit is
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Maximum
Zero
Minimum
Determinate
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Question # 3
At higher frequency of the alternating current, the capacitive reactance X
c
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Increases
Decreases
Remains the same
Increases only when the voltage increases
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Question # 4
The value of current gain of n-p-n transistor is of the order of
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tens
hundreds
thousands
ten thousands
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Question # 5
For normal operation of transistor, the batteries
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V
CC
is of much lower value than V
BB
V
CC
is of much higher value than V
BB
V
CC is equal to
V
BB
none of these
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Question # 6
A signal is amplified at the output without any change of phase, if it is applied at the
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inverting input
non-inverting input
at any of the input
none of these
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Question # 7
In series RC circuit when R=X
c
, then the phase angle is
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0
°
90
°
70
°
45
°
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Question # 8
If the value of C in a series RLC circuit is increased, the resonant frequency
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Is not affected
Increase
Remains the same
Decreases
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Question # 9
The power factor of resonant series circuit is
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1
0
-1
0.5
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Question # 10
If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
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Instantaneous value
RMS value
Value averaged over a cycle
Either (B) or (C)
Either (A) or (C)
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Question # 11
The R
1
= infinity and R
2
= 0, then the gain of non-inverting amplifier is
Choose an answer
zero
infinity
one
any one of these
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Question # 12
A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from
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2nd group
fourth group
fifth group
sixth group
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Question # 13
An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
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Decreases
Increases
Does not change
Momentarily goes to zero
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Question # 14
Electromagnetic waves transmit energy equal to
Choose an answer
1/2 mv
2
m
o
c
2
hf/c
hf
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Question # 15
If 250V is the RMS value of alternative voltage, then its peak value V
o
will be:
Choose an answer
353.5V
250V
175V
zero
400V
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Question # 16
During each cycle, alternating voltage reaches a peak value
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One time
Two times
Four times
A number of times depending on the frequency
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Question # 17
Chock consumes externally small
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Charge
Current
Power
Potential
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Question # 18
OP-AMP has the following input terminals
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one
two
three
four
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Question # 19
The most common source of alternating voltage is:
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Motor
Transformer
AC genrator
Both (A) and (C)
Both (A) and (B)
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Question # 20
When the pn-junction is connected reversed biased, its resistance is of the order of
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few ohms
few kilo-ohms
few mega-ohms
few mili-ohms
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