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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
Choose an answer
photo diode
light emitting diode
photo voltaic cell
all of them
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Question # 2
The bridge circuit of full wave rectification uses
Choose an answer
one diode
two diode
three diode
four diode
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Question # 3
The alternative voltage of current is actually measured by:
Choose an answer
Its RMS value
Square root of its mean square value
Instantaneous value
Peak value
Both (A) and (B)
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Question # 4
The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
Choose an answer
I
c
will decrease
V
CE
will increase
I
C
will increase
V
CC
will increase
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Question # 5
In RLC series circuit, resonance occurs when
Choose an answer
X
L > Xc
X
L < Xc
X
L = Xc
None of these
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Question # 6
The total reactance of a series RLC circuit at resonance is
Choose an answer
zero
Equal to the resistance
Infinity
Capacitive
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Question # 7
Most OP-AMP operates with
Choose an answer
+
6 V supply
+
10 V supply
+
12 V supply
+
24 V supply
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Question # 8
In half wave rectification
Choose an answer
both halves of the input voltage is used
only one half of the input voltage is used
either of these
none of these
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Question # 9
To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
Choose an answer
5.07 pF
50 pF
0.507 pF
507 pF
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Question # 10
A sinusoidally alternating voltage or current can be graphically represented by a:
Choose an answer
Vector
Rotating vector
Clockwise vector
Anticlockwise voltage vector
None of these
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Question # 11
At resonance, the impedance of RLC series circuit is
Choose an answer
Maximum
Zero
Minimum
Determinate
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Question # 12
The input resistance of the OP-AMP is the resistance between the
Choose an answer
(-) input and output
(+) input and output
(-) and (+) inputs
between any inputs
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Question # 13
Peak value of alternative current is:
Choose an answer
one of its Instantaneous value
Equal to its RMS value
The same as its peak-to-peak value
Both (B) and (C)
None of these
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Question # 14
When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
Choose an answer
9.4 kHz
940 kHz
94 kHz
None of these
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Question # 15
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 # 16
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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