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ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
Alternating current is produced by a voltage source which polarity:
Choose an answer
Remains the same
Reverse after period T
Keeps on reversing with time
Reverse after every time interval T/2
Both (C) and (D)
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Question # 2
The impedance of RLC series resonance circuit at resonant frequency is
Choose an answer
Greater than R
Equal to R
Less than R
None of these
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Question # 3
Average value of A.C voltage during one cycle is
Choose an answer
1
Zero
Maximum
Variable
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Question # 4
The power factor of resonant series circuit is
Choose an answer
1
0
-1
0.5
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Question # 5
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 # 6
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 # 7
Which one of the following is correct?
Choose an answer
V
o
= 1.414 V
rms
I
ams
= 1.414 I
o
VO = 10.70 Vrms
Both a and b
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Question # 8
In which of the following components, pn-junction is used
Choose an answer
light emitting diode
photo diode
photo voltaic cell
all of these
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Question # 9
The RMS value of alternating current is:
Choose an answer
0.7 times at the peak value
0.5 times the peak value
0.7 times the Instantaneous value
Equal to maximum voltage
None of these
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Question # 10
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 # 11
The average of A.C. current and voltage over a complete cycle is
Choose an answer
Maximum
zero
Neither zero nor maximum
None of these
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Question # 12
An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
Choose an answer
3525.0 volts
35.35 volts
353.5 volts
3.535 volts
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Question # 13
The bridge circuit of full wave rectification uses
Choose an answer
one diode
two diode
three diode
four diode
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Question # 14
A signal appears after amplification, at the output terminal with a phase shift of 180
° , if it is applied at
Choose an answer
inverting input
non-inverting input
any one of the input terminal
none of them
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Question # 15
In a transistor, the central region is called
Choose an answer
collector
emitter
base
none of them
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Question # 16
The entire wave form of sinusoidal voltage is actually a set of all the:
Choose an answer
Positive maximum value + V
o
and negative maximum value -V
o
Posiotive maximum value +V
o
and zero
Zero and negative maximum value -V
o
Any of these
None of these
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