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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
Choose an answer
X-rays
Ultraviolet rays
y-rays
Cosmic rays
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Question # 2
Mathematical manipulation of the two quantized states can be best carried if they are represented by
Choose an answer
high - low
yes - no
on - off
0 - 1
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Question # 3
Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
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photo diode
light emitting diode
photo voltaic cell
none of these
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Question # 4
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 # 5
Transmitting antenna emits
Choose an answer
Magnetic waves
Electric waves
Electromagnetic waves
Sound waves
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Question # 6
The r.m.s. value of alternating current is equal to its maximum value at angle of
Choose an answer
60
°
45
°
30
°
90
°
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Question # 7
In describing functions of digital systems, a closed switch will be shown as
Choose an answer
0
1
low
any one of these
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Question # 8
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 # 9
A signal is amplified at the output without any change of phase, if it is applied at the
Choose an answer
inverting input
non-inverting input
at any of the input
none of these
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Question # 10
The output voltage of half wave rectification is in the form of
Choose an answer
a smooth curve
a smooth wave
pulses
all of the above
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Question # 11
A resonance curve for RLC series circuit is a plot of frequency versus
Choose an answer
Voltage
Current
Impedance
Reactance
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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
At resonance frequency the impedance of parallel resonance circuit is
Choose an answer
Maximum
Minimum
Zero
None of the above
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Question # 14
Conversion of alternating current into direct current is called
Choose an answer
amplification
rectification
conduction
polarization
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Question # 15
The basic circuit element in A.C. circuits are:
Choose an answer
Resistor and capacitor
Resistor and Inductor
Capacitor only
Both (B) and (C)
None of these
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Question # 16
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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