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ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
Alternating current can be transmitted:
Choose an answer
To long distance
At very high cost
At very low cost
Both (A) and (C)
Both (A) and (B)
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Question # 2
Nowadays, Most of the electric energy is produced by the A.C. generators using:
Choose an answer
Hydal water
Geothermal energy
Solar energy
Biomass
Both (B) and (D)
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Question # 3
For a n-p-n transistor, the conventional current equation can be written as
Choose an answer
I
E
+ I
C
= I
B
I
C
- I
B
= I
E
I
C
+ I
B
= I
E
I
B
+ I
E
= I
C
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Question # 4
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 # 5
A diode characteristic curve is a plot between
Choose an answer
current and time
voltage and time
voltage and current
forward voltage and reversed voltage
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Question # 6
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 # 7
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 # 8
Conversion of alternating current into direct current is called
Choose an answer
amplification
rectification
conduction
polarization
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Question # 9
The phase angle of a series RLC circuit at resonance is
Choose an answer
180
°
90
°
0
°
None of the these
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Question # 10
The Instantaneous value of alternative current maybe:
Choose an answer
The same as its RMS value
Greater than its Rms value
The same as its peak value
Any of these
None of these
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Question # 11
When the pn-junction is forward biased. the current flows through it is of the order of
Choose an answer
mili-amperes
amperes
nano-amperes
micro-amperes
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Question # 12
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 # 13
Transmitting antenna emits
Choose an answer
Magnetic waves
Electric waves
Electromagnetic waves
Sound waves
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Question # 14
A P-N juction or semiconductor diode cannot be used as
Choose an answer
A rectifier
Detector
Oscillator
An amplifier
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Question # 15
During the positive half-cycle in the half-wave rectification,the diode
Choose an answer
does not conduct
conducts
either of these
neither of these
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Question # 16
Which one of the following waves belongs to electromagnetic spectrum
Choose an answer
Radio and TV waves
Radar waves
Micro waves
All of them
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