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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
When the emitter-base junction of a transistor is reverse biased, collector current
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Reverses
Increases
Decreases
Stops
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Question # 2
When either L or C is increased, the resonant frequency of the RLC series circuit
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Increases
Decreases
Remains the same
Becomes zero
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Question # 3
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 # 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
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 # 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
A diode characteristic curve is a plot between
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current and time
voltage and time
voltage and current
forward voltage and reversed voltage
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Question # 8
When the pn-junction is in reversed biased, current flows through the junction due to the
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majority carriers
minority carriers
either of them
none of them
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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
During the negative half-cycle of the half-wave rectification, the diode
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does not conduct
conducts
either of these
none of these
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Question # 11
Which one of the following waves belongs to electromagnetic spectrum
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Radio and TV waves
Radar waves
Micro waves
All of them
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Question # 12
When the p-n junction is forward biased its resistance is of the order of
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few mega ohms
few kilo ohms
few ohms
few milli ohms
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Question # 13
A signal appears after amplification, at the output terminal with a phase shift of 180
° , if it is applied at
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inverting input
non-inverting input
any one of the input terminal
none of them
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Question # 14
In a transistor, the central region is called
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collector
emitter
base
none of them
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Question # 15
A changing magnetic flux creates around itself
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An electromotive force
An electric field (changing electric flux)
Magnetic field
None of the above
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Question # 16
The phase at the positive peak of an A.C. cycle is:
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0
º
90
º
180
º
0 and
Ꮨ
Ꮨ/2 and 3
Ꮨ/2
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