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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
Choose an answer
Instantaneous value
RMS value
Value averaged over a cycle
Either (B) or (C)
Either (A) or (C)
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Question # 2
In a transistor, the central region is called
Choose an answer
collector
emitter
base
none of them
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Question # 3
At higher frequency of the alternating current, the capacitive reactance X
c
Choose an answer
Increases
Decreases
Remains the same
Increases only when the voltage increases
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Question # 4
The sum of positive and negative peak values is called:
Choose an answer
Instantaneous value
Peak value
Rms valuie
Peak-to peak-value
None of these
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Question # 5
If we connect a A.C. volt meter to read A.C. voltage, It would read its:
Choose an answer
RMS value
Instantaneous value
Valued average over a cycle
Zero
Both (B) and (C)
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Question # 6
The value of the input resistance of OP-AMP is of the order of
Choose an answer
few ohms
few hundred ohms
several kilo ohms
several maga ohms
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Question # 7
Transmitting antenna emits
Choose an answer
Magnetic waves
Electric waves
Electromagnetic waves
Sound waves
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Question # 8
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 # 9
The power factor of resonant series circuit is
Choose an answer
1
0
-1
0.5
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Question # 10
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 # 11
When the emitter-base junction of a transistor is reverse biased, collector current
Choose an answer
Reverses
Increases
Decreases
Stops
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Question # 12
At resonance, the impedance of RLC series circuit is
Choose an answer
Maximum
Zero
Minimum
Determinate
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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
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 # 15
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 # 16
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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