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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
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 # 2
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 # 3
The value of the potential difference across the depletion region for the case of germanium is
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0.3 V
0.5 V
0.7 V
0.9 V
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Question # 4
Transmitting antenna emits
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Magnetic waves
Electric waves
Electromagnetic waves
Sound waves
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Question # 5
At resonance frequency the impedance of parallel resonance circuit is
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Maximum
Minimum
Zero
None of the above
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Question # 6
The time interval during which the Voltage source changes its polarity once is known as:
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Time period T
Half the time period
Quarter the time period
Two third of the time period
None of these
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Question # 7
Which one of the following is correct?
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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 free space, the speed of electromagnetic waves is
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3 x 10
8
ms
-1
3 x 10
6
ms
-1
4 x 10
7
ms
-1
3 x 10
9
ms
-1
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Question # 9
Which of the following has a great concentration of impurity
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base
emitter
collector
none of these
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Question # 10
When the pn-junction is forward biased. the current flows through it is of the order of
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mili-amperes
amperes
nano-amperes
micro-amperes
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Question # 11
A resonance curve for RLC series circuit is a plot of frequency versus
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Voltage
Current
Impedance
Reactance
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Question # 12
The value of the input resistance of OP-AMP is of the order of
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few ohms
few hundred ohms
several kilo ohms
several maga ohms
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Question # 13
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 # 14
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 # 15
In RLC series circuit, resonance occurs when
Choose an answer
X
L > Xc
X
L < Xc
X
L = Xc
None of these
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Question # 16
The device which allows only the flow of an A.C. through a circuit is
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Capacitor
Inductor
D.C. motor
Battery
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Question # 17
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 # 18
Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
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X-rays
Ultraviolet rays
y-rays
Cosmic rays
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Question # 19
Average value of A.C voltage during one cycle is
Choose an answer
1
Zero
Maximum
Variable
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Question # 20
The total reactance of a series RLC circuit at resonance is
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zero
Equal to the resistance
Infinity
Capacitive
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