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Online Tests
ECAT Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
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 # 2
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 # 3
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 # 4
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 # 5
The magnitude of alternative voltage V:
Choose an answer
Always increase
Always decrease
Remains constant
Does not remain constant
None of these
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Question # 6
The device which allows only the flow of an A.C. through a circuit is
Choose an answer
Capacitor
Inductor
D.C. motor
Battery
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Question # 7
In series RC circuit when R=X
c
, then the phase angle is
Choose an answer
0
°
90
°
70
°
45
°
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Question # 8
Most OP-AMP operates with
Choose an answer
+
6 V supply
+
10 V supply
+
12 V supply
+
24 V supply
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Question # 9
Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
Choose an answer
Peak value
RMS value
Instantaneous value
Peak-to-peak value
Both (A) and (C0
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Question # 10
The value of the potential difference across the depletion region for the case of germanium is
Choose an answer
0.3 V
0.5 V
0.7 V
0.9 V
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Question # 11
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 # 12
In a transistor, the central region is called
Choose an answer
collector
emitter
base
none of them
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Question # 13
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 # 14
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 # 15
An A.C varies as a function of
Choose an answer
Current
Voltage
Time
Charge
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Question # 16
The phase at the positive peak of an A.C. cycle is:
Choose an answer
0
º
90
º
180
º
0 and
Ꮨ
Ꮨ/2 and 3
Ꮨ/2
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