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Online Tests
Physics FSC Part 2 Chapter 16 Online MCQ's Test MCQs With Answers
Question # 1
In purely resistive A.C circuit, instantaneous value of voltage and current:
Choose an answer
Current lags behind voltage
Current leads voltage by π/2
Both are in Phase
Voltage leads current by Pase θ=π/2
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Question # 2
The value of capacitive reactance is given by
Choose an answer
Xc = VI
All of above
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Question # 3
The peak value of alternating current is 5
√2
A. The mean square value of current will be:
Choose an answer
5A
2.5A
5
√2A
5
2
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Question # 4
The circuit in which current and voltage are in phase, the power factor is:
Choose an answer
Zero
1
-1
2
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Question # 5
Resistance of choke is
Choose an answer
zero
Large
Very small
Infinite
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Question # 6
The peak value of A.C source is 20 A, then its rms value will be.
Choose an answer
14.1 A
10 A
20 A
28.2 A
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Question # 7
The internal resistance of a capacitor is called:
Choose an answer
Impedance
Resistance
Reactance
Conductance
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Question # 8
If V
rms
be the root mean square value of emf then its peak to peak value is given by
Choose an answer
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Question # 9
The basic circuit element in A.C. circuit which controls current.
Choose an answer
Resistor only
Capacitor only
Inductor only
All of these
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Question # 10
In A.C circuit of inductor which one is true
Choose an answer
Voltage leads current by phase angle π/2
Voltage lags current by π/2
Current leads voltage by π/2
Both remain in phase
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Question # 11
In a pure inductive A.C. circuit the current.
Choose an answer
Lags behind voltage by 90
o
Leads the voltage by 90
o
In phase with voltage
Leads the voltage by 270
o
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Question # 12
The phase angle of a series RLC circult at resonant frequency is
Choose an answer
1/2
sigma
Zero
sigma /4
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Question # 13
The phase difference between the current and voltage at resonce is:
Choose an answer
0
π
-
π
π/2
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Question # 14
For electromagnetic waves, Maxwell generalized
Choose an answer
Gauses law for magnetism
Gauses law for eletricity
Fradays law
Amperes law
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Question # 15
A resistance frequency the impedance of RLC parallel circuit is.
Choose an answer
Zero
Infinite
Maximum
Minimum
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Question # 16
The power factor of RL series circuit is.
Choose an answer
0
1
Less then 1
More than one
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Question # 17
In chopke coil the resistance X
L
an resistance R are:
Choose an answer
X
L
=R
X
L
<<R
X
L
>>R
X
L
=
∞
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Question # 18
Average value of current and voltage over a complete cycle is.
Choose an answer
Positive
Negative
Zero
Infinite
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