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Online Tests
Physics Fsc Part 2 Chapter 5 Online Test MCQs With Answers
Question # 1
In three phase voltage across any two lines is about.
Choose an answer
220 V
230 V
400 V
430 V
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Question # 2
The device which allows only the continuous flow of AC through it is.
Choose an answer
Inductor
Battery
Thermistor
Capacitor
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Question # 3
The effective value of any sinusoidal alternating current or voltage is
Choose an answer
None of the above
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Question # 4
100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.
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30.8 Ohm
31.8 Ohm
34.8 Ohm
40 Ohm
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Question # 5
Vrms =
Choose an answer
0.7V
∘
0.07V
∘
0.007V
∘
0.75V
∘
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Question # 6
During each cycle A.C. voltage reaches a peak value.
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Once
Twice
Thrice
Four time
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Question # 7
Power dissipation in A.C circuit is expressed as:
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P =I
rms
x V
rms
Sinθ
IxVCosθ
I
rms
xV
rms
Cosθ
I
rms
x V
rms
Sin2θ
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Question # 8
X
1
is low for low frequency Fy but Xc is.
Choose an answer
Zero
Low
High
Same is H
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Question # 9
The velocity of an oscillating charge as it moves to and fro along a wire is.
Choose an answer
Changing
Constant
Infinite
zero
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Question # 10
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 # 11
An alternating quantity (voltage or current) is completely known if we know its:
Choose an answer
Maximum
Frequency and phase
Effective value
Both (a) & (b)
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Question # 12
At high frequency the value of reactance of capacitor will be.
Choose an answer
Small
Zero
Large
Infinite
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Question # 13
The combined effect of resistance and reactance in circuit is called:
Choose an answer
Impedance
Inductance
Capacitance
None of above
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Question # 14
SI unit of reactance is.
Choose an answer
Ohm
Mho
Farad
Henry
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Question # 15
The most common source of an A.C. Voltage is.
Choose an answer
Motor
Cell
Generator
Thermo couple
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Question # 16
The main reason for world wide use of A.C is because:
Choose an answer
It is very high power
It can be transmitted over long distance
It is cheaper to use
ALl of above
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Question # 17
Radio frequency choke is
Choose an answer
Iron cored
Air Cored
Air as well as iron cored
None of these
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Question # 18
The power factor of RL series circuit is.
Choose an answer
0
1
Less then 1
More than one
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