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Online Tests
Physics Fsc Part 2 Chapter 5 Online Test MCQs With Answers
Question # 1
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 # 2
The expression P = VI hold only when current and voltage are.
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In phase
Out of phase
At right angle to each other
At angle of 120
o
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Question # 3
In RLC circuit the energy is dissipated in
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R only
R and L
R and C
L and C
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Question # 4
At high frequency the value of reactance of capacitor will be.
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Small
Zero
Large
Infinite
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Question # 5
In A.C circuit of inductor which one is true
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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 # 6
A resistance frequency the impedance of RLC parallel circuit is.
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Zero
Infinite
Maximum
Minimum
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Question # 7
The phase difference between current and voltage in an inductive circuit is.
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zero
90
o
180
o
45
o
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Question # 8
The A.M. transmission frequencies range from
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540 KHz to 1000 KHz
540 Khz to 1600 KHz
520 KHz TO 1600 KHz
520 KHz TO 1400 KHz
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Question # 9
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 # 10
The mean value of A.C. in a cycle is.
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1
0
I2
Nil
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Question # 11
The resonance frequency is given by:
Choose an answer
fr = 2π√LC
fr = 1/2πLC
fr = 1/ 2π√LC
f1 = 1/ 2πC√L
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Question # 12
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 # 13
In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?
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4 times
1/4 times
8 times
2 times
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Question # 14
At resonance, the behavior of R-L-C series circuit is.
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Resistive
Capacitive
Inductive
Modulative
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Question # 15
The peak to peak value of alternating voltage is
Choose an answer
2V
o
V
o
None of these
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Question # 16
The combined effect of resistance and reactance is knows as.
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Inductance
Conductance
Resistance
Impedance
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Question # 17
Vrms =
Choose an answer
0.7V
∘
0.07V
∘
0.007V
∘
0.75V
∘
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Question # 18
In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is.
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Maximum
Minimum
Zero
Negative
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