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Online Tests
Physics Fsc Part 2 Chapter 5 Online Test MCQs With Answers
Question # 1
In modulation, low frequency signal is known as
Choose an answer
Carrier wave
fluctuated signal
Modulated carrier signal
Modulation signal
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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
At resonance, the behavior of R-L-C series circuit is.
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Resistive
Capacitive
Inductive
Modulative
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Question # 4
An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:
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50 Hz
25Hz
100 Hz
75 Hz
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Question # 5
X
1
is low for low frequency Fy but Xc is.
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Zero
Low
High
Same is H
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Question # 6
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 # 7
when an inductor comes close to a metallic object, its inductance is.
Choose an answer
Decreased
Increased
Becomes half
Becomes 4 times
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Question # 8
Vrms =
Choose an answer
0.7V
∘
0.07V
∘
0.007V
∘
0.75V
∘
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Question # 9
The flow of D.C current is opposed by
Choose an answer
Resistor
Induction
Capacitor
All of these
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Question # 10
The most common source of an A.C. Voltage is.
Choose an answer
Motor
Cell
Generator
Thermo couple
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Question # 11
Electro magnetic waves emitted from radio antenna are.
Choose an answer
Stationary
Longitudinal
Transvers
Both a and b
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Question # 12
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 # 13
The AC system is preferred to DC system because:
Choose an answer
AC voltage can be easily changed in magnitude
DC motor angular velocity is affected badly
High voltage AC transmission is less efficient
Domestic appliance require AC voltage for their operation
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Question # 14
The combined effect of resistance and reactance is knows as.
Choose an answer
Inductance
Conductance
Resistance
Impedance
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Question # 15
In three phase A.C supply coils are inclined at an angle of.
Choose an answer
0
o
90
o
120
o
80
o
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Question # 16
The Basic circuit element in a D.C. circuits which controls the current and voltage is
Choose an answer
Resistor
Inductor
Capisitor
Transistor
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Question # 17
An in cudutor may store energy in
Choose an answer
Its magnetic field
Its coil
Its electric field
A neighboring circuit
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