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Ics Part 2 Physics Chapter 5 Test Online 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 resonance frequency is given by:
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fr = 2π√LC
fr = 1/2πLC
fr = 1/ 2π√LC
f1 = 1/ 2πC√L
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Question # 3
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 # 4
In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.
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90
o
270
o
0
o
180
o
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Question # 5
At resonance frequency, the impedance of RLC series circuit is.
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Maximum
Minimum
Zero
Infinite
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Question # 6
Unit of impedance is:
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Ohm
Ohm
-1
no unit
Ohm m
-1
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Question # 7
The main reason for world wide use of A.C is because:
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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 # 8
The Basic circuit element in a D.C. circuits which controls the current and voltage is
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Resistor
Inductor
Capisitor
Transistor
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Question # 9
The unit of impedance is
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Farad
Henry
Tesla
Ohm
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Question # 10
The highest value reached by the voltage or current is one cycle is called:
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Peak to peak value
Peak value
Instantaneous value
Root mean square value
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Question # 11
In three phase voltage across any two lines is about.
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220 V
230 V
400 V
430 V
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Question # 12
At high frequency the value of reactance of capacitor will be.
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Small
Zero
Large
Infinite
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Question # 13
The internal resistance of a capacitor is called:
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Impedance
Resistance
Reactance
Conductance
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Question # 14
The mean value of A.C. in a cycle is.
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1
0
I2
Nil
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Question # 15
In Pakistan the frequency of A.C. supply is.
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50 Hz
60 Hz
45 Hz
70 Hz
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Question # 16
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 # 17
The peak value of A.C source is 20 A, then its rms value will be.
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14.1 A
10 A
20 A
28.2 A
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Question # 18
The device which allows only the continuous flow of AC through it is.
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Inductor
Battery
Thermistor
Capacitor
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