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Online Tests
Ics Part 2 Physics Chapter 5 Test Online MCQs With Answers
Question # 1
Average value of current and voltage over a complete cycle is.
Choose an answer
Positive
Negative
Zero
Infinite
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Question # 2
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 # 3
If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.
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Half
Two
Four times
One fourth
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Question # 4
Main reason for world wide use of A.C. is
Choose an answer
It is cheaper
Transmitted
Botha a and b
Reaches in short time
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Question # 5
In three phase A.C. generator the phase difference between each pair of coil is.
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45
o
90
o
120
o
60
o
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Question # 6
In metal detector, we use.
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L-C circuit
R-L circuit
R-C circuit
RLC series circuit
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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 velocity of an oscillating charge as it moves to and fro along a wire is.
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Changing
Constant
Infinite
zero
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Question # 9
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 # 10
The peak value of alternating current is 5
√2
A. The mean square value of current will be:
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5A
2.5A
5
√2A
5
2
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Question # 11
The value of capacitive reactance is given by
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Xc = VI
All of above
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Question # 12
The circuit which compares the two voltages is.
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LDR
Sensor
Comparator
Logic gate
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Question # 13
At high frequency, the current through a capacitor is
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Small
Infinity
Zero
Large
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Question # 14
In a pure inductive A.C. circuit the current.
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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 # 15
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 # 16
The unit of impedance is.
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Henry
Hertz
Ampere
Ohm
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Question # 17
The peak to peak value of alternating voltage is
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2V
o
V
o
None of these
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Question # 18
The wave form of alternating voltage is a
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Cotangent curve
Cosine curve
Sine curve
Tangent curve
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