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Online Tests
ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
Which of the following diode is used for the detection of light
Choose an answer
photo diode
light emitting diode
photo voltaic cell
all of them
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Question # 2
In RLC series circuit, resonance occurs when
Choose an answer
X
L > Xc
X
L < Xc
X
L = Xc
None of these
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Question # 3
Most OP-AMP operates with
Choose an answer
+
6 V supply
+
10 V supply
+
12 V supply
+
24 V supply
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Question # 4
In a normally biased n-p-n transistor, an electron c current I
E
flows from the
Choose an answer
emitter into the base
collector into the base
base into collector
none of these
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Question # 5
At resonance, the impedance of RLC series circuit is
Choose an answer
Maximum
Zero
Minimum
Determinate
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Question # 6
The bridge circuit of full wave rectification uses
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one diode
two diode
three diode
four diode
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Question # 7
For a n-p-n transistor, the conventional current equation can be written as
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I
E
+ I
C
= I
B
I
C
- I
B
= I
E
I
C
+ I
B
= I
E
I
B
+ I
E
= I
C
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Question # 8
To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
Choose an answer
5.07 pF
50 pF
0.507 pF
507 pF
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Question # 9
A changing magnetic flux creates around itself
Choose an answer
An electromotive force
An electric field (changing electric flux)
Magnetic field
None of the above
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Question # 10
The basic circuit element in A.C. circuits are:
Choose an answer
Resistor and capacitor
Resistor and Inductor
Capacitor only
Both (B) and (C)
None of these
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Question # 11
In a transistor, if the central region is n-type, then this type of transistor is known as
Choose an answer
n-p-n transistor
p-n-p transistor
either of these
none of these
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Question # 12
A signal is amplified at the output without any change of phase, if it is applied at the
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inverting input
non-inverting input
at any of the input
none of these
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Question # 13
The value of current gain of n-p-n transistor is of the order of
Choose an answer
tens
hundreds
thousands
ten thousands
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Question # 14
A digital system deals with quantities or variables which have
Choose an answer
only one state
only two discrete states
three discrete states
four discrete states
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Question # 15
The input resistance of the OP-AMP is the resistance between the
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(-) input and output
(+) input and output
(-) and (+) inputs
between any inputs
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Question # 16
In free space, the speed of electromagnetic waves is
Choose an answer
3 x 10
8
ms
-1
3 x 10
6
ms
-1
4 x 10
7
ms
-1
3 x 10
9
ms
-1
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Question # 17
In describing functions of digital systems, a closed switch will be shown as
Choose an answer
0
1
low
any one of these
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Question # 18
During the negative half-cycle of the half-wave rectification, the diode
Choose an answer
does not conduct
conducts
either of these
none of these
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Question # 19
When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the
Choose an answer
base and emitter
collector and emitter
base and collector
any one of these
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Question # 20
The open loop gain of OP-AMP is of the order of
Choose an answer
10
2
10
3
10
4
10
5
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