More Classes
5th Class
6th Class
7th Class
8th Class
9th Class
10th Class
11th Class
12th Class
NAT I
NAT II
CSS
IQ
General Knowledge
MDCAT
ECAT
GAT General
GAT Subject
Other Links
Go to Home
Online Tests
ECAT Pre General Science Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
For the normal operation of the transistor, its
Choose an answer
emitter-base and collector base junctions are forward biased
emitter-base junction is reversed biased and collector base junction is forward biased
emitter-base junction is forward biased and collector-base junction is reverse biased
any one of these
Previous
Skip
Next
Question # 2
The magnitude of alternative voltage V:
Choose an answer
Always increase
Always decrease
Remains constant
Does not remain constant
None of these
Previous
Skip
Next
Question # 3
When either L or C is increased, the resonant frequency of the RLC series circuit
Choose an answer
Increases
Decreases
Remains the same
Becomes zero
Previous
Skip
Next
Question # 4
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
Previous
Skip
Next
Question # 5
The closed loop gain of the inverting amplifier is written as
Choose an answer
G = R
2
/R
1
G = 1 + R
2
/R
1
G = -R
2
/R
1
G = 1 - R
2
/R
1
Previous
Skip
Next
Question # 6
A P-N juction or semiconductor diode cannot be used as
Choose an answer
A rectifier
Detector
Oscillator
An amplifier
Previous
Skip
Next
Question # 7
At higher frequency of the alternating current, the capacitive reactance X
c
Choose an answer
Increases
Decreases
Remains the same
Increases only when the voltage increases
Previous
Skip
Next
Question # 8
The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
Choose an answer
I
c
will decrease
V
CE
will increase
I
C
will increase
V
CC
will increase
Previous
Skip
Next
Question # 9
In n-p-n transistor, emitter base junction is kept
Choose an answer
reversed
forward biased
may be reversed or may be forward biased
none of these
Previous
Skip
Next
Question # 10
In half wave rectification
Choose an answer
both halves of the input voltage is used
only one half of the input voltage is used
either of these
none of these
Previous
Skip
Next
Question # 11
When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
Choose an answer
9.4 kHz
940 kHz
94 kHz
None of these
Previous
Skip
Next
Question # 12
The waveform of alternating voltage is a:
Choose an answer
Square
Rectangular
Saw-tooth
Sinusoidal
None of these
Previous
Skip
Next
Question # 13
During each cycle, alternating voltage reaches a peak value
Choose an answer
One time
Two times
Four times
A number of times depending on the frequency
Previous
Skip
Next
Question # 14
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
Previous
Skip
Next
Question # 15
Which of the following has a great concentration of impurity
Choose an answer
base
emitter
collector
none of these
Previous
Skip
Next
Question # 16
The output voltage of half wave rectification is in the form of
Choose an answer
a smooth curve
a smooth wave
pulses
all of the above
Previous
Skip
Next
Question # 17
The sum of positive and negative peak values is called:
Choose an answer
Instantaneous value
Peak value
Rms valuie
Peak-to peak-value
None of these
Previous
Skip
Next
Question # 18
The circuit which is used to smooth the output voltage of the full-wave rectification is known as
Choose an answer
transformer
rectifier
filter
none of these
Previous
Skip
Next
Question # 19
The average of A.C. current and voltage over a complete cycle is
Choose an answer
Maximum
zero
Neither zero nor maximum
None of these
Previous
Skip
Next
Question # 20
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
Previous
Skip
Next
Back