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 Physics Chapter 16 Alternating Current Online Test MCQs With Answers
Question # 1
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
Previous
Skip
Next
Question # 2
In a transistor, if the central region is p-type then this type of transistor is known as
Choose an answer
p-n-p transistor
n-p-n transistor
either of these
none of these
Previous
Skip
Next
Question # 3
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 # 4
A diode characteristic curve is a plot between
Choose an answer
current and time
voltage and time
voltage and current
forward voltage and reversed voltage
Previous
Skip
Next
Question # 5
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 # 6
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 # 7
Chock consumes externally small
Choose an answer
Charge
Current
Power
Potential
Previous
Skip
Next
Question # 8
Alternating current can induce voltage because it has a
Choose an answer
High peak value
Varying magnetic field
Stronger field than direct curren
Constant magnetic field
Previous
Skip
Next
Question # 9
In RLC series circuit, resonance occurs when
Choose an answer
X
L > Xc
X
L < Xc
X
L = Xc
None of these
Previous
Skip
Next
Question # 10
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 # 11
Mathematical manipulation of the two quantized states can be best carried if they are represented by
Choose an answer
high - low
yes - no
on - off
0 - 1
Previous
Skip
Next
Question # 12
The device which allows only the flow of an A.C. through a circuit is
Choose an answer
Capacitor
Inductor
D.C. motor
Battery
Previous
Skip
Next
Question # 13
The highest value reached by the voltage or current:
Choose an answer
In quarter cycle is called Instantaneous value
In half cycle is called peak-to-peak value
In one cycle is called peak value
In half cycle is called Instantaneous value
None of these
Previous
Skip
Next
Question # 14
An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
Choose an answer
3525.0 volts
35.35 volts
353.5 volts
3.535 volts
Previous
Skip
Next
Question # 15
If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
Choose an answer
Instantaneous value
RMS value
Value averaged over a cycle
Either (B) or (C)
Either (A) or (C)
Previous
Skip
Next
Question # 16
An A.C varies as a function of
Choose an answer
Current
Voltage
Time
Charge
Previous
Skip
Next
Question # 17
When the p-n junction is forward biased its resistance is of the order of
Choose an answer
few mega ohms
few kilo ohms
few ohms
few milli ohms
Previous
Skip
Next
Question # 18
Transmitting antenna emits
Choose an answer
Magnetic waves
Electric waves
Electromagnetic waves
Sound waves
Previous
Skip
Next
Question # 19
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 # 20
A signal is amplified at the output without any change of phase, if it is applied at the
Choose an answer
inverting input
non-inverting input
at any of the input
none of these
Previous
Skip
Next
Back