ECAT Pre General Science Chapter 16 online mcq test with answers for Physics chapter 16 (Alternating Current)

Question # 1

The sum of positive and negative peak values is called:

Instantaneous value A
Peak value B
Rms valuie C
Peak-to peak-value D
None of these E

Question # 2

Conversion of alternating current into direct current is called

amplification A
rectification B
conduction C
polarization D

Question # 3

Which of the following diodes can operate in the reverse biased condition

photo diode A
light emitting diode B
photo voltaic cell C
none of these D

Question # 4

The time interval during which the Voltage source changes its polarity once is known as:

Time period T A
Half the time period B
Quarter the time period C
Two third of the time period D
None of these E

Question # 5

The wave form of alternating voltage is the graph between:

Voltage across X-axis and time across y-axis A
Current and time B
Voltage along y-axis and time along x-axis C
Voltage and current D
Either (B) or (D) E

Question # 6

A sinusoidally alternating voltage or current can be graphically represented by a:

Vector A
Rotating vector B
Clockwise vector C
Anticlockwise voltage vector D
None of these E

Question # 7

The total reactance of a series RLC circuit at resonance is

zero A
Equal to the resistance B
Infinity C
Capacitive D

Question # 8

In series RC circuit when R=X_c, then the phase angle is

0° A
90° B
70° C
45° D

Question # 9

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

2nd group A
fourth group B
fifth group C
sixth group D

Question # 10

The value of the input resistance of OP-AMP is of the order of

few ohms A
few hundred ohms B
several kilo ohms C
several maga ohms D

Question # 11

A diode characteristic curve is a plot between

current and time A
voltage and time B
voltage and current C
forward voltage and reversed voltage D

Question # 12

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

RMS value A
Instantaneous value B
Valued average over a cycle C
Zero D
Both (B) and (C) E

Question # 13

The bridge circuit of full wave rectification uses

one diode A
two diode B
three diode C
four diode D

Question # 14

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

353.5V A
250V B
175V C
zero D
400V E

Question # 15

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

3525.0 volts A
35.35 volts B
353.5 volts C
3.535 volts D

Question # 16

In a transistor, if the central region is p-type then this type of transistor is known as

p-n-p transistor A
n-p-n transistor B
either of these C
none of these D

Question # 17

When the emitter-base junction of a transistor is reverse biased, collector current

Reverses A
Increases B
Decreases C
Stops D

Question # 18

OP-AMP has the following input terminals

one A
two B
three C
four D

Question # 19

Mathematical manipulation of the two quantized states can be best carried if they are represented by

high - low A
yes - no B
on - off C
0 - 1 D

Question # 20

The highest value reached by the voltage or current:

In quarter cycle is called Instantaneous value A
In half cycle is called peak-to-peak value B
In one cycle is called peak value C
In half cycle is called Instantaneous value D
None of these E

Question # 21

Which of the following diode is used for the detection of light

photo diode A
light emitting diode B
photo voltaic cell C
all of them D

Question # 22

The average of A.C. current and voltage over a complete cycle is

Maximum A
zero B
Neither zero nor maximum C
None of these D

Question # 23

The basic circuit elements of A.C circuit are

Resistor A
Inductor B
Capacitor C
All the three D

Question # 24

The power factor of resonant series circuit is

1 A
0 B
-1 C
0.5 D

Question # 25

A P-N juction or semiconductor diode cannot be used as

A rectifier A
Detector B
Oscillator C
An amplifier D

Question # 26

Alternating current is produced by a voltage source which polarity:

Remains the same A
Reverse after period T B
Keeps on reversing with time C
Reverse after every time interval T/2 D
Both (C) and (D) E

Question # 27

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

photo diode A
light emitting diode B
photo voltaic cell C
none of these D

Question # 28

The value of current gain of n-p-n transistor is of the order of

tens A
hundreds B
thousands C
ten thousands D

Question # 29

Most OP-AMP operates with

+ 6 V supply A
+ 10 V supply B
+ 12 V supply C
+ 24 V supply D

Question # 30

For normal operation of transistor, the batteries

V_CCis of much lower value than V_BB A
V_CCis of much higher value than V_BB B
V_{CC is equal to}V_BB C
none of these D

Sr.#	Question	Answer
1	Electromagnetic waves transmit energy equal to	A. 1/2 mv² B. m_oc² C. hf/c D. hf
2	The value of the input resistance of OP-AMP is of the order of	A. few ohms B. few hundred ohms C. several kilo ohms D. several maga ohms
3	A resonance curve for RLC series circuit is a plot of frequency versus	A. Voltage B. Current C. Impedance D. Reactance
4	In a transistor, if the central region is n-type, then this type of transistor is known as	A. n-p-n transistor B. p-n-p transistor C. either of these D. none of these
5	For the normal operation of the transistor, its	A. emitter-base and collector base junctions are forward biased B. emitter-base junction is reversed biased and collector base junction is forward biased C. emitter-base junction is forward biased and collector-base junction is reverse biased D. any one of these
6	The most common source of alternating voltage is:	A. Motor B. Transformer C. AC genrator D. Both (A) and (C)
7	When either L or C is increased, the resonant frequency of the RLC series circuit	A. Increases B. Decreases C. Remains the same D. Becomes zero
8	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	A. base and emitter B. collector and emitter C. base and collector D. any one of these
9	The basic circuit elements of A.C circuit are	A. Resistor B. Inductor C. Capacitor D. All the three
10	OP-AMP has the following input terminals	A. one B. two C. three D. four

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

ECAT Pre General Science Physics Chapter 16 Alternating Current

The sum of positive and negative peak values is called:

Conversion of alternating current into direct current is called

Which of the following diodes can operate in the reverse biased condition

The time interval during which the Voltage source changes its polarity once is known as:

The wave form of alternating voltage is the graph between:

A sinusoidally alternating voltage or current can be graphically represented by a:

The total reactance of a series RLC circuit at resonance is

In series RC circuit when R=Xc, then the phase angle is

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

The value of the input resistance of OP-AMP is of the order of

A diode characteristic curve is a plot between

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

The bridge circuit of full wave rectification uses

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

In a transistor, if the central region is p-type then this type of transistor is known as

When the emitter-base junction of a transistor is reverse biased, collector current

OP-AMP has the following input terminals

Mathematical manipulation of the two quantized states can be best carried if they are represented by

The highest value reached by the voltage or current:

Which of the following diode is used for the detection of light

The average of A.C. current and voltage over a complete cycle is

The basic circuit elements of A.C circuit are

The power factor of resonant series circuit is

A P-N juction or semiconductor diode cannot be used as

Alternating current is produced by a voltage source which polarity:

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

The value of current gain of n-p-n transistor is of the order of

Most OP-AMP operates with

For normal operation of transistor, the batteries

Prepare Complete Set Wise ECAT Pre General Science Physics Chapter 16 Alternating Current MCQs Online With Answers

Set 1

Set 2

Set 3

Set 4

Topic Test

Top Scorers Of ECAT Pre General Science Physics Chapter 16 Alternating Current MCQ`s Test

ECAT Physics Chapter 16 Important MCQ's

Test Questions

Is this page helpful?

Share your comments & questions here

In series RC circuit when R=X_c, then the phase angle is

If 250V is the RMS value of alternative voltage, then its peak value V_owill be: