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

Question # 1

The basic circuit element in A.C. circuits are:

Resistor and capacitor A
Resistor and Inductor B
Capacitor only C
Both (B) and (C) D
None of these E

Question # 2

The entire wave form of sinusoidal voltage is actually a set of all the:

Positive maximum value + V_oand negative maximum value -V_o A
Posiotive maximum value +V_oand zero B
Zero and negative maximum value -V_o C
Any of these D
None of these E

Question # 3

The total reactance of a series RLC circuit at resonance is

zero A
Equal to the resistance B
Infinity C
Capacitive D

Question # 4

For the normal operation of the transistor, its

emitter-base and collector base junctions are forward biased A
emitter-base junction is reversed biased and collector base junction is forward biased B
emitter-base junction is forward biased and collector-base junction is reverse biased C
any one of these D

Question # 5

For a n-p-n transistor, the conventional current equation can be written as

I_E+ I_C= I_B A
I_C- I_B= I_E B
I_C+ I_B= I_E C
I_B+ I_E= I_C D

Question # 6

Average value of A.C voltage during one cycle is

1 A
Zero B
Maximum C
Variable D

Question # 7

In half wave rectification

both halves of the input voltage is used A
only one half of the input voltage is used B
either of these C
none of these D

Question # 8

An A.C varies as a function of

Current A
Voltage B
Time C
Charge D

Question # 9

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 # 10

The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

zero A
infinity B
one C
any one of these D

Question # 11

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 # 12

In frequency modulation (FM), the carrier waves amplitude

Remains constant A
Increase B
Decreases C
None of these D

Question # 13

The device which allows only the flow of an A.C. through a circuit is

Capacitor A
Inductor B
D.C. motor C
Battery D

Question # 14

Chock consumes externally small

Charge A
Current B
Power C
Potential D

Question # 15

The magnitude of alternative voltage V:

Always increase A
Always decrease B
Remains constant C
Does not remain constant D
None of these E

Question # 16

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

0° A
90° B
70° C
45° D

Question # 17

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

inverting input A
non-inverting input B
any one of the input terminal C
none of them D

Question # 18

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 # 19

The closed loop gain of the non-inverting amplifier is given by

G = R₂/R₁ A
G = -R₂/R₁ B
G = 1 - R₂/R₁ C
G = 1 + T₂/R₁ D

Question # 20

The basic circuit elements of A.C circuit are

Resistor A
Inductor B
Capacitor C
All the three D

Question # 21

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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

Question # 22

Which one of the following is correct?

V_o= 1.414 V_rms A
I_ams= 1.414 I_o B
VO = 10.70 Vrms C
Both a and b D

Question # 23

In a transistor, the central region is called

collector A
emitter B
base C
none of them D

Question # 24

In describing functions of digital systems, a closed switch will be shown as

0 A
1 B
low C
any one of these D

Question # 25

The value of the potential difference across the depletion region for the case of germanium is

0.3 V A
0.5 V B
0.7 V C
0.9 V D

Question # 26

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 # 27

A digital system deals with quantities or variables which have

only one state A
only two discrete states B
three discrete states C
four discrete states D

Question # 28

The length of rotating vector (on a certain scale) represents the:

Peak value of alternating quantity A
RMS value of alternating quantity B
Instantaneous value of alternating quantity C
Either (B) or (C) D
Either (A) or (B) E

Question # 29

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

transformer A
rectifier B
filter C
none of these D

Question # 30

Most OP-AMP operates with

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

Sr.#	Question	Answer
1	In free space, the speed of electromagnetic waves is	A. 3 x 10⁸ms^-1 B. 3 x 10⁶ms^-1 C. 4 x 10⁷ms^-1 D. 3 x 10⁹ms^-1
2	The basic circuit elements of A.C circuit are	A. Resistor B. Inductor C. Capacitor D. All the three
3	The length of rotating vector (on a certain scale) represents the:	A. Peak value of alternating quantity B. RMS value of alternating quantity C. Instantaneous value of alternating quantity D. Either (B) or (C)
4	A sinusoidally alternating voltage or current can be graphically represented by a:	A. Vector B. Rotating vector C. Clockwise vector D. Anticlockwise voltage vector
5	Which one of the following waves belongs to electromagnetic spectrum	A. Radio and TV waves B. Radar waves C. Micro waves D. All of them
6	Most OP-AMP operates with	A. + 6 V supply B. + 10 V supply C. + 12 V supply D. + 24 V supply
7	If we connect a A.C. volt meter to read A.C. voltage, It would read its:	A. RMS value B. Instantaneous value C. Valued average over a cycle D. Zero
8	In n-p-n transistor, emitter base junction is kept	A. reversed B. forward biased C. may be reversed or may be forward biased D. none of these
9	In frequency modulation (FM), the carrier waves amplitude	A. Remains constant B. Increase C. Decreases D. None of these
10	In a normally biased n-p-n transistor, an electron c current I_Eflows from the	A. emitter into the base B. collector into the base C. base into collector D. none of these

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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 basic circuit element in A.C. circuits are:

The entire wave form of sinusoidal voltage is actually a set of all the:

The total reactance of a series RLC circuit at resonance is

For the normal operation of the transistor, its

For a n-p-n transistor, the conventional current equation can be written as

Average value of A.C voltage during one cycle is

In half wave rectification

An A.C varies as a function of

Alternating current is produced by a voltage source which polarity:

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

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

In frequency modulation (FM), the carrier waves amplitude

The device which allows only the flow of an A.C. through a circuit is

Chock consumes externally small

The magnitude of alternative voltage V:

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

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

The wave form of alternating voltage is the graph between:

The closed loop gain of the non-inverting amplifier is given by

The basic circuit elements of A.C circuit are

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Which one of the following is correct?

In a transistor, the central region is called

In describing functions of digital systems, a closed switch will be shown as

The value of the potential difference across the depletion region for the case of germanium is

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

A digital system deals with quantities or variables which have

The length of rotating vector (on a certain scale) represents the:

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Most OP-AMP operates with

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The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

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