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

Question # 1

Alternating current can induce voltage because it has a

High peak value A
Varying magnetic field B
Stronger field than direct curren C
Constant magnetic field D

Question # 2

The power factor of resonant series circuit is

1 A
0 B
-1 C
0.5 D

Question # 3

The waveform of alternating voltage is a:

Square A
Rectangular B
Saw-tooth C
Sinusoidal D
None of these E

Question # 4

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 # 5

A resonance curve for RLC series circuit is a plot of frequency versus

Voltage A
Current B
Impedance C
Reactance D

Question # 6

OP-AMP has the following input terminals

one A
two B
three C
four D

Question # 7

Transmitting antenna emits

Magnetic waves A
Electric waves B
Electromagnetic waves C
Sound waves D

Question # 8

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 # 9

The open loop gain of OP-AMP is of the order of

10² A
10³ B
10⁴ C
10⁵ D

Question # 10

The closed loop gain of the inverting amplifier is written as

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

Question # 11

A changing magnetic flux creates around itself

An electromotive force A
An electric field (changing electric flux) B
Magnetic field C
None of the above D

Question # 12

The impedance of RLC series resonance circuit at resonant frequency is

Greater than R A
Equal to R B
Less than R C
None of these D

Question # 13

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

X-rays A
Ultraviolet rays B
y-rays C
Cosmic rays D

Question # 14

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

I_cwill decrease A
V_CEwill increase B
I_Cwill increase C
V_CCwill increase D

Question # 15

When the pn-junction is connected reversed biased, its resistance is of the order of

few ohms A
few kilo-ohms B
few mega-ohms C
few mili-ohms D

Question # 16

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 # 17

During the negative half-cycle of the half-wave rectification, the diode

does not conduct A
conducts B
either of these C
none of these D

Question # 18

The most common source of alternating voltage is:

Motor A
Transformer B
AC genrator C
Both (A) and (C) D
Both (A) and (B) E

Question # 19

When the pn-junction is in reversed biased, current flows through the junction due to the

majority carriers A
minority carriers B
either of them C
none of them D

Question # 20

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 # 21

The bridge circuit of full wave rectification uses

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

Question # 22

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

0° A
90° B
70° C
45° D

Question # 23

The value of output resistance of OP-AMOP is of the order of

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

Question # 24

The Instantaneous value of alternative current maybe:

The same as its RMS value A
Greater than its Rms value B
The same as its peak value C
Any of these D
None of these E

Question # 25

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 # 26

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 # 27

When the pn-junction is forward biased. the current flows through it is of the order of

mili-amperes A
amperes B
nano-amperes C
micro-amperes D

Question # 28

Electromagnetic waves transmit energy equal to

1/2 mv² A
m_oc² B
hf/c C
hf D

Question # 29

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 # 30

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

Sr.#	Question	Answer
1	The phase angle of a series RLC circuit at resonance is	A. 180° B. 90° C. 0° D. None of the these
2	In a transistor, if the central region is p-type then this type of transistor is known as	A. p-n-p transistor B. n-p-n transistor C. either of these D. none of these
3	A resonance curve for RLC series circuit is a plot of frequency versus	A. Voltage B. Current C. Impedance D. Reactance
4	Which of the following has a great concentration of impurity	A. base B. emitter C. collector D. none of these
5	OP-AMP has the following input terminals	A. one B. two C. three D. four
6	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
7	The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its	A. I_cwill decrease B. V_CEwill increase C. I_Cwill increase D. V_CCwill increase
8	The entire wave form of sinusoidal voltage is actually a set of all the:	A. Positive maximum value + V_oand negative maximum value -V_o B. Posiotive maximum value +V_oand zero C. Zero and negative maximum value -V_o D. Any of these
9	In describing functions of digital systems, a closed switch will be shown as	A. 0 B. 1 C. low D. any one of these
10	In an A.C circuit with resistor only, the current and voltage have a phase angle of	A. 90° B. 0° C. 180° 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

Alternating current can induce voltage because it has a

The power factor of resonant series circuit is

The waveform of alternating voltage is a:

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

A resonance curve for RLC series circuit is a plot of frequency versus

OP-AMP has the following input terminals

Transmitting antenna emits

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

The open loop gain of OP-AMP is of the order of

The closed loop gain of the inverting amplifier is written as

A changing magnetic flux creates around itself

The impedance of RLC series resonance circuit at resonant frequency is

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

When the pn-junction is connected reversed biased, its resistance is of the order of

The highest value reached by the voltage or current:

During the negative half-cycle of the half-wave rectification, the diode

The most common source of alternating voltage is:

When the pn-junction is in reversed biased, current flows through the junction due to the

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

The bridge circuit of full wave rectification uses

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

The value of output resistance of OP-AMOP is of the order of

The Instantaneous value of alternative current maybe:

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

When the pn-junction is forward biased. the current flows through it is of the order of

Electromagnetic waves transmit energy equal to

A digital system deals with quantities or variables which have

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

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

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