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

Question # 1

At resonance frequency the impedance of parallel resonance circuit is

Maximum A
Minimum B
Zero C
None of the above D

Question # 2

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 # 3

The phase angle of a series RLC circuit at resonance is

180° A
90° B
0° C
None of the these D

Question # 4

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 # 5

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 # 6

The RMS value of alternating current is:

0.7 times at the peak value A
0.5 times the peak value B
0.7 times the Instantaneous value C
Equal to maximum voltage D
None of these E

Question # 7

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 # 8

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 # 9

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 # 10

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

A rectifier A
Detector B
Oscillator C
An amplifier D

Question # 11

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Decreases A
Increases B
Does not change C
Momentarily goes to zero D

Question # 12

In a normally biased n-p-n transistor, an electron c current I_Eflows from the

emitter into the base A
collector into the base B
base into collector C
none of these D

Question # 13

The output voltage of half wave rectification is in the form of

a smooth curve A
a smooth wave B
pulses C
all of the above D

Question # 14

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 # 15

Conversion of alternating current into direct current is called

amplification A
rectification B
conduction C
polarization D

Question # 16

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 # 17

OP-AMP has the following input terminals

one A
two B
three C
four D

Question # 18

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 # 19

If the value of C in a series RLC circuit is increased, the resonant frequency

Is not affected A
Increase B
Remains the same C
Decreases D

Question # 20

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

0° A
90° B
70° C
45° D

Question # 21

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 # 22

The alternative voltage of current is actually measured by:

Its RMS value A
Square root of its mean square value B
Instantaneous value C
Peak value D
Both (A) and (B) E

Question # 23

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

Reverses A
Increases B
Decreases C
Stops D

Question # 24

At resonance, the phase angle for RLC series resonance circuit equals

0° A
90° B
180° C
270° D

Question # 25

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 # 26

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

Voltage A
Current B
Impedance C
Reactance D

Question # 27

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 # 28

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

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

Question # 29

The amplifier which us used to perform mathematical operations electronically is known as

calculator A
OP-AMP B
computer C
any one of them D

Question # 30

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

Sr.#	Question	Answer
1	At resonance, the impedance of RLC series circuit is	A. Maximum B. Zero C. Minimum D. Determinate
2	In a transistor, the central region is called	A. collector B. emitter C. base D. none of them
3	Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:	A. Peak value B. RMS value C. Instantaneous value D. Peak-to-peak value
4	A resonance curve for RLC series circuit is a plot of frequency versus	A. Voltage B. Current C. Impedance D. Reactance
5	The amplifier which us used to perform mathematical operations electronically is known as	A. calculator B. OP-AMP C. computer D. any one of them
6	The open loop gain of OP-AMP is of the order of	A. 10² B. 10³ C. 10⁴ D. 10⁵
7	When the pn-junction is in reversed biased, current flows through the junction due to the	A. majority carriers B. minority carriers C. either of them D. none of them
8	A diode characteristic curve is a plot between	A. current and time B. voltage and time C. voltage and current D. forward voltage and reversed voltage
9	If the value of C in a series RLC circuit is increased, the resonant frequency	A. Is not affected B. Increase C. Remains the same D. Decreases
10	The phase angle of a series RLC circuit at resonance is	A. 180° B. 90° C. 0° D. None of the 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

At resonance frequency the impedance of parallel resonance circuit is

The closed loop gain of the inverting amplifier is written as

The phase angle of a series RLC circuit at resonance is

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

Which one of the following is correct?

The RMS value of alternating current is:

A changing magnetic flux creates around itself

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

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

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

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

In a normally biased n-p-n transistor, an electron c current IEflows from the

The output voltage of half wave rectification is in the form of

Alternating current is produced by a voltage source which polarity:

Conversion of alternating current into direct current is called

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

OP-AMP has the following input terminals

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

If the value of C in a series RLC circuit is increased, the resonant frequency

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

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

The alternative voltage of current is actually measured by:

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

At resonance, the phase angle for RLC series resonance circuit equals

The highest value reached by the voltage or current:

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

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

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

The amplifier which us used to perform mathematical operations electronically is known as

In half wave rectification

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In a normally biased n-p-n transistor, an electron c current I_Eflows from the

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