ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

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

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

The impedance of RLC series resonance circuit at resonant frequency is

Question # 2

The magnitude of alternative voltage V:

Question # 3

The RMS value of alternating current is:

Question # 4

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 10

OP-AMP has the following input terminals

Question # 11

Conversion of alternating current into direct current is called

Question # 12

The phase at the positive peak of an A.C. cycle is:

Question # 13

Which of the following has a great concentration of impurity

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 19

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 20

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

Question # 21

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 22

In which of the following components, pn-junction is used

Question # 23

The power factor of resonant series circuit is

Question # 24

Alternating current can induce voltage because it has a

Question # 25

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

Question # 26

The closed loop gain of the inverting amplifier is written as

Question # 27

When the p-n junction is forward biased its resistance is of the order of

Question # 28

During the positive half-cycle in the half-wave rectification,the diode

Question # 29

In RLC series circuit, resonance occurs when

Question # 30

The phase angle of a series RLC circuit at resonance is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
2 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
3 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
4 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
5 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
6 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
7 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
8 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
9 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
10 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these

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