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

During each cycle, alternating voltage reaches a peak value

Question # 2

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

Question # 3

The impedance of RLC series resonance circuit at resonant frequency is

Question # 4

In RLC series circuit, resonance occurs when

Question # 5

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

Question # 6

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

Question # 7

In a transistor, the central region is called

Question # 8

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

Question # 9

A diode characteristic curve is a plot between

Question # 10

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 11

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

Question # 12

A changing magnetic flux creates around itself

Question # 13

Chock consumes externally small

Question # 14

Peak value of alternative current is:

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

The power factor of resonant series circuit is

Question # 20

The input resistance of the OP-AMP is the resistance between the

Question # 21

The RMS value of alternating current is:

Question # 22

Which of the following has a great concentration of impurity

Question # 23

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

Question # 24

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 25

In frequency modulation (FM), the carrier waves amplitude

Question # 26

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

Question # 27

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

Question # 28

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 # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
2 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
3 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
4 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
5 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
6 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
7 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
8 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
9 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
10 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these

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