ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

Chock consumes externally small

Question # 2

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 3

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

Question # 4

For the normal operation of the transistor, its

Question # 5

The basic circuit element in D.C. circuit is:

Question # 6

In n-p-n transistor, emitter base junction is kept

Question # 7

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

Question # 8

The magnitude of alternative voltage V:

Question # 9

The most common source of alternating voltage is:

Question # 10

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

Question # 11

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

Question # 12

Which of the following has a great concentration of impurity

Question # 13

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

Question # 14

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

Question # 15

The waveform of alternating voltage is a:

Question # 16

Alternating current is produced by a voltage source which polarity:

Question # 17

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

Question # 18

The impedance of RLC series resonance circuit at resonant frequency is

Question # 19

A diode characteristic curve is a plot between

Question # 20

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

Question # 21

A digital system deals with quantities or variables which have

Question # 22

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

Question # 23

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

Question # 24

The bridge circuit of full wave rectification uses

Question # 25

The sum of positive and negative peak values is called:

Question # 26

In free space, the speed of electromagnetic waves is

Question # 27

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

Question # 28

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

Question # 29

For normal operation of transistor, the batteries

Question # 30

In a transistor, the central region is called

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Sr.# Question Answer
1 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
2 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
3 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
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 highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
6 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
7 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
8 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
9 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
10 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
11 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
12 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
13 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
14 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
15 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
16 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
17 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
18 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
19 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
20 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
21 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
22 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)
23 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
24 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
25 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
26 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
27 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. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
28 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
29 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
30 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply

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