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

OP-AMP has the following input terminals

Question # 2

The bridge circuit of full wave rectification uses

Question # 3

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

Question # 4

The highest value reached by the voltage or current:

Question # 5

The basic circuit elements of A.C circuit are

Question # 6

The phase angle of a series RLC circuit at resonance is

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The impedance of RLC series resonance circuit at resonant frequency is

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

During each cycle, alternating voltage reaches a peak value

Question # 16

Which one of the following is correct?

Question # 17

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

Question # 18

Most OP-AMP operates with

Question # 19

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

Question # 20

A diode characteristic curve is a plot between

Question # 21

Chock consumes externally small

Question # 22

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

Question # 23

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

Question # 24

Alternating current can be transmitted:

Question # 25

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

Question # 26

The wave form of alternating voltage is the graph between:

Question # 27

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

Question # 28

A changing magnetic flux creates around itself

Question # 29

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
2 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
3 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
4 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
5 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
6 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
7 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
8 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
9 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
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
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

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