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

Question # 2

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

Question # 3

SI unit of impedance is

Question # 4

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

Question # 5

In RLC series circuit, resonance occurs when

Question # 6

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

Question # 7

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

Question # 8

Alternating current can be transmitted:

Question # 9

Which one of the following waves belongs to electromagnetic spectrum

Question # 10

A diode characteristic curve is a plot between

Question # 11

During each cycle, alternating voltage reaches a peak value

Question # 12

A digital system deals with quantities or variables which have

Question # 13

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 14

The RMS value of alternating current is:

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

The time interval during which the Voltage source changes its polarity once is known as:

Question # 20

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

Question # 21

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

Question # 22

OP-AMP has the following input terminals

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

In half wave rectification

Question # 28

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

Question # 29

A changing magnetic flux creates around itself

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
2 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
3 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)
4 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
5 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
6 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
7 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
8 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
9 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
10 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

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