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

Question # 2

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 7

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

Question # 8

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

Question # 9

Average value of A.C voltage during one cycle is

Question # 10

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

Question # 11

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

Question # 12

In free space, the speed of electromagnetic waves is

Question # 13

At resonance, the impedance of RLC series circuit is

Question # 14

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

Question # 15

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

Question # 16

In half wave rectification

Question # 17

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

Question # 18

Which of the following has a great concentration of impurity

Question # 19

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

Question # 20

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

Question # 21

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 22

The phase angle of a series RLC circuit at resonance is

Question # 23

The value of current gain of n-p-n transistor is of the order of

Question # 24

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

Question # 25

Alternating current can induce voltage because it has a

Question # 26

In series RC circuit when R=Xc, then the phase angle is

Question # 27

Peak value of alternative current is:

Question # 28

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

Question # 29

For normal operation of transistor, the batteries

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
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 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 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
6 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
7 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
8 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
9 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
10 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge

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