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

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

Question # 2

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

Question # 3

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

Question # 4

Alternating current can induce voltage because it has a

Question # 5

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 # 6

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 # 7

Conversion of alternating current into direct current is called

Question # 8

The magnitude of alternative voltage V:

Question # 9

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

Question # 10

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

Question # 11

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 12

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 13

The basic circuit elements of A.C circuit are

Question # 14

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

Question # 15

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

Question # 16

During the negative half-cycle of the half-wave rectification, the diode

Question # 17

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 18

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

Question # 19

Most OP-AMP operates with

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

A digital system deals with quantities or variables which have

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

Chock consumes externally small

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
2 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
3 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
4 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC
5 Which of the following diodes can operate in the reverse biased condition
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
6 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
7 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)
8 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
9 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
10 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°

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