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

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

Question # 2

The RMS value of alternating current is:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Alternating current can be transmitted:

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

During each cycle, alternating voltage reaches a peak value

Question # 11

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

Question # 12

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

Question # 13

Which one of the following waves belongs to electromagnetic spectrum

Question # 14

Conversion of alternating current into direct current is called

Question # 15

Most OP-AMP operates with

Question # 16

The length of rotating vector (on a certain scale) represents the:

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

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 # 22

Electromagnetic waves transmit energy equal to

Question # 23

The magnitude of alternative voltage V:

Question # 24

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

Question # 25

In a transistor, the central region is called

Question # 26

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

Question # 27

The bridge circuit of full wave rectification uses

Question # 28

Peak value of alternative current is:

Question # 29

Which one of the following is correct?

Question # 30

The power factor of resonant series circuit is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
3 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
4 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
5 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
6 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
7 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
8 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
9 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
10 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero

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