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

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

Question # 2

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

Question # 3

In frequency modulation (FM), the carrier waves amplitude

Question # 4

In a transistor, the central region is called

Question # 5

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 6

Which one of the following waves belongs to electromagnetic spectrum

Question # 7

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

Question # 8

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

Question # 9

A changing magnetic flux creates around itself

Question # 10

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

Question # 11

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

Question # 12

Alternating current can induce voltage because it has a

Question # 13

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

Question # 14

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 # 15

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 16

The impedance of RLC series resonance circuit at resonant frequency is

Question # 17

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

Question # 18

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

Question # 19

Average value of A.C voltage during one cycle is

Question # 20

Peak value of alternative current is:

Question # 21

During each cycle, alternating voltage reaches a peak value

Question # 22

The magnitude of alternative voltage V:

Question # 23

An A.C varies as a function of

Question # 24

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

Question # 25

A digital system deals with quantities or variables which have

Question # 26

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

A diode characteristic curve is a plot between

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
3 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
4 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
5 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)
6 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
7 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
8 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
9 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
10 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

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