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

Peak value of alternative current is:

Question # 2

Transmitting antenna emits

Question # 3

The basic circuit element in D.C. circuit is:

Question # 4

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

Question # 5

The RMS value of alternating current is:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

At resonance, the impedance of RLC series circuit is

Question # 10

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

Question # 11

The waveform of alternating voltage is a:

Question # 12

During each cycle, alternating voltage reaches a peak value

Question # 13

Average value of A.C voltage during one cycle is

Question # 14

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

Question # 15

Which one of the following waves belongs to electromagnetic spectrum

Question # 16

In frequency modulation (FM), the carrier waves amplitude

Question # 17

For normal operation of transistor, the batteries

Question # 18

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

Question # 19

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

Question # 20

The magnitude of alternative voltage V:

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

The sum of positive and negative peak values is called:

Question # 27

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

Question # 28

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

Question # 29

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

Question # 30

The closed loop gain of the inverting amplifier is written as

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
2 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
3 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
4 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
5 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
6 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
7 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
8 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
9 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
10 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them

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