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

Question # 2

The power factor of resonant series circuit is

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

In RLC series circuit, resonance occurs when

Question # 10

The wave form of alternating voltage is the graph between:

Question # 11

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

Question # 12

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

Question # 13

Electromagnetic waves transmit energy equal to

Question # 14

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

Question # 15

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

Question # 16

Conversion of alternating current into direct current is called

Question # 17

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

Which of the following has a great concentration of impurity

Question # 23

At resonance, the phase angle for RLC series resonance circuit equals

Question # 24

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

Question # 25

The highest value reached by the voltage or current:

Question # 26

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 # 27

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

Question # 28

For normal operation of transistor, the batteries

Question # 29

For the normal operation of the transistor, its

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
2 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
3 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
4 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
5 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
6 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
7 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
8 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
9 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
10 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant

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