ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

In half wave rectification

Question # 2

The most common source of alternating voltage is:

Question # 3

In which of the following components, pn-junction is used

Question # 4

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

Question # 5

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

Question # 6

Chock consumes externally small

Question # 7

The total reactance of a series RLC circuit at resonance is

Question # 8

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

Question # 9

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

Question # 10

The impedance of RLC series resonance circuit at resonant frequency is

Question # 11

For normal operation of transistor, the batteries

Question # 12

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 13

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

Question # 14

Conversion of alternating current into direct current is called

Question # 15

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

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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 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
3 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
4 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
5 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
6 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
7 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
8 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
9 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
10 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these

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