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

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 2

In RLC series circuit, resonance occurs when

Question # 3

In free space, the speed of electromagnetic waves is

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

During the negative half-cycle of the half-wave rectification, the diode

Question # 8

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

Question # 9

The total reactance of a series RLC circuit at resonance is

Question # 10

Alternating current is produced by a voltage source which polarity:

Question # 11

The output voltage of half wave rectification is in the form of

Question # 12

Transmitting antenna emits

Question # 13

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

Question # 14

SI unit of impedance is

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
3 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
4 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
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 phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
7 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
8 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
9 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
10 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these

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