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

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

Question # 2

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

Question # 3

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

Question # 4

Transmitting antenna emits

Question # 5

In a transistor, the central region is called

Question # 6

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

Question # 7

The phase angle of a series RLC circuit at resonance is

Question # 8

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

Question # 9

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

Question # 10

In free space, the speed of electromagnetic waves is

Question # 11

A digital system deals with quantities or variables which have

Question # 12

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

Question # 13

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

Question # 14

A P-N juction or semiconductor diode cannot be used as

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
2 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
3 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
4 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
5 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
6 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
7 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
8 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
9 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1
10 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)

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