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

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 2

The power factor of resonant series circuit is

Question # 3

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

Question # 4

Alternating current can be transmitted:

Question # 5

An A.C varies as a function of

Question # 6

The device which allows only the flow of an A.C. through a circuit is

Question # 7

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

Question # 8

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 9

Average value of A.C voltage during one cycle is

Question # 10

The phase angle of a series RLC circuit at resonance is

Question # 11

The average of A.C. current and voltage over a complete cycle is

Question # 12

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

Question # 13

The bridge circuit of full wave rectification uses

Question # 14

The impedance of RLC series resonance circuit at resonant frequency is

Question # 15

A digital system deals with quantities or variables which have

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage
2 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
3 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
4 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
5 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
6 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
7 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
8 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
9 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°
10 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these

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