ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

Alternating current can induce voltage because it has a

Question # 2

Which of the following diodes can operate in the reverse biased condition

Question # 3

The Instantaneous value of alternative current maybe:

Question # 4

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 5

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

Question # 6

The impedance of RLC series resonance circuit at resonant frequency is

Question # 7

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

Question # 8

Which of the following has a great concentration of impurity

Question # 9

An A.C varies as a function of

Question # 10

The phase angle of a series RLC circuit at resonance is

Question # 11

The alternative voltage of current is actually measured by:

Question # 12

A changing magnetic flux creates around itself

Question # 13

For the normal operation of the transistor, its

Question # 14

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

Question # 15

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
2 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
3 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
4 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
5 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
6 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
7 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
8 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
9 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
10 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

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