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

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 2

The input resistance of the OP-AMP is the resistance between the

Question # 3

Which of the following has a great concentration of impurity

Question # 4

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

Question # 5

The impedance of RLC series resonance circuit at resonant frequency is

Question # 6

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

Question # 7

The most common source of alternating voltage is:

Question # 8

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

Question # 9

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 10

The wave form of alternating voltage is the graph between:

Question # 11

In RLC series circuit, resonance occurs when

Question # 12

Which one of the following is correct?

Question # 13

An A.C varies as a function of

Question # 14

Alternating current can be transmitted:

Question # 15

In frequency modulation (FM), the carrier waves amplitude

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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)
2 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
3 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
4 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
5 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
6 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
7 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
8 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
9 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
10 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these

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