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

The total reactance of a series RLC circuit at resonance is

Question # 2

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

Question # 3

OP-AMP has the following input terminals

Question # 4

The wave form of alternating voltage is the graph between:

Question # 5

The time interval during which the Voltage source changes its polarity once is known as:

Question # 6

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

Question # 7

A diode characteristic curve is a plot between

Question # 8

Which one of the following is correct?

Question # 9

Alternating current can be transmitted:

Question # 10

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

Question # 11

At resonance, the impedance of RLC series circuit is

Question # 12

The highest value reached by the voltage or current:

Question # 13

In n-p-n transistor, emitter base junction is kept

Question # 14

A digital system deals with quantities or variables which have

Question # 15

The length of rotating vector (on a certain scale) represents the:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
2 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
3 Which of the following diodes can operate in the reverse biased condition
A. photo diode
B. light emitting diode
C. photo voltaic cell
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 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
6 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
7 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
8 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
9 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
10 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these

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