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 basic circuit element in D.C. circuit is:

Question # 2

In frequency modulation (FM), the carrier waves amplitude

Question # 3

The closed loop gain of the inverting amplifier is written as

Question # 4

Average value of A.C voltage during one cycle is

Question # 5

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 6

The phase angle of a series RLC circuit at resonance is

Question # 7

The output voltage of half wave rectification is in the form of

Question # 8

The wave form of alternating voltage is the graph between:

Question # 9

Which of the following diode is used for the detection of light

Question # 10

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

Question # 11

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

Question # 12

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 13

In free space, the speed of electromagnetic waves is

Question # 14

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

Question # 15

Mathematical manipulation of the two quantized states can be best carried if they are represented by

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
2 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
3 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
4 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
5 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
6 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
7 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
8 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
9 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
10 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply

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