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 RMS value of alternating current is:

Question # 2

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

Question # 3

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 4

Peak value of alternative current is:

Question # 5

In free space, the speed of electromagnetic waves is

Question # 6

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 7

The closed loop gain of the non-inverting amplifier is given by

Question # 8

During the positive half-cycle in the half-wave rectification,the diode

Question # 9

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 10

In frequency modulation (FM), the carrier waves amplitude

Question # 11

In half wave rectification

Question # 12

A digital system deals with quantities or variables which have

Question # 13

A changing magnetic flux creates around itself

Question # 14

In RLC series circuit, resonance occurs when

Question # 15

Transmitting antenna emits

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
2 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
3 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
4 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°
5 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
6 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
7 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
8 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
9 The bridge circuit of full wave rectification uses
A. one diode
B. two diode
C. three diode
D. four diode
10 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays

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