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 digital system deals with quantities or variables which have

Question # 2

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

Question # 3

The value of output resistance of OP-AMOP is of the order of

Question # 4

An A.C varies as a function of

Question # 5

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 6

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

Question # 7

Alternating current is produced by a voltage source which polarity:

Question # 8

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

Question # 9

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 10

In half wave rectification

Question # 11

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

Question # 12

The total reactance of a series RLC circuit at resonance is

Question # 13

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

Question # 14

The phase at the positive peak of an A.C. cycle is:

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
2 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
3 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
4 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
5 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
6 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
7 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
8 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
9 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
10 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°

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