ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

In which of the following components, pn-junction is used

Question # 2

At resonance, the impedance of RLC series circuit is

Question # 3

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

Question # 4

A P-N juction or semiconductor diode cannot be used as

Question # 5

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

Question # 6

During each cycle, alternating voltage reaches a peak value

Question # 7

The phase angle of a series RLC circuit at resonance is

Question # 8

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

Question # 9

For the normal operation of the transistor, its

Question # 10

In half wave rectification

Question # 11

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 12

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

Question # 13

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 # 14

The sum of positive and negative peak values is called:

Question # 15

The alternative voltage of current is actually measured by:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states
2 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
3 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
4 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
5 The total reactance of a series RLC circuit at resonance is
A. zero
B. Equal to the resistance
C. Infinity
D. Capacitive
6 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
7 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
8 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°
9 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
10 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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