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 free space, the speed of electromagnetic waves is

Question # 2

The sum of positive and negative peak values is called:

Question # 3

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 4

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 5

Alternating current can induce voltage because it has a

Question # 6

The device which allows only the flow of an A.C. through a circuit is

Question # 7

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 8

The magnitude of alternative voltage V:

Question # 9

SI unit of impedance is

Question # 10

The value of the input resistance of OP-AMP is of the order of

Question # 11

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

Question # 12

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

Question # 13

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 14

A digital system deals with quantities or variables which have

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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°
2 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
3 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
4 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
5 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
6 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
7 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
8 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
9 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
10 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage

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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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