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

Question # 2

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 3

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 4

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

Question # 5

Electromagnetic waves transmit energy equal to

Question # 6

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

Question # 7

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

Question # 8

Most OP-AMP operates with

Question # 9

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

Question # 10

Alternating current is produced by a voltage source which polarity:

Question # 11

In series RC circuit when R=Xc, then the phase angle is

Question # 12

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 13

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 14

The basic circuit element in D.C. circuit is:

Question # 15

In describing functions of digital systems, a closed switch will be shown as

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
3 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
4 In n-p-n transistor, emitter base junction is kept
A. reversed
B. forward biased
C. may be reversed or may be forward biased
D. none of these
5 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
6 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
7 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
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 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these

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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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