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

When the p-n junction is forward biased its resistance is of the order of

Question # 2

The bridge circuit of full wave rectification uses

Question # 3

In half wave rectification

Question # 4

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

Question # 5

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 6

The phase angle of a series RLC circuit at resonance is

Question # 7

Which one of the following waves belongs to electromagnetic spectrum

Question # 8

Alternating current can induce voltage because it has a

Question # 9

Electromagnetic waves transmit energy equal to

Question # 10

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

Question # 11

OP-AMP has the following input terminals

Question # 12

An A.C varies as a function of

Question # 13

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 # 14

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

Question # 15

At resonance, the phase angle for RLC series resonance circuit equals

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
2 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
3 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
4 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
5 The amplifier which us used to perform mathematical operations electronically is known as
A. calculator
B. OP-AMP
C. computer
D. any one of them
6 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
7 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
8 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
9 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
10 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms

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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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