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

The RMS value of alternating current is:

Question # 2

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 3

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

Question # 4

The Instantaneous value of alternative current maybe:

Question # 5

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

Question # 6

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 7

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

Question # 8

Electromagnetic waves transmit energy equal to

Question # 9

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

Question # 10

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

Question # 11

The closed loop gain of the inverting amplifier is written as

Question # 12

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

Question # 13

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 14

A diode characteristic curve is a plot between

Question # 15

Conversion of alternating current into direct current is called

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
2 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
3 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
4 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
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 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
7 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
8 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
9 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°
10 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable

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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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