ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

OP-AMP has the following input terminals

Question # 2

The basic circuit elements of A.C circuit are

Question # 3

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

Question # 4

The RMS value of alternating current is:

Question # 5

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

Question # 6

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

Question # 7

An A.C varies as a function of

Question # 8

The impedance of RLC series resonance circuit at resonant frequency is

Question # 9

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

Question # 10

SI unit of impedance is

Question # 11

Which one of the following is correct?

Question # 12

Which of the following diode is used for the detection of light

Question # 13

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

Question # 14

The waveform of alternating voltage is a:

Question # 15

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

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Sr.# Question Answer
1 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
2 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
3 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
4 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
5 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
6 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
7 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
8 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
9 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
10 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
11 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
12 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
13 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
14 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
15 In free space, the speed of electromagnetic waves is
A. 3 x 108ms-1
B. 3 x 106ms-1
C. 4 x 107ms-1
D. 3 x 109ms-1

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