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

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 3

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

Question # 4

The bridge circuit of full wave rectification uses

Question # 5

Alternating current can be transmitted:

Question # 6

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 7

During each cycle, alternating voltage reaches a peak value

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

For a n-p-n transistor, the conventional current equation can be written as

Question # 12

In half wave rectification

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In a transistor, the central region is called
A. collector
B. emitter
C. base
D. none of them
2 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
3 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
4 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
5 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
6 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
7 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
8 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
9 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
10 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

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