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

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

Question # 2

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

Question # 3

The time interval during which the Voltage source changes its polarity once is known as:

Question # 4

A digital system deals with quantities or variables which have

Question # 5

For normal operation of transistor, the batteries

Question # 6

OP-AMP has the following input terminals

Question # 7

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 8

The bridge circuit of full wave rectification uses

Question # 9

The device which allows only the flow of an A.C. through a circuit is

Question # 10

The value of current gain of n-p-n transistor is of the order of

Question # 11

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 12

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

Question # 13

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

Question # 14

Average value of A.C voltage during one cycle is

Question # 15

When the pn-junction is forward biased. the current flows through it is of the order of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
2 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
3 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
4 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
5 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
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 a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
8 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
9 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
10 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

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