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

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

Question # 2

Alternating current can induce voltage because it has a

Question # 3

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

Question # 4

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

Question # 5

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 6

Which one of the following is correct?

Question # 7

The closed loop gain of the inverting amplifier is written as

Question # 8

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 # 9

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

Question # 10

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

Question # 11

A changing magnetic flux creates around itself

Question # 12

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

Question # 13

The open loop gain of OP-AMP is of the order of

Question # 14

In a transistor, the central region is called

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 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
2 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
3 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
4 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
5 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°
6 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
7 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
8 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
9 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
10 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

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