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 emitter-base junction of a transistor is reverse biased, collector current

Question # 2

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 3

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

Question # 4

The amplifier which us used to perform mathematical operations electronically is known as

Question # 5

In n-p-n transistor, emitter base junction is kept

Question # 6

In a transistor, the central region is called

Question # 7

The phase at the positive peak of an A.C. cycle is:

Question # 8

In which of the following components, pn-junction is used

Question # 9

OP-AMP has the following input terminals

Question # 10

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

Question # 11

The sum of positive and negative peak values is called:

Question # 12

During the positive half-cycle in the half-wave rectification,the diode

Question # 13

The basic circuit element in A.C. circuits are:

Question # 14

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

Question # 15

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
3 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
4 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
5 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
6 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
7 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
8 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
9 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
10 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

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