ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

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

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

In free space, the speed of electromagnetic waves is

Question # 2

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

Question # 3

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 4

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 5

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

During the negative half-cycle of the half-wave rectification, the diode

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

A digital system deals with quantities or variables which have

Question # 15

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

Question # 16

The total reactance of a series RLC circuit at resonance is

Question # 17

The input resistance of the OP-AMP is the resistance between the

Question # 18

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

Question # 19

In RLC series circuit, resonance occurs when

Question # 20

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 21

In frequency modulation (FM), the carrier waves amplitude

Question # 22

Which of the following has a great concentration of impurity

Question # 23

In a transistor, if the central region is n-type, then this type of transistor is known as

Question # 24

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

Question # 25

The waveform of alternating voltage is a:

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

The wave form of alternating voltage is the graph between:

Question # 30

The bridge circuit of full wave rectification uses

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
3 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
4 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
5 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
6 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
7 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
8 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
9 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
10 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these

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