ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

Question # 6

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

Question # 7

The most common source of alternating voltage is:

Question # 8

The closed loop gain of the inverting amplifier is written as

Question # 9

Which of the following has a great concentration of impurity

Question # 10

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

Question # 11

A P-N juction or semiconductor diode cannot be used as

Question # 12

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 13

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

Question # 14

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 15

In free space, the speed of electromagnetic waves is

Question # 16

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

Question # 17

Most OP-AMP operates with

Question # 18

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 19

The magnitude of alternative voltage V:

Question # 20

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 21

The impedance of RLC series resonance circuit at resonant frequency is

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

The sum of positive and negative peak values is called:

Question # 27

The basic circuit elements of A.C circuit are

Question # 28

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

Question # 29

For the normal operation of the transistor, its

Question # 30

An A.C varies as a function of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
2 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
3 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
4 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
5 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage
6 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
7 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
8 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
9 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°
10 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

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