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

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

Question # 2

Which of the following has a great concentration of impurity

Question # 3

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

Question # 4

The phase angle of a series RLC circuit at resonance is

Question # 5

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

Question # 6

Conversion of alternating current into direct current is called

Question # 7

In frequency modulation (FM), the carrier waves amplitude

Question # 8

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 9

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

Question # 10

The value of the potential difference across the depletion region for the case of germanium is

Question # 11

The bridge circuit of full wave rectification uses

Question # 12

The impedance of RLC series resonance circuit at resonant frequency is

Question # 13

The sum of positive and negative peak values is called:

Question # 14

Alternating current is produced by a voltage source which polarity:

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
2 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
3 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
4 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
5 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
6 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
7 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
8 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
9 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
10 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF

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