ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

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 # 2

Alternating current can induce voltage because it has a

Question # 3

Average value of A.C voltage during one cycle is

Question # 4

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

Question # 5

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

Question # 6

For the normal operation of the transistor, its

Question # 7

A changing magnetic flux creates around itself

Question # 8

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

Question # 9

The total reactance of a series RLC circuit at resonance is

Question # 10

In series RC circuit when R=Xc, then the phase angle is

Question # 11

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

Question # 12

The closed loop gain of the inverting amplifier is written as

Question # 13

The RMS value of alternating current is:

Question # 14

At resonance, the phase angle for RLC series resonance circuit equals

Question # 15

The wave form of alternating voltage is the graph between:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The value of the potential difference across the depletion region for the case of germanium is
A. 0.3 V
B. 0.5 V
C. 0.7 V
D. 0.9 V
2 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
3 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
4 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
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
5 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
6 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
7 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
8 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
9 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
10 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value

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