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

The closed loop gain of the non-inverting amplifier is given by

Question # 2

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

Question # 3

Chock consumes externally small

Question # 4

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

Question # 5

The basic circuit elements of A.C circuit are

Question # 6

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

Question # 7

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

Question # 8

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 13

In frequency modulation (FM), the carrier waves amplitude

Question # 14

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 15

Peak value of alternative current is:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
2 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
3 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
4 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
5 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
6 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
7 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°
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 phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
10 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5

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