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

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 # 2

An A.C varies as a function of

Question # 3

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

Question # 4

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

Question # 5

SI unit of impedance is

Question # 6

Which one of the following waves belongs to electromagnetic spectrum

Question # 7

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

Question # 8

At resonance, the impedance of RLC series circuit is

Question # 9

The sum of positive and negative peak values is called:

Question # 10

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 11

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

Question # 12

When the emitter-base junction of a transistor is reverse biased, collector current

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

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
2 The R1= infinity and R2= 0, then the gain of non-inverting amplifier is
A. zero
B. infinity
C. one
D. any one of these
3 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
4 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
5 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
6 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
7 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
8 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
9 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
10 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these

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