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 average of A.C. current and voltage over a complete cycle is

Question # 2

The basic circuit elements of A.C circuit are

Question # 3

The output voltage of half wave rectification is in the form of

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

In RLC series circuit, resonance occurs when

Question # 9

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

Question # 10

The alternative voltage of current is actually measured by:

Question # 11

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

Question # 12

The length of rotating vector (on a certain scale) represents the:

Question # 13

The device which allows only the flow of an A.C. through a circuit is

Question # 14

Most OP-AMP operates with

Question # 15

Which of the following has a great concentration of impurity

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
2 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
3 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
4 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
5 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
6 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
7 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
8 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
9 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
10 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases

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