ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 2

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

Question # 3

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 # 4

OP-AMP has the following input terminals

Question # 5

In frequency modulation (FM), the carrier waves amplitude

Question # 6

Average value of A.C voltage during one cycle is

Question # 7

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 8

Transmitting antenna emits

Question # 9

A changing magnetic flux creates around itself

Question # 10

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

Question # 11

In free space, the speed of electromagnetic waves is

Question # 12

The total reactance of a series RLC circuit at resonance is

Question # 13

For the normal operation of the transistor, its

Question # 14

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

Question # 15

The value of the input resistance of OP-AMP is of the order of

Question # 16

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

Question # 17

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 18

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

Question # 19

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 20

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 21

The basic circuit element in A.C. circuits are:

Question # 22

The most common source of alternating voltage is:

Question # 23

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

Question # 24

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 # 25

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

Question # 26

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

Question # 27

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

Question # 28

The wave form of alternating voltage is the graph between:

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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°
3 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)
4 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts
5 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
6 The basic circuit elements of A.C circuit are
A. Resistor
B. Inductor
C. Capacitor
D. All the three
7 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
8 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
9 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
10 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5

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