ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

Try The 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

For a n-p-n transistor, the conventional current equation can be written as

Question # 2

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 3

Which one of the following is correct?

Question # 4

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 5

The phase at the positive peak of an A.C. cycle is:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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 # 10

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

Question # 11

The alternative voltage of current is actually measured by:

Question # 12

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 # 13

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 14

Most OP-AMP operates with

Question # 15

Which of the following has a great concentration of impurity

Question # 16

Alternating current is produced by a voltage source which polarity:

Question # 17

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

Question # 18

Average value of A.C voltage during one cycle is

Question # 19

In a transistor, the central region is called

Question # 20

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 21

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

Question # 22

The highest value reached by the voltage or current:

Question # 23

During each cycle, alternating voltage reaches a peak value

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

Conversion of alternating current into direct current is called

Question # 28

A changing magnetic flux creates around itself

Question # 29

The phase angle of a series RLC circuit at resonance is

Question # 30

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
3 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
4 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
5 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
6 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
7 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
8 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
9 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
10 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier

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