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

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

Question # 2

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

Question # 3

OP-AMP has the following input terminals

Question # 4

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

Question # 5

The wave form of alternating voltage is the graph between:

Question # 6

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 # 7

Which of the following diodes can operate in the reverse biased condition

Question # 8

The alternative voltage of current is actually measured by:

Question # 9

Chock consumes externally small

Question # 10

Electromagnetic waves transmit energy equal to

Question # 11

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

Question # 12

The basic circuit elements of A.C circuit are

Question # 13

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

Question # 14

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

Question # 15

The most common source of alternating voltage is:

Question # 16

The value of current gain of n-p-n transistor is of the order of

Question # 17

An A.C varies as a function of

Question # 18

The bridge circuit of full wave rectification uses

Question # 19

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

Question # 20

The time interval during which the Voltage source changes its polarity once is known as:

Question # 21

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 22

In series RC circuit when R=Xc, then the phase angle is

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 27

In n-p-n transistor, emitter base junction is kept

Question # 28

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 # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The waveform of alternating voltage is a:
A. Square
B. Rectangular
C. Saw-tooth
D. Sinusoidal
2 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
3 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
4 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
5 The basic circuit elements of A.C circuit are
A. Resistor
B. Inductor
C. Capacitor
D. All the three
6 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
7 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
8 The amplifier which us used to perform mathematical operations electronically is known as
A. calculator
B. OP-AMP
C. computer
D. any one of them
9 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
10 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these

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