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

In RLC series circuit, resonance occurs when

Question # 2

Alternating current is produced by a voltage source which polarity:

Question # 3

The total reactance of a series RLC circuit at resonance is

Question # 4

A diode characteristic curve is a plot between

Question # 5

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

Question # 6

The wave form of alternating voltage is the graph between:

Question # 7

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 8

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

Question # 9

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

Question # 10

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 11

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

Question # 12

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

Question # 13

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 14

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

Question # 15

The bridge circuit of full wave rectification uses

Question # 16

The alternative voltage of current is actually measured by:

Question # 17

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

Question # 18

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 # 19

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

Question # 20

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 21

Electromagnetic waves transmit energy equal to

Question # 22

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

Question # 23

Which of the following diode is used for the detection of light

Question # 24

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

Question # 25

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 26

Which one of the following waves belongs to electromagnetic spectrum

Question # 27

The power factor of resonant series circuit is

Question # 28

The basic circuit element in D.C. circuit is:

Question # 29

A changing magnetic flux creates around itself

Question # 30

Peak value of alternative current is:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
2 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
3 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
4 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
5 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
6 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
7 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
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
8 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
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 For a n-p-n transistor, the conventional current equation can be written as
A. IE+ IC= IB
B. IC- IB= IE
C. IC+ IB= IE
D. IB+ IE= IC

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