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

The total reactance of a series RLC circuit at resonance is

Question # 2

The RMS value of alternating current is:

Question # 3

An A.C varies as a function of

Question # 4

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

Question # 5

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

Question # 6

In frequency modulation (FM), the carrier waves amplitude

Question # 7

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

Question # 8

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

Question # 9

The open loop gain of OP-AMP is of the order of

Question # 10

The impedance of RLC series resonance circuit at resonant frequency is

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

A changing magnetic flux creates around itself

Question # 15

The power factor of resonant series circuit is

Question # 16

Which one of the following is correct?

Question # 17

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

Question # 18

Alternating current can induce voltage because it has a

Question # 19

The magnitude of alternative voltage V:

Question # 20

Transmitting antenna emits

Question # 21

Conversion of alternating current into direct current is called

Question # 22

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

Question # 23

Alternating current can be transmitted:

Question # 24

The waveform of alternating voltage is a:

Question # 25

In RLC series circuit, resonance occurs when

Question # 26

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

Question # 27

Electromagnetic waves transmit energy equal to

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
2 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
3 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
4 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
5 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
6 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
7 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
8 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
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 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value

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