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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 6

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

Question # 7

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Alternating current can induce voltage because it has a

Question # 12

In frequency modulation (FM), the carrier waves amplitude

Question # 13

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

Question # 14

The highest value reached by the voltage or current:

Question # 15

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

Question # 16

The total reactance of a series RLC circuit at resonance is

Question # 17

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 18

In RLC series circuit, resonance occurs when

Question # 19

The most common source of alternating voltage is:

Question # 20

The power factor of resonant series circuit is

Question # 21

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 # 22

During the positive half-cycle in the half-wave rectification,the diode

Question # 23

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

Question # 24

The bridge circuit of full wave rectification uses

Question # 25

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

Question # 26

Electromagnetic waves transmit energy equal to

Question # 27

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

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

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

Question # 30

Most OP-AMP operates with

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
2 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
3 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
4 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)
5 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
6 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
7 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
8 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
9 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
10 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states

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