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

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

Question # 2

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

Question # 3

The bridge circuit of full wave rectification uses

Question # 4

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

Question # 5

The waveform of alternating voltage is a:

Question # 6

The most common source of alternating voltage is:

Question # 7

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

Question # 8

OP-AMP has the following input terminals

Question # 9

The Instantaneous value of alternative current maybe:

Question # 10

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

Question # 11

The phase angle of a series RLC circuit at resonance is

Question # 12

Chock consumes externally small

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

A changing magnetic flux creates around itself

Question # 19

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

Question # 20

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

Question # 21

Which one of the following waves belongs to electromagnetic spectrum

Question # 22

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

Question # 23

Average value of A.C voltage during one cycle is

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

Transmitting antenna emits

Question # 28

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 29

The amplifier which us used to perform mathematical operations electronically is known as

Question # 30

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

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ECAT Class Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
2 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
3 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
4 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
5 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
6 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
7 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
8 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
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 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

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