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

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 2

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

Question # 3

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

Question # 4

During the negative half-cycle of the half-wave rectification, the diode

Question # 5

The RMS value of alternating current is:

Question # 6

A diode characteristic curve is a plot between

Question # 7

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

Question # 8

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

Question # 9

In free space, the speed of electromagnetic waves is

Question # 10

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

Question # 11

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

Question # 12

The wave form of alternating voltage is the graph between:

Question # 13

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 14

The power factor of resonant series circuit is

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

Alternating current can be transmitted:

Question # 19

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

Question # 20

The phase angle of a series RLC circuit at resonance is

Question # 21

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

Question # 22

Alternating current is produced by a voltage source which polarity:

Question # 23

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

Question # 24

Chock consumes externally small

Question # 25

The closed loop gain of the inverting amplifier is written as

Question # 26

Transmitting antenna emits

Question # 27

The input resistance of the OP-AMP is the resistance between the

Question # 28

The highest value reached by the voltage or current:

Question # 29

Electromagnetic waves transmit energy equal to

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
3 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
4 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
5 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them
6 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
7 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
8 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
9 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
10 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105

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