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

Chock consumes externally small

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

Electromagnetic waves transmit energy equal to

Question # 6

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

Question # 7

Which of the following has a great concentration of impurity

Question # 8

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

Question # 9

Which one of the following waves belongs to electromagnetic spectrum

Question # 10

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

Question # 11

The bridge circuit of full wave rectification uses

Question # 12

The RMS value of alternating current is:

Question # 13

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

Question # 14

The impedance of RLC series resonance circuit at resonant frequency is

Question # 15

A diode characteristic curve is a plot between

Question # 16

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

Question # 17

The total reactance of a series RLC circuit at resonance is

Question # 18

For normal operation of transistor, the batteries

Question # 19

At resonance, the impedance of RLC series circuit is

Question # 20

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

Question # 21

Alternating current can induce voltage because it has a

Question # 22

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

Question # 23

In free space, the speed of electromagnetic waves is

Question # 24

Transmitting antenna emits

Question # 25

Peak value of alternative current is:

Question # 26

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

Question # 27

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 28

The waveform of alternating voltage is a:

Question # 29

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

Question # 30

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

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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 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
3 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
4 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
5 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
6 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)
7 Mathematical manipulation of the two quantized states can be best carried if they are represented by
A. high - low
B. yes - no
C. on - off
D. 0 - 1
8 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
9 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
10 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

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