ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

Try The MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

The output voltage of half wave rectification is in the form of

Question # 2

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 3

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

Question # 4

For normal operation of transistor, the batteries

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The most common source of alternating voltage is:

Question # 9

A changing magnetic flux creates around itself

Question # 10

The closed loop gain of the inverting amplifier is written as

Question # 11

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

Question # 12

Which one of the following is correct?

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 During the positive half-cycle in the half-wave rectification,the diode
A. does not conduct
B. conducts
C. either of these
D. neither of these
3 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
4 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
5 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
6 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
7 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
8 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
9 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
10 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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