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

Alternating current can be transmitted:

Question # 2

Electromagnetic waves transmit energy equal to

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

In n-p-n transistor, emitter base junction is kept

Question # 9

Transmitting antenna emits

Question # 10

The wave form of alternating voltage is the graph between:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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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 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
3 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)
4 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
5 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
6 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
7 Which one of the following is correct?
A. Vo= 1.414 Vrms
B. Iams= 1.414 Io
C. VO = 10.70 Vrms
D. Both a and b
8 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large
9 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
10 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°

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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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