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 is produced by a voltage source which polarity:

Question # 2

OP-AMP has the following input terminals

Question # 3

Peak value of alternative current is:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

A P-N juction or semiconductor diode cannot be used as

Question # 8

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 9

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

Question # 10

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 11

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

Question # 12

In half wave rectification

Question # 13

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

Question # 14

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 15

During each cycle, alternating voltage reaches a peak value

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Which of the following diode is used for the detection of light
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
2 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
3 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
4 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
5 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
6 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
7 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
8 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
9 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
10 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf

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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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