ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

A changing magnetic flux creates around itself

Question # 2

For normal operation of transistor, the batteries

Question # 3

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

Question # 4

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

Question # 5

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 6

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

Question # 7

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

Question # 8

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 9

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

Question # 10

The RMS value of alternating current is:

Question # 11

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

Question # 12

Which of the following has a great concentration of impurity

Question # 13

The value of the potential difference across the depletion region for the case of germanium is

Question # 14

The phase at the positive peak of an A.C. cycle is:

Question # 15

The magnitude of alternative voltage V:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
3 The r.m.s. value of alternating current is equal to its maximum value at angle of
A. 60°
B. 45°
C. 30°
D. 90°
4 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these
5 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
6 OP-AMP has the following input terminals
A. one
B. two
C. three
D. four
7 In describing functions of digital systems, a closed switch will be shown as
A. 0
B. 1
C. low
D. any one of these
8 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
9 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)
10 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts

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