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

The amplifier which us used to perform mathematical operations electronically is known as

Question # 2

The wave form of alternating voltage is the graph between:

Question # 3

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

Question # 4

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 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

Question # 6

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

Question # 7

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

Question # 8

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 9

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

Question # 10

Chock consumes externally small

Question # 11

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 12

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

Question # 13

The device which allows only the flow of an A.C. through a circuit is

Question # 14

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

Question # 15

In free space, the speed of electromagnetic waves is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
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 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. none of these
4 A changing magnetic flux creates around itself
A. An electromotive force
B. An electric field (changing electric flux)
C. Magnetic field
D. None of the above
5 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°
6 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
7 The RMS value of alternating current is:
A. 0.7 times at the peak value
B. 0.5 times the peak value
C. 0.7 times the Instantaneous value
D. Equal to maximum voltage
8 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
9 In series RC circuit when R=Xc, then the phase angle is
A. 0°
B. 90°
C. 70°
D. 45°
10 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

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