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

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 2

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

Question # 3

The alternative voltage of current is actually measured by:

Question # 4

Alternating current can be transmitted:

Question # 5

Conversion of alternating current into direct current is called

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

SI unit of impedance is

Question # 10

Which of the following has a great concentration of impurity

Question # 11

In free space, the speed of electromagnetic waves is

Question # 12

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

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 frequency modulation (FM), the carrier waves amplitude

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 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
2 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
3 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
4 For normal operation of transistor, the batteries
A. VCCis of much lower value than VBB
B. VCCis of much higher value than VBB
C. VCC is equal toVBB
D. none of these
5 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
6 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
7 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
8 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
9 In which of the following components, pn-junction is used
A. light emitting diode
B. photo diode
C. photo voltaic cell
D. all of these
10 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase

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