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

Transmitting antenna emits

Question # 2

In frequency modulation (FM), the carrier waves amplitude

Question # 3

SI unit of impedance is

Question # 4

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

Question # 5

Which one of the following waves belongs to electromagnetic spectrum

Question # 6

During the positive half-cycle in the half-wave rectification,the diode

Question # 7

In free space, the speed of electromagnetic waves is

Question # 8

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

Question # 9

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

Question # 10

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 11

In a transistor, the central region is called

Question # 12

The magnitude of alternative voltage V:

Question # 13

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

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Transmitting antenna emits
A. Magnetic waves
B. Electric waves
C. Electromagnetic waves
D. Sound waves
2 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°
3 The highest value reached by the voltage or current:
A. In quarter cycle is called Instantaneous value
B. In half cycle is called peak-to-peak value
C. In one cycle is called peak value
D. In half cycle is called Instantaneous value
4 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
5 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
6 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
7 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
8 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)
9 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
10 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these

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