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

Conversion of alternating current into direct current is called

Question # 2

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

Question # 3

During each cycle, alternating voltage reaches a peak value

Question # 4

During the negative half-cycle of the half-wave rectification, the diode

Question # 5

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

Question # 6

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

Question # 7

The phase angle of a series RLC circuit at resonance is

Question # 8

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

Question # 9

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 10

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 11

Which of the following diode is used for the detection of light

Question # 12

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

Question # 13

Most OP-AMP operates with

Question # 14

The input resistance of the OP-AMP is the resistance between the

Question # 15

Which of the following has a great concentration of impurity

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
2 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
3 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
4 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
5 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
6 The most common source of alternating voltage is:
A. Motor
B. Transformer
C. AC genrator
D. Both (A) and (C)
7 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
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 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
10 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)

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