ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 2

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

Question # 3

A changing magnetic flux creates around itself

Question # 4

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

Question # 5

Average value of A.C voltage during one cycle is

Question # 6

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 7

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

Question # 8

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

Question # 9

In describing functions of digital systems, a closed switch will be shown as

Question # 10

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

Question # 11

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

Question # 12

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 # 13

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 14

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
2 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
3 At higher frequency of the alternating current, the capacitive reactance Xc
A. Increases
B. Decreases
C. Remains the same
D. Increases only when the voltage increases
4 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
5 The phase angle of a series RLC circuit at resonance is
A. 180°
B. 90°
C. 0°
D. None of the these
6 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
7 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
8 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
A. base and emitter
B. collector and emitter
C. base and collector
D. any one of these
9 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
10 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

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  • Iiqra Fatima

    Iiqra Fatima

    25 May 2018

    You should let us practice difficult mcqs ..These are too easy for ECAT level....Thanku

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