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 emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 2

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

Question # 3

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

Question # 4

Which of the following has a great concentration of impurity

Question # 5

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

Question # 6

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

Question # 7

OP-AMP has the following input terminals

Question # 8

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 9

A diode characteristic curve is a plot between

Question # 10

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

Question # 11

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 12

For normal operation of transistor, the batteries

Question # 13

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

Question # 14

Which one of the following is correct?

Question # 15

The basic circuit elements of A.C circuit are

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
3 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
4 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
5 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
6 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
7 If 250V is the RMS value of alternative voltage, then its peak value Vowill be:
A. 353.5V
B. 250V
C. 175V
D. zero
8 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
9 A diode characteristic curve is a plot between
A. current and time
B. voltage and time
C. voltage and current
D. forward voltage and reversed voltage
10 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector

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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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