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

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

Question # 2

Average value of A.C voltage during one cycle is

Question # 3

An A.C varies as a function of

Question # 4

At higher frequency of the alternating current, the capacitive reactance Xc

Question # 5

The open loop gain of OP-AMP is of the order of

Question # 6

Electromagnetic waves transmit energy equal to

Question # 7

The basic circuit elements of A.C circuit are

Question # 8

The phase angle of a series RLC circuit at resonance is

Question # 9

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 10

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

Question # 11

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

Question # 12

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 # 13

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

Question # 14

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

Question # 15

The time interval during which the Voltage source changes its polarity once is known as:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
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
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
2 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
3 When the pn-junction is connected reversed biased, its resistance is of the order of
A. few ohms
B. few kilo-ohms
C. few mega-ohms
D. few mili-ohms
4 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
5 The power factor of resonant series circuit is
A. 1
B. 0
C. -1
D. 0.5
6 The output voltage of half wave rectification is in the form of
A. a smooth curve
B. a smooth wave
C. pulses
D. all of the above
7 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
8 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
9 The closed loop gain of the non-inverting amplifier is given by
A. G = R2/R1
B. G = -R2/R1
C. G = 1 - R2/R1
D. G = 1 + T2/R1
10 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery

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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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