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

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 2

The phase at the positive peak of an A.C. cycle is:

Question # 3

Average value of A.C voltage during one cycle is

Question # 4

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

Question # 5

For a n-p-n transistor, the conventional current equation can be written as

Question # 6

At resonance frequency the impedance of parallel resonance circuit is

Question # 7

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

Question # 8

In series RC circuit when R=Xc, then the phase angle is

Question # 9

Which one of the following waves belongs to electromagnetic spectrum

Question # 10

The closed loop gain of the non-inverting amplifier is given by

Question # 11

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

Question # 12

The value of the input resistance of OP-AMP is of the order of

Question # 13

The output voltage of half wave rectification is in the form of

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
2 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
3 When the emitter-base junction of a transistor is reverse biased, collector current
A. Reverses
B. Increases
C. Decreases
D. Stops
4 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
5 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
6 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
7 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
8 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
9 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
10 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms

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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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