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

Question # 2

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

Question # 3

At resonance, the phase angle for RLC series resonance circuit equals

Question # 4

During the positive half-cycle in the half-wave rectification,the diode

Question # 5

Which of the following has a great concentration of impurity

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

Alternating current is produced by a voltage source which polarity:

Question # 11

The magnitude of alternative voltage V:

Question # 12

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

Question # 13

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 # 14

The R1= infinity and R2= 0, then the gain of non-inverting amplifier is

Question # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
2 Alternating current is produced by a voltage source which polarity:
A. Remains the same
B. Reverse after period T
C. Keeps on reversing with time
D. Reverse after every time interval T/2
3 The value of the input resistance of OP-AMP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several maga ohms
4 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
5 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
6 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
7 Which one of the following waves belongs to electromagnetic spectrum
A. Radio and TV waves
B. Radar waves
C. Micro waves
D. All of them
8 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
9 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
10 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

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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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