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 closed loop gain of the inverting amplifier is written as

Question # 2

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

Question # 3

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

Question # 4

A digital system deals with quantities or variables which have

Question # 5

The RMS value of alternating current is:

Question # 6

Which of the following has a great concentration of impurity

Question # 7

In free space, the speed of electromagnetic waves is

Question # 8

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 9

The power factor of resonant series circuit is

Question # 10

The average of A.C. current and voltage over a complete cycle is

Question # 11

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

Question # 12

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 # 13

A changing magnetic flux creates around itself

Question # 14

The magnitude of alternative voltage V:

Question # 15

Alternating current can be transmitted:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero
2 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
3 An A.C varies as a function of
A. Current
B. Voltage
C. Time
D. Charge
4 The basic circuit element in D.C. circuit is:
A. A capacitor
B. A resistor
C. An inductor
D. Both (A) and (C)
5 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
6 The value of current gain of n-p-n transistor is of the order of
A. tens
B. hundreds
C. thousands
D. ten thousands
7 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
8 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector
9 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
10 Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is
A. zero
B. small
C. large
D. very large

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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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