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 has a great concentration of impurity

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The value of current gain of n-p-n transistor is of the order of

Question # 7

Electromagnetic waves transmit energy equal to

Question # 8

When either L or C is increased, the resonant frequency of the RLC series circuit

Question # 9

Most OP-AMP operates with

Question # 10

In a transistor, the central region is called

Question # 11

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

Question # 12

For the normal operation of the transistor, its

Question # 13

Nowadays, Most of the electric energy is produced by the A.C. generators using:

Question # 14

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

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 In a transistor, if the central region is n-type, then this type of transistor is known as
A. n-p-n transistor
B. p-n-p transistor
C. either of these
D. none of these
2 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
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 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
5 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
6 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
7 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
8 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
9 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
10 A digital system deals with quantities or variables which have
A. only one state
B. only two discrete states
C. three discrete states
D. four discrete states

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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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