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

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

Question # 2

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

Question # 3

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

Question # 4

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

Question # 5

For the normal operation of the transistor, its

Question # 6

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

Question # 7

OP-AMP has the following input terminals

Question # 8

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

Question # 9

The most common source of alternating voltage is:

Question # 10

The sum of positive and negative peak values is called:

Question # 11

SI unit of impedance is

Question # 12

Which one of the following is correct?

Question # 13

For normal operation of transistor, the batteries

Question # 14

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 # 15

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
2 In n-p-n transistor, emitter base junction is kept
A. reversed
B. forward biased
C. may be reversed or may be forward biased
D. none of these
3 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
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 Most OP-AMP operates with
A. + 6 V supply
B. + 10 V supply
C. + 12 V supply
D. + 24 V supply
6 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
7 When the p-n junction is forward biased its resistance is of the order of
A. few mega ohms
B. few kilo ohms
C. few ohms
D. few milli ohms
8 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
9 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
10 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
A. 2nd group
B. fourth group
C. fifth group
D. sixth group

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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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