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

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

Question # 3

The RMS value of alternating current is:

Question # 4

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 5

A signal is amplified at the output without any change of phase, if it is applied at the

Question # 6

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

Question # 7

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

Question # 8

Chock consumes externally small

Question # 9

SI unit of impedance is

Question # 10

A diode characteristic curve is a plot between

Question # 11

For the normal operation of the transistor, its

Question # 12

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 # 13

The length of rotating vector (on a certain scale) represents the:

Question # 14

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

Question # 15

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
3 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
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 A signal is amplified at the output without any change of phase, if it is applied at the
A. inverting input
B. non-inverting input
C. at any of the input
D. none of these
6 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
7 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
8 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
9 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
10 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period

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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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