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 value of the potential difference across the depletion region for the case of germanium is

Question # 2

The basic circuit element in D.C. circuit is:

Question # 3

In a transistor, the central region is called

Question # 4

If the value of C in a series RLC circuit is increased, the resonant frequency

Question # 5

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 # 6

A diode characteristic curve is a plot between

Question # 7

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 # 8

The input resistance of the OP-AMP is the resistance between the

Question # 9

Alternating current can be transmitted:

Question # 10

The value of output resistance of OP-AMOP is of the order of

Question # 11

In describing functions of digital systems, a closed switch will be shown as

Question # 12

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

Question # 13

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

Question # 14

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

Question # 15

The r.m.s. value of alternating current is equal to its maximum value at angle of

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 The open loop gain of OP-AMP is of the order of
A. 102
B. 103
C. 104
D. 105
3 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
4 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
5 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
6 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
7 The wave form of alternating voltage is the graph between:
A. Voltage across X-axis and time across y-axis
B. Current and time
C. Voltage along y-axis and time along x-axis
D. Voltage and current
8 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
9 The basic circuit element in A.C. circuits are:
A. Resistor and capacitor
B. Resistor and Inductor
C. Capacitor only
D. Both (B) and (C)
10 An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is
A. 3525.0 volts
B. 35.35 volts
C. 353.5 volts
D. 3.535 volts

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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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