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

Question # 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

Question # 3

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

Question # 4

Mathematical manipulation of the two quantized states can be best carried if they are represented by

Question # 5

Alternating current can induce voltage because it has a

Question # 6

The closed loop gain of the inverting amplifier is written as

Question # 7

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

Question # 8

In n-p-n transistor, emitter base junction is kept

Question # 9

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

Question # 10

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

Question # 11

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

Question # 12

SI unit of impedance is

Question # 13

In a transistor, the central region is called

Question # 14

The entire wave form of sinusoidal voltage is actually a set of all the:

Question # 15

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
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 Alternating current can be transmitted:
A. To long distance
B. At very high cost
C. At very low cost
D. Both (A) and (C)
4 When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency
A. 9.4 kHz
B. 940 kHz
C. 94 kHz
D. None of these
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
A. 2nd group
B. fourth group
C. fifth group
D. sixth group
6 Peak value of alternative current is:
A. one of its Instantaneous value
B. Equal to its RMS value
C. The same as its peak-to-peak value
D. Both (B) and (C)
7 The basic circuit elements of A.C circuit are
A. Resistor
B. Inductor
C. Capacitor
D. All the three
8 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
9 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
10 A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at
A. inverting input
B. non-inverting input
C. any one of the input terminal
D. none of them

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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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