ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 16 Alternating Current

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ECAT Pre General Science Physics Chapter 16 Alternating Current

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Question # 1

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

Question # 2

The closed loop gain of the inverting amplifier is written as

Question # 3

Peak value of alternative current is:

Question # 4

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

Question # 5

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

Question # 6

Which one of the following is correct?

Question # 7

In which of the following components, pn-junction is used

Question # 8

The power factor of resonant series circuit is

Question # 9

At resonance, the impedance of RLC series circuit is

Question # 10

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

Question # 11

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

Question # 12

Transmitting antenna emits

Question # 13

In a normally biased n-p-n transistor, an electron c current IEflows from the

Question # 14

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

Question # 15

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

Question # 16

The basic circuit elements of A.C circuit are

Question # 17

Which of the following diodes can operate in the reverse biased condition

Question # 18

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

Question # 19

The magnitude of alternative voltage V:

Question # 20

A diode characteristic curve is a plot between

Question # 21

The most common source of alternating voltage is:

Question # 22

The open loop gain of OP-AMP is of the order of

Question # 23

For the normal operation of the transistor, its

Question # 24

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

Question # 25

Chock consumes externally small

Question # 26

For normal operation of transistor, the batteries

Question # 27

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

Question # 28

Average value of A.C voltage during one cycle is

Question # 29

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

Question # 30

Electromagnetic waves transmit energy equal to

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The circuit which is used to smooth the output voltage of the full-wave rectification is known as
A. transformer
B. rectifier
C. filter
D. none of these
2 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
3 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization
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 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
6 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these
7 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
8 Alternating current can induce voltage because it has a
A. High peak value
B. Varying magnetic field
C. Stronger field than direct curren
D. Constant magnetic field
9 The entire wave form of sinusoidal voltage is actually a set of all the:
A. Positive maximum value + Voand negative maximum value -Vo
B. Posiotive maximum value +Vo and zero
C. Zero and negative maximum value -Vo
D. Any of these
10 If we connected the ordinary DC ammeter to measure alternating current, it would measure its:
A. Instantaneous value
B. RMS value
C. Value averaged over a cycle
D. Either (B) or (C)

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