ECAT Pre General Science Physics Chapter 16 MCQ Test With Answer

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

Try The 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

Peak value of alternative current is:

Question # 2

A sinusoidally alternating voltage or current can be graphically represented by a:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

In frequency modulation (FM), the carrier waves amplitude

Question # 7

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

Question # 8

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

Question # 9

In an A.C circuit with resistor only, the current and voltage have a phase angle of

Question # 10

The most common source of alternating voltage is:

Question # 11

The basic circuit element in A.C. circuits are:

Question # 12

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

Question # 13

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

Question # 14

The bridge circuit of full wave rectification uses

Question # 15

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

Question # 16

Alternating current can be transmitted:

Question # 17

At resonance frequency the impedance of parallel resonance circuit is

Question # 18

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

Question # 19

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

Question # 20

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

Question # 21

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

Question # 22

A digital system deals with quantities or variables which have

Question # 23

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

Question # 24

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

Question # 25

Which one of the following is correct?

Question # 26

The phase angle of a series RLC circuit at resonance is

Question # 27

In free space, the speed of electromagnetic waves is

Question # 28

The average of A.C. current and voltage over a complete cycle is

Question # 29

The waveform of alternating voltage is a:

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The alternative voltage of current is actually measured by:
A. Its RMS value
B. Square root of its mean square value
C. Instantaneous value
D. Peak value
2 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:
A. Peak value
B. RMS value
C. Instantaneous value
D. Peak-to-peak value
3 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
4 The closed loop gain of the inverting amplifier is written as
A. G = R2/R1
B. G = 1 + R2/R1
C. G = -R2/R1
D. G = 1 - R2/R1
5 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
6 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°
7 SI unit of impedance is
A. hertz
B. henry
C. ampere
D. ohms
8 Chock consumes externally small
A. Charge
B. Current
C. Power
D. Potential
9 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
10 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

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