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

The impedance of RLC series resonance circuit at resonant frequency is

Question # 2

When the emitter-base junction of a transistor is reverse biased, collector current

Question # 3

Alternating current is produced by a voltage source which polarity:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

Peak value of alternative current is:

Question # 9

Which of the following has a great concentration of impurity

Question # 10

Transmitting antenna emits

Question # 11

A digital system deals with quantities or variables which have

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The basic circuit elements of A.C circuit are

Question # 16

When the pn-junction is connected reversed biased, its resistance is of the order of

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

The value of the input resistance of OP-AMP is of the order of

Question # 21

The highest value reached by the voltage or current:

Question # 22

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

Question # 23

The phase at the positive peak of an A.C. cycle is:

Question # 24

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

Question # 25

The bridge circuit of full wave rectification uses

Question # 26

Most OP-AMP operates with

Question # 27

When the pn-junction is in reversed biased, current flows through the junction due to the

Question # 28

SI unit of impedance is

Question # 29

The total reactance of a series RLC circuit at resonance is

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 In a normally biased n-p-n transistor, an electron c current IEflows from the
A. emitter into the base
B. collector into the base
C. base into collector
D. none of these
2 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
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 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 Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length
A. X-rays
B. Ultraviolet rays
C. y-rays
D. Cosmic rays
6 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
7 In RLC series circuit, resonance occurs when
A. XL > Xc
B. XL < Xc
C. XL = Xc
D. None of these
8 At resonance frequency the impedance of parallel resonance circuit is
A. Maximum
B. Minimum
C. Zero
D. None of the above
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 At resonance, the phase angle for RLC series resonance circuit equals
A. 0°
B. 90°
C. 180°
D. 270°

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