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

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

Question # 2

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

Question # 3

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

Question # 4

A digital system deals with quantities or variables which have

Question # 5

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 # 6

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

Question # 7

A resonance curve for RLC series circuit is a plot of frequency versus

Question # 8

The waveform of alternating voltage is a:

Question # 9

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

Question # 10

The alternative voltage of current is actually measured by:

Question # 11

Which one of the following is correct?

Question # 12

In half wave rectification

Question # 13

When the pn-junction is forward biased. the current flows through it is of the order of

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

A P-N juction or semiconductor diode cannot be used as

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

A changing magnetic flux creates around itself

Question # 24

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

Question # 25

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

Question # 26

Which of the following has a great concentration of impurity

Question # 27

The output voltage of half wave rectification is in the form of

Question # 28

The highest value reached by the voltage or current:

Question # 29

The RMS value of alternating current is:

Question # 30

During the negative half-cycle of the half-wave rectification, the diode

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 Average value of A.C voltage during one cycle is
A. 1
B. Zero
C. Maximum
D. Variable
2 If the value of C in a series RLC circuit is increased, the resonant frequency
A. Is not affected
B. Increase
C. Remains the same
D. Decreases
3 The value of output resistance of OP-AMOP is of the order of
A. few ohms
B. few hundred ohms
C. several kilo ohms
D. several mega ohms
4 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
5 The impedance of RLC series resonance circuit at resonant frequency is
A. Greater than R
B. Equal to R
C. Less than R
D. None of these
6 To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance
A. 5.07 pF
B. 50 pF
C. 0.507 pF
D. 507 pF
7 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
8 In an A.C circuit with resistor only, the current and voltage have a phase angle of
A. 90°
B. 0°
C. 180°
D. none of these
9 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
10 An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
A. Decreases
B. Increases
C. Does not change
D. Momentarily goes to zero

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