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

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

Question # 2

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

Question # 3

The alternative voltage of current is actually measured by:

Question # 4

The waveform of alternating voltage is a:

Question # 5

The impedance of RLC series resonance circuit at resonant frequency is

Question # 6

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

Question # 7

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

Question # 8

During each cycle, alternating voltage reaches a peak value

Question # 9

The wave form of alternating voltage is the graph between:

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

Which of the following diode is used for the detection of light

Question # 15

The magnitude of alternative voltage V:

Question # 16

Most OP-AMP operates with

Question # 17

Electromagnetic waves transmit energy equal to

Question # 18

The most common source of alternating voltage is:

Question # 19

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

Question # 20

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

Question # 21

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

In frequency modulation (FM), the carrier waves amplitude

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 When the pn-junction is forward biased. the current flows through it is of the order of
A. mili-amperes
B. amperes
C. nano-amperes
D. micro-amperes
3 During each cycle, alternating voltage reaches a peak value
A. One time
B. Two times
C. Four times
D. A number of times depending on the frequency
4 At resonance, the impedance of RLC series circuit is
A. Maximum
B. Zero
C. Minimum
D. Determinate
5 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
6 During the negative half-cycle of the half-wave rectification, the diode
A. does not conduct
B. conducts
C. either of these
D. none of these
7 Electromagnetic waves transmit energy equal to
A. 1/2 mv2
B. moc2
C. hf/c
D. hf
8 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
9 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
10 A sinusoidally alternating voltage or current can be graphically represented by a:
A. Vector
B. Rotating vector
C. Clockwise vector
D. Anticlockwise voltage vector

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