ECAT Pre Engineering Physics Chapter 16 MCQ Test With Answer

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

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Physics ECAT Pre Engineering Chapter 16 Alternating Current

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Question # 1

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

Question # 2

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

Question # 3

In a transistor, if the central region is p-type then this type of transistor is known as

Question # 4

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

Question # 5

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

Question # 6

The highest value reached by the voltage or current:

Question # 7

If 250V is the RMS value of alternative voltage, then its peak value Vowill be:

Question # 8

The impedance of RLC series resonance circuit at resonant frequency is

Question # 9

During each cycle, alternating voltage reaches a peak value

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The most common source of alternating voltage is:

Question # 15

In a transistor, if the central region is n-type, then this type of transistor is known as

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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 In frequency modulation (FM), the carrier waves amplitude
A. Remains constant
B. Increase
C. Decreases
D. None of these
3 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
4 The device which allows only the flow of an A.C. through a circuit is
A. Capacitor
B. Inductor
C. D.C. motor
D. Battery
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 Nowadays, Most of the electric energy is produced by the A.C. generators using:
A. Hydal water
B. Geothermal energy
C. Solar energy
D. Biomass
7 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
8 The length of rotating vector (on a certain scale) represents the:
A. Peak value of alternating quantity
B. RMS value of alternating quantity
C. Instantaneous value of alternating quantity
D. Either (B) or (C)
9 A resonance curve for RLC series circuit is a plot of frequency versus
A. Voltage
B. Current
C. Impedance
D. Reactance
10 Conversion of alternating current into direct current is called
A. amplification
B. rectification
C. conduction
D. polarization

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