ECAT Pre Computer Science Chapter 16 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 16 Alternating Current

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

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ECAT Physics Chapter 16 Alternating Current

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Question # 1

The bridge circuit of full wave rectification uses

Question # 2

Conversion of alternating current into direct current is called

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

SI unit of impedance is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The time interval during which the Voltage source changes its polarity once is known as:

Question # 12

The Instantaneous value of alternative current maybe:

Question # 13

The total reactance of a series RLC circuit at resonance is

Question # 14

Alternating current can induce voltage because it has a

Question # 15

In free space, the speed of electromagnetic waves is

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 When the pn-junction is in reversed biased, current flows through the junction due to the
A. majority carriers
B. minority carriers
C. either of them
D. none of them
2 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
3 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
4 The average of A.C. current and voltage over a complete cycle is
A. Maximum
B. zero
C. Neither zero nor maximum
D. None of these
5 The magnitude of alternative voltage V:
A. Always increase
B. Always decrease
C. Remains constant
D. Does not remain constant
6 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ
7 Which of the following has a great concentration of impurity
A. base
B. emitter
C. collector
D. none of these
8 In a transistor, if the central region is p-type then this type of transistor is known as
A. p-n-p transistor
B. n-p-n transistor
C. either of these
D. none of these
9 For the normal operation of the transistor, its
A. emitter-base and collector base junctions are forward biased
B. emitter-base junction is reversed biased and collector base junction is forward biased
C. emitter-base junction is forward biased and collector-base junction is reverse biased
D. any one of these
10 The Instantaneous value of alternative current maybe:
A. The same as its RMS value
B. Greater than its Rms value
C. The same as its peak value
D. Any of these

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