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

In a transistor, the central region is called

Question # 2

The total reactance of a series RLC circuit at resonance is

Question # 3

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 # 4

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

Question # 5

At resonance frequency the impedance of parallel resonance circuit is

Question # 6

A digital system deals with quantities or variables which have

Question # 7

Which of the following diodes can operate in the reverse biased condition

Question # 8

The RMS value of alternating current is:

Question # 9

The Instantaneous value of alternative current maybe:

Question # 10

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

Question # 11

The amplifier which us used to perform mathematical operations electronically is known as

Question # 12

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

Question # 13

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

Question # 14

In half wave rectification

Question # 15

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 In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
A. photo diode
B. light emitting diode
C. photo voltaic cell
D. all of them
2 The sum of positive and negative peak values is called:
A. Instantaneous value
B. Peak value
C. Rms valuie
D. Peak-to peak-value
3 The input resistance of the OP-AMP is the resistance between the
A. (-) input and output
B. (+) input and output
C. (-) and (+) inputs
D. between any inputs
4 The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its
A. Icwill decrease
B. VCEwill increase
C. ICwill increase
D. VCCwill increase
5 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)
6 If we connect a A.C. volt meter to read A.C. voltage, It would read its:
A. RMS value
B. Instantaneous value
C. Valued average over a cycle
D. Zero
7 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
8 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
9 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
10 In half wave rectification
A. both halves of the input voltage is used
B. only one half of the input voltage is used
C. either of these
D. none of these

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