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

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 # 2

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

Question # 3

The magnitude of alternative voltage V:

Question # 4

Chock consumes externally small

Question # 5

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

Question # 6

The r.m.s. value of alternating current is equal to its maximum value at angle of

Question # 7

Average value of A.C voltage during one cycle is

Question # 8

A digital system deals with quantities or variables which have

Question # 9

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

Question # 10

The sum of positive and negative peak values is called:

Question # 11

For normal operation of transistor, the batteries

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

The wave form of alternating voltage is the graph between:

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ECAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 The time interval during which the Voltage source changes its polarity once is known as:
A. Time period T
B. Half the time period
C. Quarter the time period
D. Two third of the time period
2 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
3 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
4 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
5 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
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 When either L or C is increased, the resonant frequency of the RLC series circuit
A. Increases
B. Decreases
C. Remains the same
D. Becomes zero
8 A P-N juction or semiconductor diode cannot be used as
A. A rectifier
B. Detector
C. Oscillator
D. An amplifier
9 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
10 The phase at the positive peak of an A.C. cycle is:
A. 0º

B. 90º

C. 180º

D. 0 andᏘ

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