Table of Content  
4.1 Thermionic Emission and Cathode Ray
4.2 Carthode Ray Oscilloscope
4.3 Semiconductor
4.4 Semiconductor Diode
4.5 Trasistor
4.6 Logic Gate

Semiconductor Diode

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1)The formation of depletion layer is due to ___________.

Choice 1
Doping
Choice 2
Recombination
Choice 3
Barrier potential
Choice 4 Ions


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2)Which of the following is true about a forward biased semiconductor diode?

Choice 1
It is made up of a p-type semiconductor.
Choice 2
A large current can flow through the diode.
Choice 3
The positive terminal of the electrical source is connected to the n-type semiconductor of the diode.
Choice 4 The holes from the n-type semiconductor flow across the pn junction.



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3) Diagram above shows 2 circuits which contain a dry cell, a diode and a bulb respectively. Which of the following is true about the bulb in the X circuit and the the Y circuit?


Circuit X

Circuit Y

Choice 1 Light up Does not light up
Choice 2
Does not light up Light up
Choice 3
Light up Light up
Choice 4 Does not light up Light up


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4) Diagram above shows two identical bulb, X and Y connected to a battery, a switch and a diode in a circuit. When the switch is open (off), both of the bulbs light up with same brigthness. What will happen to the bulbs if the switch is closed (on)?

Choice 1
X and Y show same brigthness
Choice 2
X brighter than Y
Choice 3
Y brighter than X
Choice 4 Both of the bulp do not ligth up.


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The condition of the bulb

Electronic component

Before the cell is inverted

After the cell is inverted

A

Lights up

Does not light up

B

Lights up

Lights up

5) Diagram above shows a circuit with an open terminal X and Y. Two electrical component, A and B are connected to X and Y, one after another. The experiment is repeated by inverting the terminal of the cells. Table above shows the result of the experiment. The electronic componet J and K are



A B
Choice 1 Diode Resistor
Choice 2
Diode Capasitor
Choice 3
Resistor Diode
Choice 4 Resistor Capasitor


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6) In the diagram above. Which bulb/bulbs will lights up when the switch of closed?

Choice 1
P
Choice 2
Q
Choice 3
R
Choice 4 P and R


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7) Three identical resistor, R1, R2 and R3 are connected to a bridge rectifier as shown in the diagram above. Which of the resistor will only have direct current flows in it?

Choice 1
R1
Choice 2
R2
Choice 3
R3
Choice 4 All R1, R2 and R3


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8) The diagram above shows 4 diodes are connected to a resistor. The voltage across the resistor is measured by a cathode ray oscilloscope. Which of the following wave form will be displaced on the screen of the CRO?

Choice 1
Choice 2
Choice 3
Choice 4


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9) A bulb, a capasitor and a diode are connected to an alternating current as shown in the figure above. The voltage across the bulb is measured by a cathode ray oscilloscope. Which of the following waveform below shows the voltage across the bulb?

Choice 1
Choice 2
Choice 3
Choice 4


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electromagnetism notes