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

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.

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

	Doping
	Recombination
	Barrier potential
	Ions

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

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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?

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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)?

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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

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

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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?

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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?

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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?