(a) P-type and n-type semiconductors are made from a pure semiconductor by a process called ‘doping’ (i) What is meant by doping? (1 Mark) (ii) Explain how doping produces n-type semiconductor. (4 Marks) (b) State two principle uses of light-emitting diode (LED) (2 Marks) (c) Define the following terms related to transistor currents. (i) Alpha factor (1 Mark) (ii) Beta factor (1 Mark) (d) A transistor has a collector current of 10mA and base current of 40mA. What is the current gain of the transistor. (2 Marks) (e) State two major drawbacks of Bipolar Junction Transistor (BJT). (2 Marks) (f) A transistor has a collector current of 2mA. If the current gain is 135, what is the base current? (2 Marks) (g) Give any three differences between Bipolar Junction Transistors (BJT) and Junction Field Effect Transistors (JFET). (6 Marks)
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