Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: In a transistor the base is made thin. Reason: A thin base makes the transistor stable.A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true but reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
Correct Answer: C
Solution :
In a transistor the base is lightly doped and very thin. This feature is main concept of transistor action on account of which only few holes (less than 5%) combine with the electrons in base region. Thickness of base region is so small that most of electrons diffusing through base region cross over through collector region. By reducing the base width the power of transistor increase but it does not mean that transistor becomes stable.
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