Discussion
Statement I: A Zener diode's temperature coefficient is negative below about five volts.
Statement II: It is also negative above about five volts.
In the light of the above statements, choose the correct answer.
Answer: C
The first is true and the second is false: above five volts avalanche multiplication dominates and the coefficient turns positive, which is exactly why a device near 5.6 V, where the two mechanisms overlap, drifts hardly at all. The crossover is the whole reason that particular voltage appears so often in reference circuits, and it is a good example of a design value chosen because two effects cancel there. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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