Discussion
Assertion: a high viscosity index is desirable in an engine oil. Reason: the oil must be thin enough to circulate when cold and thick enough to carry load when hot.
Answer: B
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason states the requirement precisely. The engine must be started cold, when a thick oil would not reach the bearings, and must be protected hot, when a thin one would not carry load. Only an oil whose viscosity changes little between the two conditions can do both, which is exactly what a high viscosity index means.
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