a) V.I.=\(\frac{L-U}{L-H}\)*100
b) V.I.=(L-U)+(L+H)
c) V.I.=(L-U)*(L+H)
d) V.I.=\(\frac{L-H}{L-U}\)*100
Answer: a
Explanation: Viscosity index is an arbitrary measure for the change of viscosity with variations in temperature. The lower the VI, the greater the change of viscosity of the oil with temperature and vice versa. It is used to characterize viscosity changes with relation to temperature in lubricating oil.
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