Question

The lubricants that are suitable for internal combustion engines must have ______ viscosity index.

(a) high

(b) low

(c) no

(d) minimum

I have been asked this question by my school principal while I was bunking the class.

I want to ask this question from Selection of Lubricants in portion Lubricants of Applied Chemistry

Answer 1

Correct answer is (a) high

For explanation I would say: The lubricant that is used in internal combustion engines must have the high viscosity index because it is exposed very high temperatures that are produced by the engines.