Question

Of the two lubricants A and B for a machine, A has co-efficient of viscocity slightly greater than that of B. Which would you prefer in summer and winter?

• A. B in summer as well as winter
• B. B in summer and A in winter
• C. A in summer and B in winter
• D. A in summer as well as winter

Answer 1

The correct option is C

A in summer and B in winter

In summers, co-efficient of viscocity of liquid decreases with rise in temperature and in winters, co-efficient of viscocity of liquid increases with fall in temperature. Hence sample A having greater co-efficient of viscocity is preferred in summers and sample B in winters.