Physics Fluid Mechanics Velocity,Terminal Velocity and Coeficient of Viscocity,Viscocity of Fluids MCQ (Single Correct)

More viscous oil is used in summer than in winter in motors due to:

A
Rise in temperature in summer the viscosity of oil increases
B
Rise in temperature in summer the viscosity of oil decreases
C
Surface tension of oil decreases
D
Surface tension of oil increases

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The correct answer is:
B

Due to increase in temperature, viscosity of oil decreases, surface tension also decreases but

surface tension doesn't consider for lubrication property of oil/liquid.

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