Question

With increase in temperature, viscosity of lubricating oil

• A. increases
• B. decreases
• C. remains constant
• D. first increases and then decreases

Answer 1

The correct option is B

decreases

With high temperatures, viscosity decreases in liquids. Due to rise in temperature, kinetic energy of molecules increases, hence, randomness and collision of molecules increases. The increase in the temperature reduces the cohesive forces between the molecules of liquid and hence, the viscosity decreases.