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Question 30973
JEE Physics · Hard

Fluid Mechanics: Viscosity MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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ViscosityHardQuestion 30973

Question

Effect of temperature on viscosity: In engine oil, viscosity decreases sharply on heating. This means oil:
  1. A
    Flows less readily when hot
  2. B
    Flows more readily when hot
    Correct
  3. C
    Provides more lubrication when hot
  4. D
    Increases friction when hot

Correct answer

Flows more readily when hot

Explanation

Lower viscosity = less resistance to flow = oil flows more easily. Hot oil is thinner, which is why engine oil viscosity ratings (e.g., 5W-30) specify behaviour at different temperatures.

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