NCERT · Class 11 · Physics · Mechanical Properties of FluidsThe angle of contact for mercury with clean glass is:
Step-by-Step Solution
Mercury does not wet glass because cohesive forces inside mercury are stronger than adhesive forces between mercury and glass. Its angle of contact is obtuse, approximately $138^\circ$ or $140^\circ$.
Detailed Options Breakdown
Option : Acute ($< 90^\circ$)
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Mechanical Properties of Fluids.
Option 1: Right angle ($90^\circ$)
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Mechanical Properties of Fluids.
Option 2: Obtuse ($> 90^\circ$) (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Zero ($0^\circ$)
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Mechanical Properties of Fluids.
💡 Study Guide: This question tests core syllabus concepts from Mechanical Properties of Fluids. For formulas, key summaries, and mock exam reference guides, read the full Mechanical Properties of Fluids Revision Notes.