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#meniscus

2 public questions tagged with this topic.

Fluid Pressure, Pascal's Law and Manometers

A capillary tube of radius 0.3mm is dipped in water (S\=0.0727N/m, ρ\=1000kg/m3, cos⁡θ\=1). What is the capillary rise?

h = 2Scos⁡θρga. S = 0.0727N/m, ρ = 1000kg/m3, g = 10m/s2, a = 0.3×10−3m. h = 2×0.0727×11000×10×0.3×10−3 = 0.04847m = 4.85cm. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 4.8 cm. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.

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Equation of Continuity and Flow Rate

What causes a liquid to form a concave meniscus in a glass tube?

A concave meniscus forms when adhesive forces between the liquid (e.g., water) and glass exceed cohesive forces within the liquid, pulling the edges upward and creating a curved surface. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Strong adhesive forces. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.

Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.

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