Mechanical Properties of Fluids — Practice Quiz
Maharashtra Board · Class 12 · Physics
Try a 4-question quiz on Mechanical Properties of Fluids for Maharashtra Board Class 12 Physics: tap an answer to check it and see why.
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Quick Quiz: Mechanical Properties of Fluids
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What is the SI unit of pressure?
A swimming pool has a depth of 3 m. What is the gauge pressure at the bottom of the pool? (Take density of water = 1000 kg/m³, g = 10 m/s²)
According to Pascal's law, pressure applied to an enclosed fluid is:
The surface tension of water is 0.072 N/m. Calculate the force required to pull apart a wire ring of diameter 10 cm from water surface.
Sample Questions
Which of the following properties are characteristic of an ideal fluid? (Select all correct answers)
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Incompressible, Non-viscous, Irrotational flow, Steady flow
An ideal fluid has four main properties: (1) Incompressible - constant density, (2) Non-viscous - no internal friction, (3) Irrotational flow - smooth flow without turbulence, and (4) Steady flow - velocity at each point constant in time. Surface tension is not a defining property of ideal fluids.
Which factors affect the angle of contact between a liquid and solid surface? (Select all correct answers)
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Nature of liquid and solid, Temperature, Impurities in liquid
Angle of contact depends on: (1) Nature of liquid and solid in contact, (2) Temperature of liquid - higher temperature generally decreases angle of contact, and (3) Impurities present in liquid - can change the angle significantly. Volume of liquid and atmospheric pressure don't affect the angle of contact.
A capillary tube of radius 1 mm is dipped in water. If the height of water rise is 3 cm, what is the surface tension of water? (Take angle of contact = 0°, ρ = 1000 kg/m³, g = 10 m/s²)
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0.075 N/m
Using capillary rise formula: h = 2T cosθ/(rρg). Given: h = 0.03 m, r = 0.001 m, θ = 0° (cosθ = 1), ρ = 1000 kg/m³, g = 10 m/s². Rearranging: T = hrρg/(2cosθ) = 0.03 × 0.001 × 1000 × 10/(2 × 1) = 0.075 N/m.
Viscosity is the property of fluids that represents:
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Internal friction between fluid layers
Viscosity is the property of fluid by virtue of which relative motion between different layers of a fluid experience a dragging force. This dragging force is due to internal friction between the layers.
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