Indian Navy Pilot Mechanical Properties of Solids and Fluids — practice questions

Explore 4 free Mechanical Properties of Solids and Fluids questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Mechanical Properties of Solids and Fluids questions and exercises with answers

Showing questions 1–4 of 4.

Stokes' law: viscous drag on sphere of radius r moving at v through fluid of viscosity η:Read the answer and worked solution →Excess pressure inside soap bubble of radius 2 cm (γ = 0.025 N/m):Read the answer and worked solution →Match each property of matterRead the answer and worked solution →Solids topic or fluids topic?Read the answer and worked solution →

Worked practice questions

Stokes' law: viscous drag on sphere of radius r moving at v through fluid of viscosity η:

F = 4π η r
F = η r²
F = 6π η r v
F = π v

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Correct answer: C. F = 6π η r v

F_drag = 6π η r v. Valid for laminar (low Reynolds number). Used to derive terminal velocity of falling sphere also Millikan's oil-drop experiment.

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Excess pressure inside soap bubble of radius 2 cm (γ = 0.025 N/m):

2.5 Pa
1.25 Pa
10 Pa
5 Pa (= 4γ/r = 4 × 0.025/0.02)

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Correct answer: D. 5 Pa (= 4γ/r = 4 × 0.025/0.02)

Soap bubble has 2 surfaces (inner + outer): ΔP = 4γ/r = 4 × 0.025 / 0.02 = 5 Pa.

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Match each property of matter

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Matching pairs

Left
Stress
Right
Restoring force acting per unit area
Left
Strain
Right
The fractional change in the dimension
Left
Elasticity
Right
Regaining shape once the force is removed
Left
Pascal's law
Right
Pressure applied is passed on undiminished

Instructions

Tap a term on the left, then tap what it means.

_Source: syllabus Physics Ch8 Mechanical Properties of Solids, 8.2 Stress and strain_

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