Indian Navy SSR (Sailor) Mechanical Properties of Solids and Fluids — practice questions

Explore 2 free Mechanical Properties of Solids and Fluids questions in Indian Navy SSR (Sailor) 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

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Reynolds number R_e for tube flow:Read the answer and worked solution →For elastic potential energy in stretched wire: F × ΔL / 2. Also equals:Read the answer and worked solution →

Worked practice questions

Reynolds number R_e for tube flow:

ρgh/η
ρvd/η
vd
η/ρ

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Correct answer: B. ρvd/η

R_e = ρvd/η (dimensionless). R_e < 2000: laminar. R_e > 4000: turbulent. Critical R_e: regime depends on geometry. Used to determine flow regime.

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For elastic potential energy in stretched wire: F × ΔL / 2. Also equals:

Force × length
All same
F × ΔL
(1/2) × stress × strain × volume

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Correct answer: D. (1/2) × stress × strain × volume

PE = (1/2) F ΔL. **Per unit volume:** u = (1/2) σ ε = (1/2)(F/A)(ΔL/L). **Total:** u × (A × L) = (1/2) F ΔL. ✓