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

Explore 4 free Mechanical Properties of Solids and Fluids questions in Indian Navy INET 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.

Pascal's law states pressure applied to enclosed fluid is:Read the answer and worked solution →Capillary rise h for liquid in tube of radius r:Read the answer and worked solution →Two wires of same material, same length, but cross-sections 1 mm² and 2 mm². Same load: ratio of extensions:Read the answer and worked solution →Hydraulic press: small piston area 5 cm², large piston area 50 cm². Force on small piston 20 N. Force on large:Read the answer and worked solution →

Worked practice questions

Pascal's law states pressure applied to enclosed fluid is:

  1. Lost
  2. Transmitted equally in all directions
  3. Stored
  4. Halved
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Correct answer: B. Transmitted equally in all directions

**Pascal's law:** pressure transmitted equally throughout connected incompressible fluid. **Basis of hydraulic systems:** small force on small piston gives large force on large piston (F₁/A₁ = F₂/A₂).

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Capillary rise h for liquid in tube of radius r:

  1. h = r
  2. h = γ/r
  3. h = ρgh
  4. h = 2γ cos θ / (ρ g r)
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Correct answer: D. h = 2γ cos θ / (ρ g r)

**Jurin's law:** h = 2γ cos θ / (ρ g r). θ = contact angle. **Water in glass:** θ ≈ 0, rises. **Mercury in glass:** θ ≈ 140°, depresses. **Inverse relation:** thinner tube, higher rise.

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Two wires of same material, same length, but cross-sections 1 mm² and 2 mm². Same load: ratio of extensions:

  1. 1:1
  2. 2:1
  3. 1:2
  4. ΔL ∝ 1/A → ratio 2:1 (thinner stretches more)
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Correct answer: D. ΔL ∝ 1/A → ratio 2:1 (thinner stretches more)

ΔL = FL/(AY). At same F, L, Y: ΔL ∝ 1/A. So thinner wire (A = 1 mm²) extends 2× more than thicker (A = 2 mm²). Ratio 2:1.

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