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AP Intermediate 1st Year Mechanical Properties of Solids and Fluids — practice questions

Explore 37 free Mechanical Properties of Solids and Fluids questions in AP Intermediate 1st Year 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 1–30 of 37.

Which of the following is the correct definition of **stress** in a deformed body?Read the answer and worked solution →A material that returns to its original shape once the deforming force is removed is said to beRead the answer and worked solution →The SI unit of Young's modulus isRead the answer and worked solution →On the stress-strain curve of a ductile material, the **proportional limit** is the point up to whichRead the answer and worked solution →A uniform pressure $P$ is applied isotropically to a solid sphere of bulk modulus $K$. The fractional change in volume isRead the answer and worked solution →The Poisson's ratio of a material is defined asRead the answer and worked solution →The theoretical range of Poisson's ratio for an isotropic material isRead the answer and worked solution →The elastic potential energy stored per unit volume in a stretched wire (within the elastic limit) isRead the answer and worked solution →As per your syllabus, an ISOLATED system is exemplified by which container?Read the answer and worked solution →As per your syllabus, for an ADIABATIC process (no heat exchange, q = 0), the first law reduces to which form?Read the answer and worked solution →As per your syllabus, + eqn 5.7, the ENTHALPY H is defined as which quantity?Read the answer and worked solution →As per your syllabus, for vaporisation of 1 mol of water at 100 °C and 1 bar, given ΔH = 41 kJ/mol, what is ΔU? (R = 8.3 J/mol K)Read the answer and worked solution →As per your syllabus, Δ_f H° of methane CH₄(g) is which value?Read the answer and worked solution →As per your syllabus, the standard enthalpy of combustion of GLUCOSE (C₆H₁₂O₆) is which?Read the answer and worked solution →As per your syllabus, in CH₄ atomisation requires 1665 kJ/mol. What is the MEAN C-H bond enthalpy?Read the answer and worked solution →As per your syllabus, the bond enthalpy of N≡N triple bond is which value — among the highest known for diatomics?Read the answer and worked solution →As per your syllabus, the Δ_f H° of C(diamond) is which value (note: NOT zero, because graphite — not diamond — is the reference state of carbon)?Read the answer and worked solution →As per your syllabus, eqn 5.18, the entropy change for a REVERSIBLE process is given by which expression?Read the answer and worked solution →As per your syllabus, eqn 5.20-21, GIBBS energy G and its change ΔG at constant T are given by which expressions?Read the answer and worked solution →As per your syllabus, a reaction with ΔH < 0 AND ΔS > 0 is spontaneous under which condition?Read the answer and worked solution →As per your syllabus, eqn 5.23, the relation between ΔG° and equilibrium constant K is which?Read the answer and worked solution →NEET · Physics · Compressive or Tensile StressRead the answer and worked solution →NEET · Physics · Bernoulli & Continuity — Spot the ErrorRead the answer and worked solution →Pressure at depth h below the free surface of a liquid of density ρ (with atmospheric pressure P₀ above) is:Read the answer and worked solution →Pascal's law states that pressure applied at any point of an enclosed incompressible fluid is:Read the answer and worked solution →A body immersed in a fluid experiences an upward buoyant force equal to the weight of fluid displaced. This is:Read the answer and worked solution →For a steadily flowing incompressible fluid, the continuity equation A·v = constant means:Read the answer and worked solution →Bernoulli's equation for steady, non-viscous, incompressible flow along a streamline reads:Read the answer and worked solution →The terminal velocity v_t of a small sphere of radius r falling in a fluid of viscosity η is given by Stokes' law as:Read the answer and worked solution →Reynolds number Re is dimensionless and given by Re = ρ v d / η, where d is a characteristic length. For Re ≪ 1, the flow is:Read the answer and worked solution →

Worked practice questions

Which of the following is the correct definition of **stress** in a deformed body?

  1. the change in length per unit original length
  2. the internal restoring force per unit area
  3. the external force applied to the body
  4. the volume change per unit applied force
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Correct answer: B. the internal restoring force per unit area

Stress $\sigma = F/A$ is the internal restoring force per unit cross-sectional area that the body develops to resist deformation. Option A defines *strain* (a dimensionless ratio). **Option C is the applied force itself, not stress.**

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A material that returns to its original shape once the deforming force is removed is said to be

  1. plastic
  2. elastic
  3. brittle
  4. ductile
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Correct answer: B. elastic

Elasticity is the property of returning to the original configuration when the deforming force is removed. Plastic materials retain the deformation. Brittle and ductile describe *how* a material fails or yields, not whether it recovers.

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The SI unit of Young's modulus is

  1. $\text{N}$
  2. $\text{N m}^{-2}$
  3. $\text{N m}^{2}$
  4. dimensionless
Show answer and solution

Correct answer: B. $\text{N m}^{-2}$

$Y = \text{stress}/\text{strain}$. Strain is dimensionless, so $Y$ has the units of stress: $\text{N m}^{-2}$ (i.e. Pa). The same goes for shear modulus $G$ and bulk modulus $K$.

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