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Karnataka PUC I Mechanical Properties of Solids and Fluids — practice questions — page 2

Explore 50 free Mechanical Properties of Solids and Fluids questions in Karnataka PUC I 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 31–50 of 50.

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 →Surface tension T of a liquid is best defined as:Read the answer and worked solution →The excess pressure inside a spherical liquid drop of radius R and surface tension T is:Read the answer and worked solution →The height to which a liquid rises in a capillary tube of radius r is (with surface tension T, contact angle θ, density ρ):Read the answer and worked solution →A liquid emerges from a hole at depth h below the free surface of a large open tank. The exit speed (Torricelli's law) is:Read the answer and worked solution →Two soap bubbles of radii R₁ < R₂ are connected by a tube. Air flows:Read the answer and worked solution →A solid object floats with 80 % of its volume submerged in water (ρ_water = 1000 kg m⁻³). The density of the object is:Read the answer and worked solution →Poiseuille's law gives the volume flow rate Q of a viscous fluid through a horizontal pipe of length L and radius r under pressure difference ΔP as:Read the answer and worked solution →

Worked practice questions

As per your syllabus, eqn 5.18, the entropy change for a REVERSIBLE process is given by which expression?

  1. ΔS = q_rev / T
  2. ΔS = nRT
  3. ΔS = q / w
  4. ΔS = q × T
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Correct answer: A. ΔS = q_rev / T

As per your syllabus, eqn 5.18, ΔS = q_rev/T. Entropy change is inversely proportional to T (same q at low T causes more randomness).

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As per your syllabus, eqn 5.20-21, GIBBS energy G and its change ΔG at constant T are given by which expressions?

  1. ΔG = q + w
  2. G = U + pV
  3. G = H − TS; ΔG = ΔH − T ΔS (at constant T)
  4. ΔG = ΔH + T ΔS
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Correct answer: C. G = H − TS; ΔG = ΔH − T ΔS (at constant T)

As per your syllabus, eqn 5.20+5.21, G = H − TS (state function). ΔG = ΔH − TΔS at constant T. Master criterion for spontaneity.

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As per your syllabus, a reaction with ΔH < 0 AND ΔS > 0 is spontaneous under which condition?

  1. Only at low T
  2. At ALL temperatures
  3. Only at high T
  4. Never
Show answer and solution

Correct answer: B. At ALL temperatures

As per your syllabus, ΔH(−) + ΔS(+) ⇒ ΔG = ΔH − TΔS is always negative ⇒ spontaneous at all T.

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