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JEE Main Mechanical Properties of Solids and Fluids — practice questions — page 2

Explore 127 free Mechanical Properties of Solids and Fluids questions in JEE Main 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 31–60 of 127.

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 →Match each property of matterRead the answer and worked solution →Solids topic or fluids topic?Read the answer and worked solution →A liquid poured into a container acquires a:Read the answer and worked solution →The free surface of a liquid possesses some additional:Read the answer and worked solution →Surface tension concerns only liquids because gases have no:Read the answer and worked solution →Surface tension is defined as a force per unit:Read the answer and worked solution →Surface tension also equals the surface energy per unit:Read the answer and worked solution →The surface energy of an interface depends on:Read the answer and worked solution →Compared with molecules inside, those at the interface have energy:Read the answer and worked solution →The angle between the tangent to a liquid and the solid is the:Read the answer and worked solution →Whether a liquid spreads or forms droplets is decided by the:Read the answer and worked solution →Water placed on a lotus leaf:Read the answer and worked solution →Water placed on a clean plastic plate:Read the answer and worked solution →An obtuse angle of contact means the liquid:Read the answer and worked solution →Mercury placed on any ordinary surface:Read the answer and worked solution →Water sticks to glass, but mercury does not:Read the answer and worked solution →Oil climbs up a cotton wick in spite of:Read the answer and worked solution →Sap and water rise up to the top of the leaves of a:Read the answer and worked solution →The hair of a paint brush forms a fine tip when it is:Read the answer and worked solution →Free liquid drops and bubbles are spherical if we neglect:Read the answer and worked solution →For a given volume the least surface area belongs to a:Read the answer and worked solution →The pressure inside a spherical drop, against that outside, is:Read the answer and worked solution →Detergents and dying substances act as:Read the answer and worked solution →Waterproofing agents are added to create a large:Read the answer and worked solution →True or false on surface tensionRead 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
Show answer and solution

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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