Class 12 Physics Chapter 4
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Questions and Answers

What principle explains the buoyant force acting on an object submerged in a fluid?

  • Archimedes' Principle (correct)
  • Pascal's Principle
  • Bernoulli's Principle
  • Newton's Second Law
  • Which equation represents the relationship between pressure, volume, and temperature in an ideal gas?

  • P = V/nT
  • PV = kT
  • PV = nRT (correct)
  • PV = RT
  • Which of the following describes the phenomenon of thermal expansion in solids?

  • Decrease in density with temperature increase
  • Increase in dimension with the rise in temperature (correct)
  • Dimensional contraction at high temperatures
  • Total decay of molecular structure upon heating
  • What condition is necessary for total internal reflection to occur?

    <p>The angle of incidence must be greater than the critical angle.</p> Signup and view all the answers

    In the context of wave interference, what is typically observed when two waves interfere constructively?

    <p>Increase in amplitude</p> Signup and view all the answers

    Study Notes

    Buoyant Force

    • The principle that explains buoyant force is Archimedes' Principle, which states that an object submerged in a fluid experiences an upward force equal to the weight of the fluid displaced.

    Ideal Gas Law

    • The equation representing the relationship between pressure (P), volume (V), and temperature (T) in an ideal gas is the Ideal Gas Law: PV = nRT, where n is the number of moles and R is the universal gas constant.

    Thermal Expansion in Solids

    • Thermal expansion in solids is the phenomenon where a solid increases in size when its temperature rises, due to the increased kinetic energy of its atoms causing them to move apart.

    Total Internal Reflection

    • Total internal reflection occurs when light traveling through a denser medium hits a boundary with a less dense medium at an angle greater than the critical angle, resulting in the light being completely reflected.

    Wave Interference

    • When two waves interfere constructively, they combine to produce a wave of greater amplitude, leading to increased intensity of the resulting wave.

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    Description

    Test your understanding of buoyancy, gas laws, thermal expansion, and wave interference with this quiz. Questions cover fundamental principles that govern these physical phenomena, ensuring a comprehensive review of Chapter 4. Dive into the fascinating world of physics and assess your knowledge!

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