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Kinetic Theory and First Law of Thermodynamics MCQs — Physics (page 8)

180 multiple-choice questions on Kinetic Theory and First Law of Thermodynamics from Physics, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

176. When a gas is compressed quickly (no time for heat flow), its temperature rises because:

  1. its molecules get bigger
  2. heat flows in from outside
  3. work done on it increases its internal energy
  4. its mass increases

Answer: C) work done on it increases its internal energy

Explanation: Adiabatic compression. SLO P-11-C-12 · Understanding

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177. A fixed mass of gas at 1 10^5 Pa occupies 6 L. At constant temperature it is changed to 2 L. The new pressure is:

  1. 3 10^5 Pa
  2. 1.5 10^5 Pa
  3. 6 10^5 Pa
  4. 33,300 Pa

Answer: A) 3 10^5 Pa

Explanation: p1V1 = p2V2 Rightarrow p2 = 1 10^5 62 = 3 10^5 Pa. SLO P-11-C-10 · Application

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178. Deriving W = pDelta V: a piston of area A moves Delta x under force F = pA, so W =

  1. pA
  2. pADelta x = pDelta V
  3. pADelta x
  4. pDelta x

Answer: B) pADelta x = pDelta V

Explanation: ADelta x is the volume change. SLO P-11-C-06 · Application

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179. The SI unit of the Boltzmann constant is:

  1. J K^-1
  2. mol^-1
  3. J s
  4. J mol^-1 K^-1

Answer: A) J K^-1

Explanation: Energy per kelvin (per molecule). SLO P-11-C-04 · Knowledge

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180. A rise in temperature of a solid means its atoms:

  1. vibrate with greater average kinetic energy
  2. become larger
  3. stop moving
  4. gain mass

Answer: A) vibrate with greater average kinetic energy

Explanation: Temperature measures average KE. SLO P-11-C-02 · Understanding

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