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Fluid Statics and Dynamics MCQs — Physics (page 8)

180 multiple-choice questions on Fluid Statics and Dynamics 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. In a horizontal pipe, fluid moving from a wide to a narrow section:

  1. speeds up and its pressure rises
  2. keeps the same speed and pressure
  3. speeds up and its pressure drops
  4. slows and its pressure drops

Answer: C) speeds up and its pressure drops

Explanation: Continuity + Bernoulli. SLO P-11-B-39 · Application

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177. A Bunsen burner draws in air at its base because:

  1. the flame pulls air
  2. the fast gas jet lowers the pressure near the air hole
  3. air is heavier than gas
  4. it has a fan

Answer: B) the fast gas jet lowers the pressure near the air hole

Explanation: Bernoulli effect. SLO P-11-B-44 · Application

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178. Superfluidity was first discovered in:

  1. liquid helium-4
  2. liquid nitrogen
  3. water
  4. mercury

Answer: A) liquid helium-4

Explanation: Kapitza, Allen and Misener (1937). SLO P-11-B-43 · Understanding

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179. The viscous force between layers of a fluid depends on:

  1. only the density
  2. the velocity gradient between the layers
  3. the atmospheric pressure
  4. the colour of the fluid

Answer: B) the velocity gradient between the layers

Explanation: Newton's law of viscosity: F = eta A Delta vDelta y. SLO P-11-B-41 · Understanding

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180. If a superfluid is stirred, the vortices:

  1. keep spinning indefinitely
  2. freeze
  3. slow down gradually
  4. stop immediately

Answer: A) keep spinning indefinitely

Explanation: No viscosity to dissipate the rotation. SLO P-11-B-43 · Understanding

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