WAEC 2015 Physics · Question 42
The pressure applied to an enclosed fluid to one end id transmitted equally throughout the fluid and to the container walls. This statement is
Options
- A.Archimede's principle
- B.Bernoulli's principle
- C.Pascal's principle Heisenberg's
- D.Heisenberg's uncertainty principle
Answer: C. Pascal's principle Heisenberg's
Explanation written with AI and checked against the answer key
Step 1: Analyze the question The statement says that pressure applied to an enclosed fluid is transmitted equally throughout the fluid and to the walls of its container. We need to name the principle that says this.
Step 2: Explain the concept This is Pascal's principle (Pascal's law): pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid and to the walls of the container.
Here is how the other options differ:
- Archimedes' principle: When a body is wholly or partly immersed in a fluid, it experiences an upthrust equal to the weight of the fluid it displaces. This explains floating and sinking.
- Bernoulli's principle: In a moving fluid, an increase in speed comes with a decrease in pressure. This explains how aircraft wings generate lift.
- Heisenberg's uncertainty principle: This is from quantum physics. It says we cannot know both the exact position and the exact momentum of a particle at the same time. It has nothing to do with fluids.
Step 3: Match the statement The key phrases are "enclosed fluid" and "transmitted equally throughout." These point directly to Pascal's principle. It is the basis of hydraulic machines such as hydraulic jacks, car brakes, and hydraulic presses:
P = F₁/A₁ = F₂/A₂
Step 4: Answer Option C is printed a bit messily in your question ("Pascal's principle Heisenberg's"), but it is clearly meant to be Pascal's principle.
Tip: Link each principle to a keyword:
- Pascal → Pressure in enclosed fluids (hydraulics)
- Archimedes → Upthrust (floating)
- Bernoulli → moving fluids (speed and pressure)
Both Pascal and Pressure start with "P". Good luck with your preparation!
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