Class 11 Physics · Chapter 5 · Test 3
Archimedes and Fluid Flow
41 MCQs This test covers upthrust and floatation, hot-air balloons, ships and submarines, and streamline and turbulent flow. It also covers ideal fluids, rate of flow, the equation of continuity and numericals.
41 questions · 35 min · 41 marks
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Sample questions
The first 5 of 41. Try each one, then tap to see the answer.
Question 1
Archimedes' principle states that an object immersed in a fluid experiences an upthrust equal to:
- AIts own weight
- BThe weight of the fluid it displaces
- CThe volume of the container
- DThe pressure of the fluid
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Answer: B
The upthrust equals the weight of fluid displaced by the object.
Question 2
The upthrust on an object in a liquid acts:
- ADownward
- BSideways
- CUpward
- DIn a random direction
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Answer: C
Upthrust is an upward force exerted by the liquid.
Question 3
The apparent loss in weight of an immersed object equals:
- AThe volume of the object
- BThe density of the object
- CThe mass of the object
- DThe weight of the fluid displaced
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Answer: D
The apparent reduction in weight is caused by the upthrust, which equals the weight of displaced fluid.
Question 4
The upthrust on a fully submerged object of volume V in a liquid of density ρ is:
- AρgV
- BρV/g
- Cρg/V
- DgV/ρ
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Answer: A
Upthrust = weight of displaced fluid = ρgV.
Question 5
In the derivation, the net upward force on the immersed cylinder is F₂ - F₁, which equals:
- AρgA(h₂ - h₁)
- Bρgh₁A
- Cρg(h₁ + h₂)
- DA(h₂ + h₁)/ρg
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Answer: A
F₂ - F₁ = ρgA(h₂ - h₁), and A(h₂ - h₁) is the volume of liquid displaced.
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