Physics
When a fish has to rise up in water, it diffuses oxygen gas from its blood into the bladder, so its volume …………… and its average density …………… .
- decreases, decreases
- increases, decreases
- decreases, increases
- increases, increases
Answer
increases, decreases
Reason — When a fish has to rise up in water, it diffuses oxygen gas from its blood into the bladder, so its volume increases and its average density decreases
This increases the volume of water displaced by the fish and so the upthrust on the fish increases due to which it rises up.
Related Questions
Ice bergs float on the surface of water with their …………… portion inside the water surface and …………… portion above the water surface.
- smaller, larger
- larger, equal
- smaller, smaller
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A balloon does not rise indefinitely because :
- the density of air increases with altitude
- the density of air decreases with altitude
- the weight of the displaced air increases.
- None of the above
A ball is made of a material of density ρ, where ρoil < ρ < ρwater with ρoil and ρwater represent the densities of oil and water respectively. The oil and water are immiscible. If the above ball is in equilibrium in a mixture of this oil and water, the figure which represents the equilibrium position is :
- 1.
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- 2.
-exc-5c-icse-9-phy-concise-425x317.png)
- 3.
-exc-5c-icse-9-phy-concise-390x260.png)
- 4.
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A student is given three liquids A, B and C of densities ρ1, ρ2 and ρ3. He has to arrange these liquids in order of their increasing densities. To do so, he takes an object and dips it in each liquid and observes that the object floats with 1/9, 2/11 and 3/7 parts of its volume outside the surface of liquid A, B and C respectively. The correct order is :
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- ρ2 > ρ3 > ρ1
- ρ3 > ρ2 > ρ1
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