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Floating and Sinking

An egg sinks ...

Question

An egg sinks in fresh water but floats in highly salty water. Give reason.
[3 marks]

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Solution

Upthrust is the upward force acting on a body when it is partially or fully immersed in a liquid, it is also referred to as buoyant force.
[1 mark]
Upthrust acting on egg in fresh water is less than the weight of egg. Therefore, it sinks in fresh water. However, the density of salty water is much greater than the density of fresh water, so upthrust acting on egg in salty water is greater than the weight of egg. Therefore, it floats in salty water.
[2 marks]

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Q. A fresh egg sinks in pure water, whereas it floats in salty water. This is because
(a) salt water is denser than pure water.
(b) the egg is less dense than pure water.
(c) salt water is less dense than an egg.
(d) salt water is denser than the egg.

Q. When a fresh egg is put into a beaker filled with water, it sinks. When the same egg is put in a strong salty water, then it floats. Which of the following is the incorrect statement in this context ?
(1) salt water enters into egg by osmosis and makes it lighter
(2) salt water exerts more buoyant force
(3) salt water is denser than tap water
(4) upthrust exerted by a liquid depends on its density

Q. An egg sinks in fresh water but floats in highly salty water. Give reason.

Q. A fresh egg sinks in pure water, whereas it floats in saturated salty water. This is due to.

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