Assertion :Force of buoyancy due to atmosphere on a small body is almost zero (or negligible). Reason: If a body is completely submerged in a fluid, then buoyant force is zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Buoyant force on a body $= V ρ g$
where V is the volume of body immersed in liquid, $ρ$ is the density of water.
Since density of air is very low and volume of a small body would also be less, buoyant force on it would be negligible.
Assertion is correct.
When a body is completely immersed in a fluid, it buoyant force is maximum since V is maximum according to Archimede's principle.

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