Statement I: A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink.
Statement II: The buoyancy of an object depends both on the material and shape of the object.

Easy

A

If both statement I and statement II are true and statement II is the correct explanation of statement I.
B

If both statement I and statement II are true but statement II is not the correct explanation of statement I.
C

If statement I is true but statement II is false
D

If both statement I and statement II are false

Solution

Needle floats due to surface tension there is no role of buoyant force in its floating
Buoyant force = $Vσg$
where V = volume of body submerged in liquid
$σ$ = density of liquid.
i.e., the buoyancy of an object depends on the shape of the object.

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