First slide
Fluid statics
Question

Consider the following statements.
(A) A needle placed on the surface of the liquid may float whereas a ball of same material will always sink.
(B) Upthurst (or buoyancy) does not depend on material of object. 

Select the correct option.
(a) (A) is false, But (B) is true.
(b) Both (A) and (B) are true.
(c) (A) is true, But (B) is false.
(d) Both (A) and (B) are false.

Moderate
Solution

A is true.

buoyancy = vinρ liquid g

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