Properties Of Solids And Liquids Question 148
Question: Assertion : A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink. Reason : The buoyancy of an object depends both on the material and shape of the object.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason are both false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
Needle floats due to surface tension, there is no role of buoyant force in its floating. Buoyant force = $ V\sigma g $ 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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