AIIMS 2018 Physics Buoyancy MCQ Question
Assertion: A small iron needle sinks in water while a large iron ship floats.
Reason: The shape of iron needle is like a flat surface while the shape of ship is that which makes it easier to float.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The statement illustrates the principle of buoyancy, where an object floats if it displaces a volume of water (H₂O) with a weight equal to or greater than its own weight. An iron needle sinks because its weight exceeds the weight of the water it displaces, while a large iron ship floats because its design allows it to displace a greater volume of water, resulting in an upward buoyant force that exceeds its weight. Therefore, option D is correct as the explanation provided does not accurately reflect the principles of buoyancy. Options A and B are incorrect because they misinterpret the relationship between weight and displaced water in the context of buoyancy.
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