AIIMS 2019 Physics Surface Tension Assertion Reason Question
Water drops stick to the glass surface due to the cohesive forces between them. Water have properties of surface tension that makes them round so that they cover the smallest possible surface area. Hence, both assertion and reason are true but reason is not the correct explanation of assertion.
Both assertion and reason are true, and reason is the correct explanation of assertion.
Both assertion and reason are true, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Both assertion and reason are false.
Correct Answer
Detailed Explanation
Option B is correct because the assertion accurately describes how cohesive forces among H₂O molecules cause water drops to adhere to glass surfaces, while the reason correctly identifies that surface tension leads to the formation of spherical shapes to minimize surface area. However, the reason does not explain the adhesion to glass, which is primarily due to adhesive forces between water and the glass surface. Option A is incorrect because, while both statements are true, the reason does not adequately explain the assertion. Options C and D are incorrect as both the assertion and reason are indeed true.
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