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GATE 2021 BM – Question 26

Biomaterials and Tissue Engineering · Biomaterial Characterization · 1 mark · Multiple choice

Water contact angles on surfaces A and B are θA and θB as shown. Which statement is true?

Diagram for GATE 2021 BM question 26
  1. A is hydrophilic and B hydrophobic
  2. A is hydrophobic and B hydrophilic
  3. Both are hydrophilic
  4. Both are hydrophobic

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Show answer and explanation

Correct answer: (A) A is hydrophilic and B hydrophobic

Explanation

Surface A has a contact angle less than ninety degrees, showing favorable water wetting and hydrophilicity. B has an angle greater than ninety degrees and is hydrophobic. Contact angle is measured through the water phase at the solid surface. Therefore A.

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