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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

Why should detergents have small angles of contact?

Answer»

Since, Capillary rise = h = 2TCos/rPg

i.e. h is directly dependent on θ (Angle of contact) 

Now If θ→ Small then Cos θ is large and if detergents should have smaller angle of contact then detergent will pentrate more in the cloth and clean better. 
Discussion
2.

The antiseptics used for cuts and wounds in human flesh have low surface tension. Why? 

Answer»

Since the surface tension of antiseptics is less, they spread more on cuts and wounds and as a result, cut or wound is healed quickly.  
Discussion