Surface tension is due to uneven molecular attraction between immiscible fluid media and solid surface. Its importance is governed by dimensionless parameter Which of the Inertia force called Weber number given by We = Surface tension force™ following statements are correct? (i) Surface tension becomes important when the length scale L is small such as in ink jet printing, coating of thin film, oxygenation of water by falling rain drops. (ii) 111 Super-hydrophobicity can be achieved by micro/nano texturing of surface such as in lotus leave, butterfly and dragonfly wing. During oil spill in ocean, oil floats and spreads out due to gravity. By conservation of mass, the oil film becomes thinner as it spreads. Finally, the surface tension force becomes important causing the formation of tiny oil droplets. (A) (B) (C) (D) (i) and (ii) (i) and (iii) (ii) and (iii) All of the above

Surface tension is due to uneven molecular attraction between immiscible fluid media and solid surface. Its importance is governed by dimensionless parameter Which of the Inertia force called Weber number given by We = Surface tension force™ following statements are correct? (i) Surface tension becomes important when the length scale L is small such as in ink jet printing, coating of thin film, oxygenation of water by falling rain drops. (ii) 111 Super-hydrophobicity can be achieved by micro/nano texturing of surface such as in lotus leave, butterfly and dragonfly wing. During oil spill in ocean, oil floats and spreads out due to gravity. By conservation of mass, the oil film becomes thinner as it spreads. Finally, the surface tension force becomes important causing the formation of tiny oil droplets. (A) (B) (C) (D) (i) and (ii) (i) and (iii) (ii) and (iii) All of the above

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Surface tension is due to uneven molecular attraction between immiscible fluid
media and solid surface. Its importance is governed by dimensionless parameter
Which of the
Inertia force
called Weber number given by We =
Surface tension force™
following statements are correct?
(i)
Surface tension becomes important when the length scale L is small such
as in ink jet printing, coating of thin film, oxygenation of water by falling
rain drops.
(ii)
111
Super-hydrophobicity can be achieved by micro/nano texturing of surface
such as in lotus leave, butterfly and dragonfly wing.
During oil spill in ocean, oil floats and spreads out due to gravity. By
conservation of mass, the oil film becomes thinner as it spreads. Finally,
the surface tension force becomes important causing the formation of tiny
oil droplets.
(A)
(B)
(C)
(D)
(i) and (ii)
(i) and (iii)
(ii) and (iii)
All of the above

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