16.  In frictional fluid flow, the following quantity is 
a.  constant along a streamline. 
b.  not constant along a streamline. 
c.  increased in the direction of flow. 
d.  none of these. 
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Answer: (b).not constant along a streamline.

17.  What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the airwater iterface? The balloon is of radius 0.1 m and is filled with air. 
a.  A 
b.  B 
c.  C 
d.  D 
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Answer: (a).A

18.  For the manometer set up shown in the figure, the pressure difference Pᴀ  Pʙ is given by 
a.  A 
b.  B 
c.  C 
d.  D 
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Answer: (a).A

19.  Drag coofficient Cᴅ, in Stoke's law range is given by 
a.  A 
b.  B 
c.  C 
d.  D 
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Answer: (b).B

20.  In power law, consider the following equation, then the fluid is 
a.  Newtonian 
b.  dilatant 
c.  thixotropic 
d.  rheopectic 
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Answer: (a).Newtonian
