Which of the following processes will be least affected by the viscosity of water ?
Options:
A .  
Water flowing through a pipe
B .  
Air bubble rising up through water
C .  
A wide, shallow sheet of water flowing on a flat surface
D .  
Water flowing out through a hole in the side of a tank
Answer: Option D : D
When water flows out of a hole in a tank, it is in contact with the edges of the hole over a very small area, and therefore viscosity effects are small
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