1.

Account for the following:(a) Drops of liquid assume spherical shape on falling.(b) Viscosity of a liquid decreases with rise in temperature.

Answer»

(a) Drops of liquid assume spherical shape on falling due to surface tension. Liquid tends to have a minimum surface area because of surface tension, so, the small drops of liquid are spherical. 

(b) Viscosity of a liquid decreases with rise in temperature because force required to maintain the flow decreases due to increase in velocity.



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