Class 11 Physics Mechanics Mechanical Properties of Fluids
The force of viscosity is:
(a)
electromagnetic.
(b)
gravitational.
(c)
nuclear.
(d)
weak.
Correct answer: (a) 
Solution: All forces in the universe can be broadly divided into 4 categories. Gravitational, electromagnetic nuclear, weak forces. 

Since, the force of viscosity is a result of interaction between different layers of the fluid, therefore it involves interaction between molecules of the layers. Hence it is a type of electromagnetic force. 

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mechanical properties of fluids
friction
laws of motion
circular motio
nlm