Assertion A: When both gravitational and viscous forces are predominant in a flow scale ratio can be chosen at will.

Reason R: With both gravitational and viscous forces being predominant, scale ratio depends upon kinematic viscosity of the fluids.

- 1
  
  Both A and R are true and R is the correct explanation of A
- 2
  
  Both A and R are true but R is not a correct explanation of A
- 3
  
  A is true but R is false
- 4
  
  A is false but R is true

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