Question

A viscous fluid flows over a flat plate at zero angle of attack            

Assertion (A): The thickness of boundary layer is an ever increasing one as it’s distance from the leading edge of the plate increases

Reason (R): In practice, 99 percent of the depth of the boundary layer is attained within a short distance from the leading edge.

1. Both A and  are individually true and R is the correct explanation of A
2. Both A and R are individually true but R is both the correct explanation of A
3. A is true but R is false
4. A is false but R is true