In the expression ±(0.2 mm + 5 ppm), the 5 ppm term is distance-dependent.

• A. Distance-dependent
• B. Angle-dependent
• C. Time-dependent
• D. Constant

Answer: (A)

In this expression, you’re combining an absolute error term with a relative error term. The 0.2 mm part is fixed and does not change with distance. The 5 ppm part is a relative (parts-per-million) error, which means it scales with the distance being measured. If the distance is D, the error from the 5 ppm term is 5×10^-6 × D, so it grows as D grows. That’s why this term is distance-dependent: it’s not a constant amount, but a fraction of the distance itself.

For example, at 100 m the 5 ppm contribution is 0.5 mm, and at 1000 m it’s 5 mm. The overall uncertainty is the sum of a constant 0.2 mm and this distance-proportional term. The other options don’t fit because the ppm term doesn’t stay fixed (not constant), and it isn’t tied to angle or time.