The extension beyond the discontinuity used in repairs is 10 mm. What is this length in inches?

The extension beyond the discontinuity used in repairs is 10 mm. What is this length in inches?

• A. 3/8 inch
• B. 1/2 inch
• C. 1/4 inch
• D. 5/16 inch

Answer: (A)

Understanding the measurement conversion is the key. The extension is 10 mm, and to compare with common inch sizes we convert to inches: 10 mm ÷ 25.4 mm/in ≈ 0.3937 in. Look at the given inch options: 3/8 in is 0.375 in, 1/2 in is 0.500 in, 1/4 in is 0.250 in, and 5/16 in is 0.3125 in. The value 0.3937 in sits between 0.375 and 0.500, but it is much closer to 0.375 than to 0.500. Among the choices, 3/8 in is the closest standard fraction. In welding practice, tolerances and repairs often reference the nearest common fractional inch, so 3/8 inch is the best match for 10 mm.

Understanding the measurement conversion is the key. The extension is 10 mm, and to compare with common inch sizes we convert to inches: 10 mm ÷ 25.4 mm/in ≈ 0.3937 in.

Look at the given inch options: 3/8 in is 0.375 in, 1/2 in is 0.500 in, 1/4 in is 0.250 in, and 5/16 in is 0.3125 in. The value 0.3937 in sits between 0.375 and 0.500, but it is much closer to 0.375 than to 0.500. Among the choices, 3/8 in is the closest standard fraction.

In welding practice, tolerances and repairs often reference the nearest common fractional inch, so 3/8 inch is the best match for 10 mm.