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Q: When a 30-metre chain is tested for its accuracy against a steel tape standardised at 20ºC with an 8 kg pull, its overall length should NOT deviate beyond 30 _____.
  • A. ±8 mm
  • B. ±5 mm
  • C. ±15 mm
  • D. ± 10 mm
Correct Answer: Option A - Deviation is steel tape at 20⁰C and 8 kg pull. 20 m = ± 5 mm 30 m = ± 8 mm
A. Deviation is steel tape at 20⁰C and 8 kg pull. 20 m = ± 5 mm 30 m = ± 8 mm

Explanations:

Deviation is steel tape at 20⁰C and 8 kg pull. 20 m = ± 5 mm 30 m = ± 8 mm