City Guilds Model Questions Vol1 2021 Engineering Question 39

Practice objective / multiple choice question 39 from the 2021 City Guilds Model Questions Vol1 Engineering examination.

City Guilds Model Questions Vol1 2021 Engineering Objective / Multiple Choice Hard Difficulty
Question 39 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2021 • ENGINEERING • objective

A length is measured with two instruments. The steel ruler (least count 0.5 mm) gives a reading of 125.0 mm, and the digital caliper (least count 0.1 mm) gives 124.8 mm. Assuming the uncertainties are uniformly distributed, compute the weighted mean length and its standard uncertainty. Also state which instrument contributes more to the final uncertainty.

Answer Options

A. Weighted mean = 124.79 mm; combined standard uncertainty = 0.025 mm; digital caliper contributes more
B. Weighted mean = 124.81 mm; combined standard uncertainty = 0.035 mm; steel ruler contributes more
C. Weighted mean = 124.85 mm; combined standard uncertainty = 0.030 mm; steel ruler contributes more
Correct Answer D. Weighted mean = 124.81 mm; combined standard uncertainty = 0.028 mm; digital caliper contributes more
Correct Answer
D
Correct Option:
Weighted mean = 124.81 mm; combined standard uncertainty = 0.028 mm; digital caliper contributes more

About This Question

This is City Guilds Model Questions Vol1 2021 Engineering Question 39. It is one of the objective questions from the 2021 City Guilds Model Questions Vol1 Engineering examination.

Difficulty level: Hard .

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