City Guilds Model Questions Vol1 2020 Engineering Question 5

Practice practical question 5 from the 2020 City Guilds Model Questions Vol1 Engineering examination. This question covers Young's modulus, Tensile testing, Data analysis, Error analysis .

City Guilds Model Questions Vol1 2020 Engineering Practical

Topics: Young's modulus Tensile testing Data analysis Error analysis

Question 5 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2020 • ENGINEERING • practical

A wooden rod is to be tested for its Young's modulus using a simple tensile set‑up. The rod has a measured length of 0.500 m and a diameter of 20 mm. The set‑up consists of a fixed clamp at the upper end, a spring balance attached to the lower end, and a metre rule to read the extension. Five different loads are applied and the extension is recorded three times for each load as shown in the table below. | Load (N) | Extension readings (mm) | |----------|--------------------------| | 10 | 0.45, 0.48, 0.46 | | 20 | 0.92, 0.95, 0.94 | | 30 | 1.38, 1.41, 1.40 | | 40 | 1.84, 1.86, 1.85 | | 50 | 2.31, 2.34, 2.33 | Using this data, answer the following:

Question Parts

( a )

List all the apparatus required for the experiment and give a brief description (one or two sentences) of how the set‑up is arranged.

( b )

Calculate the average extension for each load and present the results in a table.

( c )

Using the average values, determine the gradient (slope) of the best‑fit straight line for a load‑extension graph (load on the y‑axis, extension on the x‑axis). State the method you used.

( d )

Calculate the Young's modulus (E) of the wood using the slope obtained in part (c). Show all steps and give the final answer in scientific notation (Pa).

( e )

Identify two possible sources of error in this experiment and suggest a practical way to minimise each error.

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About This Question

This is City Guilds Model Questions Vol1 2020 Engineering Question 5. It is one of the practical questions from the 2020 City Guilds Model Questions Vol1 Engineering examination.

The question covers Young's modulus, Tensile testing, Data analysis, Error analysis .

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