Unit 7: B3 Product in practice
Topic 7.2: Structural systems applied Questions
Practice 20 exam-style questions for IB Design Technology Topic 7.2. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
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A folding chair changes shape sideways without anything breaking. What has failed?
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A shelf sags. Which change reduces the deflection most for the least material?
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A 40 mm² bar carries 2,000 N. What is the stress?
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Where on a stress-strain graph is Young's modulus taken?
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A tie bar of cross-section 8 mm × 4 mm and length 500 mm carries 4,800 N and extends by 0.75 mm. Apply the formulae to find the stress, the strain and Young's modulus, and identify a likely material.
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Unlock Question6Identify1 mark
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Where does a crack in a loaded part usually start?
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Unlock Question7State1 mark
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An FEA plot shows red at one corner. What does that alone tell you?
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A 600 N load sits at the mid-span of a beam on two end supports. What is each reaction?
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Arrows on a member point towards each other. What is the member doing?
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A component fails at 9,000 N and is designed with a safety factor of 3. What is its allowable load?
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A swing seat carries a 100 kg user. Why is the design load per chain not 500 N?
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Unlock Question12Analyse6 marks
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A folding camping chair collapses sideways when a user leans back. Analyse the structure and recommend two changes.
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A wall-mounted coat rack pulls away from the wall at the top. Explain what is happening and how to fix it.
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A 2 m aluminium tie of cross-section 100 mm² carries 7,000 N. Apply E = 70 GPa to find how much it extends, and say whether that matters.
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Unlock Question15Explain6 marks
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A moulded polymer bracket cracks after eight months outdoors. FEA shows a peak stress of 18 MPa at a square internal corner, against a material yield of 45 MPa. Explain the failure.
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FEA of a steel lever shows 260 MPa at a drilled hole, against a yield of 250 MPa. Identify the problem and two changes.
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A 3 m shelf rests on two brackets at its ends. A 240 N load sits 0.5 m from the left bracket. Apply the conditions of equilibrium to find both reactions, and state where the shelf is most likely to fail.
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A 2 m beam on two end supports carries 600 N at mid-span and 400 N at 1.5 m from the left. Apply moments to find both reactions.
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A playground swing seat hangs from two chains. The heaviest intended user is 100 kg, the swing is used dynamically, and each chain fails at 12,000 N. Apply a suitable safety factor and check the design.
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A shelf bracket fails in testing at 1,800 N. Apply a safety factor of 3 to find its rated load, and state one assumption.
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