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 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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Where does a crack in a loaded part usually start?
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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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Explain how the form of a rotationally moulded 50-litre polyethylene water barrel that is rolled on its side is designed to resist both the internal pressure of the liquid and the external loads from knocks and rolling over rough ground.
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Explain how the form of a thin-walled polyethylene rainwater tank standing on uneven ground is designed to resist both the internal pressure of the liquid and the external loads from wind and impacts from garden tools.
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Explain how the form of a 15-litre backpack pressure sprayer tank is designed to resist both the internal pressure of the liquid and the external loads from being dropped and carried on the user's back.
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A shelf sags. Which change reduces the deflection most for the least material?
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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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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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