Unit 7: B3 Product in practice
Topic 7.4: Electronic systems applied Questions
Practice 20 exam-style questions for IB Design Technology Topic 7.4. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Justify6 marks
2026
A public washroom tap is to run only while hands are beneath it. Justify the sensor you would specify, and say where it must sit.
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2026
Which finding turns a component list into an analysis?
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Unlock Question3Describe6 marks
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An LED indicator on a prototype is dim. Describe how you would use test equipment to find out why.
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Unlock Question4Construct6 marks
2026
Construct a microcontroller circuit for a greenhouse vent: a temperature sensor, a manual override button, and a motor that opens the vent.
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2026
Two 100 µF capacitors are connected in parallel. What is the total capacitance?
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A 9 V supply feeds a divider of 20 kΩ over 10 kΩ. What is the junction voltage?
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Unlock Question7State1 mark
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How many rows does a truth table with three inputs need?
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Unlock Question8State1 mark
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On a circuit diagram, what should be drawn first?
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Why are a relay's coil and contacts drawn separately, joined by a dashed line?
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On a circuit board, what do the widest tracks usually carry?
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Unlock Question11Identify1 mark
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A meter reads 2.5 V on a microcontroller output pin. What could an oscilloscope reveal?
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Unlock Question12Apply6 marks
2026
A battery-powered meter runs a 60 mA display for 2 hours a day and draws 150 µA the rest of the time. Apply the equations to find the daily charge used and the life of a 1,200 mAh cell.
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A switch is wired from an input pin to 0 V with no other component. What is wrong?
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Unlock Question14State1 mark
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How many outputs may a decision symbol have on a flow diagram?
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Why does a greenhouse vent program use 25 °C to open and 22 °C to close?
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Which output device moves to a commanded angle and holds it?
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Unlock Question17Construct6 marks
2026
Construct a flow diagram for a greenhouse vent that opens above 25 °C and closes below 22 °C.
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Why is a relay used rather than a transistor to switch a mains heater?
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Why is a load cell the wrong sensor for a bin that reports when it is full?
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Unlock Question20Identify1 mark
2026
Which protocol needs no infrastructure beyond the other device?
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