Sub-topic 1
2026 · National Quarterfinal
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Density of a crystalline solid from its unit cell structure and lattice constant
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Sub-topic 2
2024 · National One-Eighth
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Doping and charge neutrality in p-type and n-type semiconductors (true/false)
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Sub-topic 3
2013 · National Preliminary
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Semiconductors become insulators, not conductors, at absolute zero (true/false)
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Sub-topic 4
2016 · National One-Eighth
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P-type semiconductors have excess holes, not excess protons (true/false)
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Sub-topic 5
2016 · National One-Eighth
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N-type semiconductors remain electrically neutral overall despite excess electrons (true/false)
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Sub-topic 6
2016 · National One-Eighth
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Intrinsic semiconductors have equal electron and hole concentrations (true/false)
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Sub-topic 7
2017 · National Semifinal
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Riddle: the semiconductor, an insulator only at absolute zero
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