Semiconductors are materials with electrical conductivity between that of a conductor and an insulator. Silicon (Si) and Germanium (Ge) are elemental semiconductors. Gallium arsenide (GaAs) is a compound semiconductor. Quartz is primarily silicon dioxide (SiO₂), which is an excellent electrical insulator.
Which one of the following is not a semiconductor?
Asked in UPSC CDS 1 2017 · Topic: Conductivity (Band Theory of Solids: Conductors, Semiconductors, and Insulators)
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