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Q2) [CLO:01] [5 marks] Circle the correct answer: 1. An atom consists of (a) one nucleus and only one electron (b) one nucleus and one or more electrons (c) protons, electrons, and neutrons (d) answers (b) and (c) 2. The most widely used semi-conductive material in electronic devices is: (a) silicon (b) carbon (c) copper (d) germanium 3. The difference between an insulator and a semiconductor is (a) a wider energy gap between the valence band and the conduction band (b) the number of free electrons. (c) the atomic structure (d) answers (a), (b), and (c) 4. The energy band in which free electrons exist is the (a) first band (b) conduction band (c) second band (d) valence band 5. A pentavalent impurity is added to silicon to create (a) germanium (b) a p-type semiconductor (c) an n-type semiconductor (d) a depletion region