1. C 2. A 3. C 4. D 5. C 6. A 7. A 8. D 9. B 10. B 11. (a)(i) Alternating voltage can be stepped up or down with little power loss whereas direct voltage cannot be stepped up or down easily. (ii) Step-up transformer with turn ratio 2. (iii) Assuming no power losses in the transformer, 120Ip = 1000 Ip = 8.33 A r.m.s. (b)(i) Cheaper to install and maintain. (ii) Can be blown against buildings in windy conditions.