Important Inventions and Discoveries in World » Exercise - 111. Which of the following was first patented by an Australian in 1889? (a) Electric Drill (b) Electric Shaver (c) Electric Fence (d) Electric Heater
Tags: electric, inventions, discoveries, exercise, general, awareness
Important Inventions and Discoveries in World » Exercise - 167. Who invented the battery? (a) John Wilkinson (b) Alessandro Volta (c) James Hargreaves (d) Thomas Edison
Tags: inventions, discoveries, exercise, battery, volta, general, awareness