1. In what year was Sydney Harbour Bridge opened?

2. Which organ produces insulin?

3. In what year was there a radiation leak alert at Three Mile Island in Pennsylvania, USA, when the atomic core began to melt down?

4. In what year was the failed third attempt at a moon landing, when Apollo 13 malfunctioned in flight and initiated an heroic effort to get the three astronauts safely back to Earth?

5. What type of rock is formed from volcanic activity?

6. In which year did Scottish inventor John Logie Baird successfully get television pictures to work?

7. What law states that for every action, there is an equal and opposite reaction?

8. How long was the longest-lasting rainbow on record, seen over North Wales, UK, in 1979.

9. In what year did Thomas Edison patent his electric lamp?

10. In what year did the Spitfire fighter plane make its maiden flight?