Science and technology

1. What's measured in volts and amps?
2. The number systems used in ancient times such as the Roman numerals did not have a symbol for zero. True/false?
3. When was the decimal system having ten numerals from 1-9 and 0 invented?
4. In which year was vaccination discovered by the British doctor, Edward Jenner?
5. Who risked being struck by lightning to make a great discovery?
6. Which kind of surgery can restore or improve a patient's appearance?
7. Name the four blood groups.
8. Which famous structure stretches from the Atlantic Ocean to the Pacific Ocean?
9. When was the first Russian satellite, Sputnik 1 launched?
10. What was the name of the first powered aircraft built by American inventors, Orville and Wibur Wright, that took to the air?

[Answers]

1. Electricity.

2. True. It didn't seem necessary at that time but calculating was difficult.

3. About 2,000 years ago in India. The symbol for nothing which is zero is vital in arithmetic. In any number the position of each digit or numerical from the right shows how many ones, tens, hundreds, thousands and so on are there in the number.

4. In 1796. He injected people with cowpox germs to stop people contracting cowpox.

5. The famous American scientist and statesman Benjamin Franklin. To prove that lightning is electricity he flew a kite up into the clouds during a thunderstorm with the string connected to an electricity detector which showed that electricity was flowing down the string towards the ground.

6. Plastic surgery.
7. A, B, AB and O. They are further classified as negative and positive.
8. The Panama Canal.
9. On October 4, 1957.

10. Flyer 1. It made its first flight at Kitty Hawk in North Carolina on December 17, 1903.