1. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

2. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

3. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

4. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

5. Who invented Submarine ?

Answer:

John Philip Holland

6. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

7. Who invented DNA Structure ?

Answer: Crick(UK), Waston(US), Wilkins(UK) in 1951