1. Who invented DNA Structure ?

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

2. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

3. Who invented Submarine ?

Answer:

John Philip Holland

4. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

5. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

6. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.