1. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

2. Who invented Floppy disk ?

Answer: IBM in 1970

3. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Calculus ?

Answer: Newton of Britain in 1670.

6. Who invented Printing Press ?

Answer:

Johannes Gutenberg

7. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.