1. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

2. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

3. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

4. Who invented Vitamin C ?

Answer:

Scottish naval surgeon James Lind in 1747

5. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

6. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

7. Who invented Atomic Bomb ?

Answer: J. Robert Oppenheimer of U.S.A. in 1945