1. Who invented Atomic Bomb ?

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

2. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

3. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

4. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

5. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913