1. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

2. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

3. Who invented Transformer ?

Answer:

Ottó Bláthy

4. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.

5. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

6. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

7. Who invented DNA Structure ?

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