1. Who invented Submarine ?

Answer:

John Philip Holland

2. Who invented Aeroplane

Answer: Orville & Wilbur Wright in 1903

3. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

4. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832

5. Who invented Transformer ?

Answer:

Ottó Bláthy

6. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

7. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683