1. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

2. Who invented Bleaching Powder ?

Answer: Tennant of Britain in 1798

3. Who invented Proton ?

Answer:

Ernest Rutherford

4. Who invented Transformer ?

Answer:

Ottó Bláthy

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Bacteria ?

Answer: Leeuwenhock of Netherlands in 1683

7. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin