1. Who invented Laptop ?

Answer:

Adam Osborne in 1981.

2. Who invented Optical Fibre ?

Answer:

Indian-born American physicist Narinder Kapany

3. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

4. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

5. Who invented Ball-Point Pen ?

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

6. Who invented Laser ?

Answer:

Charles H. Townes

7. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.