1. Who invented Printing Press ?

Answer:

Johannes Gutenberg

2. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

3. Who invented HIV ?

Answer:

4. Who invented Relativity Theory ?

Answer: Einstein of Germany in 1905.

5. Who invented Transformer ?

Answer:

Ottó Bláthy

6. Who invented Nylon ?

Answer:

Wallace Carothers

7. Who invented Automatic rifle ?

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