1. Who invented Printing Press ?

Answer:

Johannes Gutenberg

2. Who invented Nylon ?

Answer:

Wallace Carothers

3. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

4. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.

5. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

6. Who invented Automatic rifle ?

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

7. Who invented Transformer ?

Answer:

Ottó Bláthy