Name the first Indian to became the Chief of Air staff.

Who developed 'Rocket(an improved version of the earliar steamp engine)

Where did block printing was first invented ?

Who built the first passenger train ?

The original method of printing was

Inventor of the first rocket which burnt on liquid fuel.

When did the first passenger train build?

When did colour television demonstrate?

Johannes Gatenberg was a German _________

A machine tool or system that someone has newly made, designed or thout of for the first time is known as____________.