Explanation

The Wright Brothers, Orville and Wilbur, invented and flew the first successful airplane.

This historic flight took place on December 17, 1903, in Kitty Hawk, North Carolina.

Explanation

Fathometer: سمندر کی گہرائی کو جاننے والا آلہ

Galvanometer – Used to measure electric current.

Explanation

Alexander Graham Bell is often credited with being the inventor of the telephone since he was awarded the first successful patent. 

Telephone was invented in 1876.

Graham Bell made the first-ever telephone call to his partner, Thomas Watson.

agm 15.3.2023

Explanation

The British physicist Sir James Chadwick discovered neutrons in the year 1932.

He was awarded the Nobel Prize in Physics in the year 1935 for this discovery.

Explanation

Robert Brown discovered the nucleus in plant cells.

It was first described by Franz Bauer in 1804 and in more detail in 1831 by Scottish botanist Robert Brown.