Discoveries & Inventions

1.

Who discovered electron?

John Dalton

James Chadwik

Ernest Rutherford

J J Thomson

2.

Who discovered X-rays?

Paul Villard

Albert Einstein

Wilhelm Conrad Roentgen

Johann Riter

3.

Which instrument is used to measure blood pressure?

Manometer

Barometer

Sphygmomanometer

Anemometer

4.

Who is the father of cellular phone?

Linus Torvalds

Percy Lebaron Spencer

Fred Morrison

Martin Cooper

5.

Postage Meter was invented by:

Fyodor Pirotsky

Arthur Pitney

Fritz Pfleumer

Stephen Perry