Explanation

Ernest Rutherford showed (1919) that nitrogen under alpha-particle bombardment ejects what appear to be hydrogen nuclei.

By 1920 Ernest Rutherford had accepted the hydrogen nucleus as an elementary particle, naming it proton.

while

Electron was discovered by J. J. Thomson in 1897.

Explanation

The Wright brothers completed the world's first successful controlled powered flight in 1903

The Wright brothers name are: Orville Wright and Wilbur Wright

They were American inventors and aviation pioneers.

Explanation

• Inventor: Laszlo Biro
• Nationality: Hungarian-Argentine.
• Invented: 1938.
• Purpose: Smoother writing than fountain pens

Last updated by NA on 05-11-2026

Explanation

Guglielmo Marconi was an Italian inventor and electrical engineer who is credited with the invention of the radio.

His work on long-distance radio transmission and the development of Marconi's law revolutionized wireless communication in the early 20th century.

Explanation

Casimir Funk discovered Vitamins in the year 1912.

Explanation

Explanation

The entity specifically trained and responsible for discarding explosive material is the Bomb Disposal Squad

It is also known as Explosive Ordnance Disposal (EOD) units.

Explanation

Modern technological "sniffers" trained detection dogs are still considered the most effective and versatile method for detecting explosives or gunpowder.

Dogs offer a unique combination of olfactory sensitivity, mobility, and adaptability to various environments and evolving threats. 

Explanation

In 1796, Edward Jenner successfully used material from cowpox to vaccinate against smallpox.

This was the first successful vaccination in medical history.

Explanation

A seismograph is an instrument used to detect and record earthquakes.

It consists of a mass attached to a fixed base

During an earthquake, the base moves and the mass does not.