Explanation

Lactometer is used for milk

**

A lactometer is an instrument that is used to check for the purity of milk by measuring its density.

 lactometer works on the principle of gravity of milk.

***

Explanation

Mark Zuckerberg is known for co-founding Facebook.

He belongs to the USA. 

Facebook founded February 4, 2004.

Explanation

Ronald Ross was a medical doctor who received the Nobel Prize for Physiology or Medicine in 1902 for his work on the transmission of malaria.

He belonged to the British.

Explanation

James Watt, a Scottish engineer, patented improvements to the steam engine in 1781.

He significantly enhancing its efficiency and power, and revolutionizing industry and transportation.

Explanation

Charles Darwin is often credited with "discovering" evolution.

He wrote about evolution from 1748 to 1859

It was the year when he published On the Origin of Species.

Explanation

Herodotus was a Greek writer who invented the field of study known today as `history'.

Born: Halicarnassus, Türkiye

Died: Thurii, Italy

Explanation

The mercury barometer is the oldest type of barometer.

It was invented by the Italian physicist Evangelista Torricelli in 1643.

Explanation

A biconvex lens is the type of lens found in the human eye,

and it is responsible for forming genuine images

The lens, or crystalline lens, is a transparent biconvex

structure in most land vertebrate eyes (We are all vertebrates)

***

The image formed at the retina of the human eye is real and inverted.

ND-8-08-2023

Explanation

An anemometer is an instrument that measures wind speed.

This type of anemometer has a spinning wheel.

Additional Information:

A hygrometer is an instrument used to measure humidity

A salinometer is used to measure the salinity

A bolometer is used to measure the power of incident electromagnetic radiation

A barometer is used to measure air pressure in certain environment.

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.