Explanation

Lactometer is used for milk

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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.

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Explanation

Perseverance landed on Feb. 18, 2021.

 is a car-sized Mars rover designed to explore the Jezero crater on Mars as part of NASA's Mars 2020 mission.

It was manufactured by the Jet Propulsion Laboratory and launched on July 30, 2020

As of 23 July 2023, Perseverance has been active on Mars for 861 sols.

Explanation

Aristotle is widely considered the founder of meteorology.

He first used the term "meteorology" in the fourth century BC, although his work on weather was based on observation and lore rather than modern scientific methods.

Explanation

Isaac Newton formulated the law of universal gravitation, explaining how gravity works.

He famously described gravity after observing an apple fall from a tree.

Explanation

In the year 1913, Niels Bohr proposed an atomic structure model,

describing an atom as a small, positively charged nucleus

Explanation

John Napier introduced the concept of Logarithms in the 17th century

John Napier invented the logarithm in 1614

Edinburgh-born Renaissance scholar John Napier invented logarithms

His purpose was to assist in the multiplication of quantities that were then called sines

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Explanation

In late 1940, before the U.S. entered World War II and just after earning his doctorate, Drew was recruited by John Scudder to help set up and administer an early prototype program for blood storage and preservation

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Explanation

Hippocrates was a Greek physician.

Hippocrates is called the "Father of Modern Medicine" for his systematic approach to clinical medicine.

He emphasized observation, diagnosis, and ethics, laying the foundation for modern medical practice.

Explanation

Explanation

Joseph Priestly discovered oxygen on August 1, 1774.

The most abundant element in the Earth's crust is oxygen, making up 46.6% of Earth's mass