Explanation

An ammeter is an instrument used to measure small electric current in a circuit.

It typically measures current in amperes (A).

It is connected in series with the circuit.

The potentiometer is used to measure emf.

A meter bridge is used to measure the electrical resistance.

Explanation

Ibn Battuta was a Maghrebi traveller, explorer, and scholar.

Over a period of 30 years from 1325 to 1354

He visited much of Africa, Asia, and the Iberian Peninsula.

His travelogue is known as "Rihla", meaning "The Journey."

Born: 24 February 1304, Tangier, Marinid sultanate

Died: 1369 (aged 64–65) Marrakesh, Marinid sultanate

Other names: The Islamic Marco Polo

Explanation

Heinrich Rudolf Hertz discovered electromagnetic waves in 1887, experimentally confirming James Clerk Maxwell's predictions.

Hertz demonstrated the existence of radio waves, a type of electromagnetic wave, using a simple apparatus.

Explanation

Explanation

 The photoelectric effect was discovered by German physicist Heinrich Rudolf Hertz in 1887

Explanation

The nucleosome was discovered by husband and wife researchers Don and Ada Olins in 1974.

First observed the "beads on a string" structure using electron microscopy

A nucleosome is the basic structural unit of DNA packaging in eukaryotes. 

Explanation

• Structure of DNA was discovered by James Watson and Francis Crick in 1953.
• They discovered the double-helix structure of DNA using X-ray crystallography data.
• Their discovery revealed the double-helix structure of DNA, where two complementary strands are twisted together with sugar and phosphate molecules, and the nitrogenous bases (adenine, thymine, cytosine, and guanine) pair in a specific manner.

Explanation

Albert Einstein, a renowned physicist, revolutionized physics with his theory of relativity.

He made significant contributions to mathematics and philosophy as well.

Einstein is celebrated as one of the most influential physicists of the 20th century.

It notably publishing four landmark papers in 1905.

Explanation

A bolometer is a device for measuring radiant heat by means of a material having a temperature-dependent electrical resistance.

Bolometer was invented in 1878 by Samuel Pierpont Langley (American astronomer)

Explanation

The human body's system of blood circulation was discovered by William Harvey.

He was an English physician.

He discovered the Circulatory System in 1628.

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