Question

Match the following:

Sl. No.	Scientists	Inventions
1	Michael Faraday	First battery
2	George Simon Ohm	Radioactivity
3	Volta	Dynamo
4	Henry Becquerel	Ohm’s law

Answer 1

Hint: In this question there are four different types of inventions named. Just think about the corresponding topic behind each invention. Some quantities like some laws or units are named after the great scientists who pioneered in that topic.

Complete solution:
Here, we’ll explain one by one according to the inventions.
First battery: Batteries are one of the most used electricity sources in our daily life. Before the invention of electric generators batteries served as the main source of electricity. In the year 1800 Volta invented the first true battery, later which was known as voltaic pile. He used copper and zinc as electrodes and brine as the electrolyte.

Radioactivity: Radioactivity is a spontaneous process through which an unstable atomic nucleus loses energy by emitting alpha and beta particles with gamma rays. In 1896, radioactivity was first discovered by French scientist Henry Becquerel while he was working with phosphorescent substances. There he noticed that the uranium salts were creating spots on the photographic plates despite being wrapped by black paper. That was actually happening due to radioactive decay of uranium.

Dynamo: Dynamo is the very first electrical generator which creates direct current (DC) using mechanical energy. It was first discovered in the year 1831-1832 by Michael Faraday. It works on the principle that an emf is generated within a conductor when it encircles some varying magnetic flux. Later this operating principle was known as Faraday’s law.

Ohm’s law: Ohm’s law is a very fundamental law of electrodynamics. It states that the current passing between two points of a conductor is directly proportional to the voltage difference across the two points. As the name suggests, this law was first published in 1827 by George Simon Ohm.

Final answer,

Sl. No.	Scientists	Inventions
1	Volta	First battery
2	Henry Becquerel	Radioactivity
3	Michael Faraday	Dynamo
4	George Simon Ohm	Ohm’s law

Note: Sometimes a student might get confused while matching the inventions with their inventors. But the inventor's name is always associated with something related to the invention. For this case notice that the first battery was called voltaic pile and the unit of potential difference is volt, both named after Volta. Then the SI unit of radioactivity is becquerel(Bq) named after its inventor. Dynamo principle is known as Faraday’s law and the name Ohm’s law is self-explanatory. So, for this type of question always try to find this type clue to get the correct answer.