scientist, discoveries & inventions MCQ section 4 MCQ Questions & Answers Detailed Explanation

Answer: (d)

In 1800, Alessandro Volta, an Italian physicist, invented the first true battery, which came to be known as the voltaic pile.

The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in brine (i.e., the electrolyte).

Answer: (c)

Answer: (d)

The electron microscope was invented by Max Knoll and Ernst Ruska in 1931 (Germany). An electron microscope uses condensing lenses to focus a beam of electrons to illuminate a specimen and produce a magnified image.

An electron microscope (EM) has greater resolving power than a light-powered optical microscope because electrons have wavelengths about 100,000 times shorter than visible light photons.

The electron microscope uses electrostatic and electromagnetic “lenses” to control the electron beam and focus it to form an image.

These lenses are analogous to but different from the glass lenses of an optical microscope that forms a magnified image by focusing light on or through the specimen.

Answer: (c)

Answer: (a)

Araneology is a branch of zoology that deals with the study of spiders. It is a branch of Arachnology, the scientific study of spiders and related animals such as scorpions, pseudo-scorpions, and harvestmen, collectively called arachnids.

Answer: (d)

Tim Berners-Lee is a British computer scientist and the inventor of the World Wide Web.

He made a proposal for an information management system in March 1989, and on 25 December 1990, with the help of Robert Cailliau and a young student at the European Organization for Nuclear Research (CERN), he implemented the first successful communication between a Hypertext Transfer Protocol (HTTP) client and server via the Internet.