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

Answer: (c)

When Card David Anderson discovered a new particle with a mass between that of the electron and proton, he named it 'mesoton' in a 1933 publication in the Physical Review.

However, on the advice of Professor R.A. Millikan, he changed the name to ‘mesotron’ although he (Anderson) did not agree with it.

Homi Jehangir Bhabha then sent a short paper to Nature journal in February 1939 in which he proposed the name meson. The name given by Bhabha has remained to this day and is used for a class of elementary particles.

Answer: (b)

The instrument used to measure electrical current is called an ammeter, which is actually a shortened form of ‘amp meter’. The current is measured in amperes. In scientific labs, a much more sensitive instrument called a galvanometer is used to measure very small currents.

Answer: (b)

Otto Hahn, (8 March 1879 – 28 July 1968) was a German chemist and Nobel laureate, a pioneer in the fields of radioactivity and radiochemistry.

He is regarded as “the father of nuclear chemistry”. Hahn was a courageous opposer of Jewish persecution by the Nazi Party and after World War II he became a passionate campaigner against the use of nuclear energy as a weapon.

He served as the last President of the Kaiser Wilhelm Society (KWG) in 1946 and as the founding President of the Max Planck Society (MPG) from 1948 to 1960. He is famous for the invention of the atomic bomb.

Answer: (d)

Answer: (b)

World Wide Web (www) was invented by English scientist Tim Berners-Lee in 1989. It is an information space where documents and other web resources are identified by URLs, interlinked by hypertext links, and can be accessed via the Internet.

Answer: (d)

A videotape is a recording of images and sounds onto magnetic tape as opposed to film stock used in filmmaking or random access digital media. Videotapes are also used for storing scientific or medical data, such as the data produced by an electrocardiogram.

Charles P. Ginsburg invented the videotape. He worked for Ampex and was inspired by the reel-to-reel machines used for recording sound.