scientist, discoveries & inventions MCQ section 3 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Voice-mail (also known as voicemail, voice message or voice bank) is a computer-based system that allows users and subscribers to exchange personal voice messages; to select and deliver voice information; and to process transactions relating to individuals, organizations, products and services, using an ordinary telephone.

Voicemail systems were developed in the late 70’s by Voice Message Exchange (VMX). They became popular in the early 80’s when they were made available on PC-based boards.

Voice mail was the brainchild of Gordon Mathews, a successful entrepreneur who held 35 US and foreign patents at the time of his death on February 23, 2002.

Answer: (b)

Answer: (c)

Alexander Fleming was a Scottish biologist, pharmacologist and botanist. His best-known discoveries are the enzyme lysozyme in 1923 and the antibiotic substance penicillin from the mould Penicillium notatum in 1928, for which he shared the Nobel Prize in Physiology or Medicine in 1945 with Howard Florey and Ernst Boris Chain.

Answer: (b)

Ecology is defined as the study of the patterns and processes governing the abundance and distribution of organisms and their relationships to their environment. It is the science that deals with the inter-relationship between the various organisms living in an area and their relationship with physical environment.

Answer: (a)

Answer: (b)

The Wright brothers, Orville and Wilbur, were two American brothers, inventors, and aviation pioneers who were credited with inventing and building the world's first successful aeroplane and making the first controlled, powered and sustained heavier-than-air human flight, on December 17, 1903.

In the two years afterwards, the brothers developed their flying machine into the first practical fixed-wing aircraft.