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

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: (b)

Alexander Graham Bell, an eminent Scottish-born scientist, is credited with inventing the first practical telephone in 1876. Among one of his first innovations after the telephone was the “photophone,” a device that enabled sound to be transmitted on a beam of light.

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)

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.

Answer: (b)

Selman Waksman was awarded the Nobel Prize in 1952 “for his discovery of streptomycin, the first antibiotic effective against tuberculosis.” He was called “one of the greatest benefactors to mankind,” as the result of the discovery of streptomycin. Waksman was a Russian-born, Jewish-American inventor, biochemist and microbiologist.

Answer: (a)

A planimeter, also known as a platometer, is a measuring instrument used to determine the area of an arbitrary two-dimensional shape. They were once common, but have now largely been replaced by digital tools. The Swiss mathematician Jakob AmslerLaffon built the first modern planimeter in 1854.