Practice Quiz set 3 - general awareness mcq Online Quiz (set-1) For All Competitive Exams

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 They were once common, but have now largely been replaced by digital tools.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.

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.

Gottlieb Daimler invented the prototype of the modern gasoline engine in 1885. This gas engine was made with a vertical cylinder, and gasoline injected through a carburetor (patented in 1887). Daimler first built a two-wheeled vehicle the "Reitwagen" (Riding Carriage) with this engine and a year later built the world's first four-wheeled motor vehicle.

Ethology is the scientific and objective study of animal behavior, usually with a focus on behavior under natural conditions. The term was first popularized by American myrmecologist (the study of ants) William Morton Wheeler in 1902.

Nicolaus Copernicus discovered the Solar System. He was the first astronomer who formulated a comprehensive heliocentric cosmology in his book "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Celestial Spheres), which displaced the Earth from the center of the universe.

Euclid, also known as Euclid of Alexandria, was a Greek mathematician, often referred to as the “Father of Geometry”. He was active in Alexandria during the reign of Ptolemy I (323–283 BC). Euclid deduced the principles of what is now called Euclidean geometry from a small set of axioms.

Euclid also wrote works on perspective, conic sections, spherical geometry, number theory and rigour. Although many of the results in Elements originated with earlier mathematicians, one of Euclid’s accomplishments was to present them in a single, logically coherent framework, making it easy to use and easy to reference, including a system of rigorous mathematical proofs that remains the basis of mathematics 23 centuries later.

Antoine Henri Becquerel, a French physicist, was the discoverer of radioactivity along with Marie Sklodowska-Curie and Pierre Curie, for which all three won the 1903 Nobel Prize in Physics. Radioactivity refers to the particles which are emitted from nuclei as a result of nuclear instability.