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

Answer: (d)

An optical fibre (or optical fibre) is a flexible, transparent fibre made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or “light pipe”, to transmit light between the two ends of the fibre.

The field of applied science and engineering concerned with the design and application of optical fibres is known as fibre optics. Optical fibres are widely used in fibre-optic communications, which permits transmission over longer distances and at higher bandwidths (data rates) than other forms of communication.

Narinder Singh Kapany is an Indian born American physicist who invented optical fibre.

Answer: (a)

Polystyrene is a synthetic aromatic polymer made from monomer styrene. It is non-biodegradable, i.e., it cannot be decomposed by bacteria or other living organisms.

It was discovered in 1839 by Eduard Simon. Polystyrene is one of the most widely used plastics used in protective packaging (CD and DVD cases), containers, lids, bottles, trays, disposable cutlery.

Answer: (b)

Lux meters, also known as light meters, measure the intensity of light as perceived by the human eye with the help of photo detectors.The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. In photometry, it is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.

Answer: (b)

Wallace Hume Carothers was an American chemist, inventor and the leader of organic chemistry at DuPont, credited with the invention of nylon. He was a group leader at the DuPont Experimental Station laboratory, near Wilmington, Delaware, where most polymer research was done.

Answer: (a)

Answer: (a)

The Wright brothers, Orville and Wilbur, were two American brothers, who are credited with inventing and building the world’s first successful airplane on December 17, 1903. From 1905 to 1907, the brothers developed their flying machine into the first practical fixed-wing aircraft.