scientist, discoveries & inventions MCQ section 3 Practice Questions Answers Test with Solutions & More Shortcuts

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)

Arboriculture is the cultivation, management, and study of individual trees, shrubs, vines, vegetables and other perennial woody plants.

It is primarily focused on individual woody plants and trees maintained for permanent landscape and amenity purposes, usually in gardens, parks or other populated settings, by arborists, for the enjoyment, protection, and benefit of human beings.

It falls under the general umbrella of horticulture.

Answer: (c)