Tag: science & technology

Fe is the chemical symbol for iron, derived from its Latin name 'ferrum.' This naming convention follows the pattern where many element symbols come from their Latin names (e.g., Na for sodium from 'natrium,' Au for gold from 'aurum'). Ir is iridium, Zn is zinc, and Tn is not a valid chemical symbol.

Speed is defined as the distance traveled per unit of time. Average speed specifically is total distance divided by total time taken. Work is force times distance, acceleration is rate of change of velocity, and force is mass times acceleration.

Mercury orbits closest to the Sun, so from Earth's perspective it never appears far from the Sun. It's only visible shortly before sunrise or shortly after sunset, earning it the names 'morning star' and 'evening star.'

James Watt did invent the steam engine, Alexander Graham Bell invented the telephone, and John Logie Baird invented the television. However, penicillin was discovered by Alexander Fleming, not J. Perkins (Perkins is associated with an early refrigeration technique).

Troy weight is a traditional system of mass measurement specifically used for precious metals like gold, silver, and platinum. It differs from the standard avoirdupois weight used for most other goods. Liquids use volume measures, fossil fuels use standard weight or volume, and medicines use metric mass or volume.

Charles Darwin did propose the theory of evolution by natural selection. However, the typewriter is associated with Sholes (Remington manufactured it), dynamite was invented by Nobel (Dunlop invented pneumatic tires), and the airplane was invented by the Wright brothers (not Harway).

Silver has the highest electrical conductivity of all metals, even higher than copper. However, copper is more commonly used in wiring because it's much cheaper and only slightly less conductive. Aluminium is used for power lines due to its light weight despite lower conductivity, while nickel has relatively poor conductivity.

A solar cell converts light directly into electricity through the photovoltaic effect, with no combustion involved. Internal combustion engines (jet engines, car motors, and diesel engines) all burn fuel inside the engine to produce mechanical energy through expanding gases.

László Bíró, a Hungarian journalist, invented the modern ballpoint pen in the 1930s. The key innovation was a tiny ball that rolled to distribute ink as it moved across paper. Waterman is associated with fountain pens, while Oscar and Wilson are not associated with pen inventions.

Blaise Pascal invented the Pascaline, an early mechanical calculator in the 17th century. The other options - modern computers, cinema, and 'none of these' - are incorrect associations.