Question

The first thermometer was developed by:
$
  (a){\text{ Joule}} \\
  (b){\text{ Fahrenheit}} \\
  (c){\text{ Galileo}} \\
  (d){\text{ Watt}} \\
 $

Answer 1

Hint – There are many people who claim to be the inventor of thermometers like Santorio Santorio, Galileo, Thomas Allbut, so there can be multiple rights as well but search for the option according to the choices being given.

Complete step-by-step answer:
The first real medical thermometer was invented by Sir Thomas Allbut in 1867. It was six inches long and took about five minutes to take a person's temperature. For almost a hundred years’ thermometers were basically unchanged. They contained alcohol or mercury and were considered to be very accurate.
But, Galileo Galilei is often claimed to be the inventor of the thermometer. However, the instrument he invented could not strictly be called a thermometer: to be a thermometer an instrument must measure temperature differences; Galileo's instrument did not do this, but merely indicated temperature differences. His instrument should rightly be called a thermoscope.
The thermoscope –
The predecessor to the thermometer, the thermoscope is a thermometer without a scale; it indicates differences in temperature only i.e. it can show if the temperature is higher, lower or the same, but unlike a thermometer it cannot measure the difference nor can the result be recorded for future reference. The thermoscope was widely used by a group of scientists in Venice that included Galileo. It was only a small step from the thermoscope to the thermometer.
So according to options option (C) is correct.

Note – A thermometer is a device that measures temperature or a temperature gradient (the degree of hotness or coldness of an object). A liquid thermometer is based upon the principle of thermal expansion.