Question

Name the device which is used to measure temperature.
(A) Calorimeter
(B) Thermometer
(C) Vernier Calliper
(D) None

Answer 1

Hint: Temperature is a physical quantity that expresses hot and cold. It can also be called as the measure of thermal energy a body possesses. Temperature is important in all forms of science and technology ranging from mechanics to medical science. Measuring the temperature is hence important.

Complete Step by Step answer:
Temperature is nothing but the measure and degree of hotness or coldness a body experiences. We are quite familiar with the temperature being told like the melting point of an element, or our own body temperature. Although we could suggest the hotness or coldness of a body relatively by comparing it with another body, it is impossible to say the exact magnitude of temperature the body has without an instrument to measure. It is usually represented in the units of $^\circ C$ (Celsius), or $^\circ F$ (Fahrenheit), but the SI unit used is Kelvin $(K)$ .
So, the instrument thus used to measure temperature is called a thermometer. Although there are different kinds of thermometer used in each different sector based on their need, the most common among them is the clinical bulb thermometer. The working of these devices is pretty much the same. They used the property of expansion of liquids that expands on getting in contact with heat.
Out of the options we have,
$ \Rightarrow $ Calorimeter is a device used to measure the amount of heat of chemical reactions or physical changes. That is, they measure the energy and not the temperature.
$ \Rightarrow $ A Thermometer is used to measure the temperature.
$ \Rightarrow $ A vernier calliper is used to measure the width and accurate length of objects.

Thus, the device used to measure temperature is the thermometer. Hence the correct answer will be option B.

Note:
There might be a confusion regarding a calorimeter, temperature is measured in $^\circ C$ whereas calorimeter measures the amount of heat released and provides values in $J/^\circ C$ which is why they are not the device used to measure temperature. In fact, a basic calorimeter has a thermometer attached to its apparatus.