Science MCQ (1 Marks)

A clinical thermometer reads temperature from $35^\circ C$ to $42^\circ C.$

Trapped (still) air is good insulator.
Thermal conductivity of air is small as compared to solid and liquid. Eg- glass conducts $30$ times more power per unit distance per unit temperature than air.
The less dense the material, the less thermal conductivity. And gas (air) is least dense than solid and liquid.

Thermo flask is a special kind of flask for keeping liquids. It prevents loss or gain of heat by any of the three methods. It keeps liquid warm or cold for a long time. It was invented by Sir James Dewar in $1893.$ He was a Scottish chemist and physicist.

We know that metals are good conductors of heat and electricity. Generally, in cooking utensils are made of metals because they are good conductors of heat. Here, option $[C]$ is best suitable for this question.

Conduction occurs when two objects at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules. This process continues until heat energy from the warmer object spreads throughout the cooler object, like the heat from the milk spreading throughout the metal spoon dipped in it. Hence, option $[A]$ is correct.

 The clinical thermometer is a specially designed thermometer to measure body temperature.
The range of a clinical thermometer is centered around the human body temperature which is from $35^\circ C$ to $42^\circ C.$

 Hint: It is on the name of one a physicist.
Solution: Step $1:$ Finding $SI$ unit of temperature:
One of the seven SI base units, the kelvin is the $SI$ unit of thermodynamic temperature. Unlike the rest of the $SI,$ the degree Celsius $(^\circ C)$ is a separate unit of temperature.