Thermometric Substances, Calibrating Thermometers

Amidst a pandemic, clinical thermometers are frequently used to measure one’s temperature to check for a fever, which is a common symptom of viral infections.

Which of the following thermometric substances is suitable to be used in a clinical thermometer?

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The salt in seawater causes it to freeze at a lower temperature than pure water.

The seawater is seen to start freezing at the temperature marked on the thermometer shown in the diagram.

Given that the distance between the freezing point of seawater is 0.8 cm away from the ice point, what is the freezing point of seawater?

• -2°C

• -0.8°C

• 0°C

• 2°C

Bob found an old thermometer in his room.

It was still functional however, the 100°C marking had faded away.

Bob measured that the distance between 0°C and 22°C is 4.4 cm.

How far away from the 22°C mark should Bob make the new 100°C marking?

• 15.6 cm

• 17.6 cm

• 20 cm

• 22 cm

Which of the following statements is false about thermal equilibrium?

• Thermal equilibrium can be achieved by placing two objects in contact with different masses over a period of time.

• Thermal equilibrium can be achieved by placing two objects in contact with different temperatures over a period of time.

• When two objects are in thermal equilibrium, there is no longer any heat transfer between the two objects.

• When two objects are in thermal equilibrium, the two objects are of the same temperature.

A glass of water was kept in a room for a long period of time.

The water in the glass is then measured using a thermometer. The mercury level is 6 cm above the ice point.

Given that the room had a room temperature of 24°C, what is the distance between the ice point and the steam point of the thermometer?

• 24 cm

• 25 cm

• 400 cm

• cannot be determined with information provided