CONCEPTUAL PROBLEMS

1. A student claimed that thermometers are useless because a thermometer always registers its own temperature. How would you respond?
2. Define absolute temperature
3. Why mercury is used in thermometer?
4. Which physical quantity determines the direction of flow of heat?
5. What are the differences between heat and temperature?
6. Define temperature on the basis of Zeroth law of thermodynamics.

7. State and explain Zeroth law of thermodynamics.
8. Explain about different temperature scales.

NUMERICAL PROBLEMS

1. A centigrade thermometer reads 1^oC at the melting point of ice and 99^oC at the boiling point of water at normal pressure. What is the correct temperature when it reads 25^oC? Ans: 24.5^oC
2. Express 98^oF into Kelvin scale.
3. At what temperature will the Celsius scale reading double the Fahrenheit reading?
4. At what temperature, do the Fahrenheit-thermometer and Celsius-thermometer show the same reading?
5. At what point of thermometric scale does kelvin scale reading coincide with Fahrenheit scale reading?
6. A faulty Fahrenheit thermometer shows a temperature of 206^oC when immersed in boiling water. When a correct Celsius thermometer is dipped in the same water it records 96^oC. Find the correction to be applied to the faulty thermometer when it records 206^oF? Ans: – 1.2^oF
7. What is the change in Fahrenheit scale when the temperature change in Centigrade scale is 12.5? Ans: 22.5^oF