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Question Bank Calorimetry 1. Define the term heat. Ans. It is the sum total of kinetic and potential energy of all the molecules of a given substance. 2. Name the SI unit of heat. Ans. Joule (J) is the SI unit of heat. 3. Define temperature : Ans. The average kinetic energy of all the molecules of a given substance is called temperature. 4. State the SI unit of temperature. Ans. Kelvin (K) is the SI unit of temperature. 5. The temperature of a substance rises by 25 C. How much is the rise on kelvin scale and why? Ans. The rise on kelvin scale is 25 K. It is because, rise in temperature in C = rise in temperature in kelvin. 6. What is a calorimeter? Why is it made of copper? Give two reasons. Ans. A copper vessel along with copper stirrer used in the measurement of heat energy is called calorimeter. Calorimeter is made from copper because, (i) it takes the temperature of the contents within it very quickly. (ii) it has a very low specific heat capacity and hence takes very little amount of heat energy from the contents within it. Class-X 1 Question Bank
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