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ICSE Class X Notes 2025 : Physics (Mercy Memorial School (MMS), Kanpur) : practice self-test

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Dmranjan Kumar
Mercy Memorial School (MMS), Kanpur
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Calorimetry 1. Define the following terms one calorie, heat capacity, specific heat capacity. 2. State of the principle of calorimetry 3. Define Latent heat and Specific latent heat. 4. Why does the temperature of the surroundings start falling when the ice of a frozen lake starts melting? 5. i) In winter, the weather forecast for a certain day was severe frost . A wise farmer watered his fields the night before to prevent frost damage to his crops. Why did he water his fields? 0 ii) 10125 J of heat energy is supplied to 4.5g of water at 100 C to convert it into steam. Find the specific latent heat of steam. 6. 0 0 Which of the two, 1g of ice at 0 C or 1g of water at 0 C, contains more heat? 7. 1 calorie = _? 8. Why does the temperature of the earth does not becomes very low at night? 9. State the assumption when --- Heat lost = Heat gained. 10. Water falls from a height of 50m. Calculate the rise in the temperature of water when it strikes the ground. (g = 10m/s2; Specific heat capacity of water = 4200 J/kg0C) 11. Explain : (a) Name the SI unit of heat. How is this unit related to calorie? (b) The heat capacity of a body of mass 0.05 kg is 62.5 J C 1. (i) How much heat energy is required to raise its temperature through 20 C? (ii) What is its specific heat capacity in SI unit? 12. (a) What is a calorimeter? Why is it made of copper? Give two reasons. (b) An electric heater of power 1000 W raises the temperature of 5 kg of a liquid from 25 C to 31 C in 2 minutes. Calculate (i) Heat capacity of liquid. (ii) Specific heat capacity of liquid. 13. (a) Explain, why sandy soils get heated up quickly as compared to wet soils? (b) When 200 g of hot water at 80 C is added to 400 g of cold water, when the temperature of cold water rises by 18 C. Calculate the initial temp. of cold water. 14. (a) Specific heat capacity of a material is 400 Jkg 1K 1. What do you understand by the statement? (b) A copper calorimeter weighing 46.5 g contains 80 g of water at 23 C. 60.0 g of sand at 90 C is poured into the calorimeter and stirred gently. The final temperature recorded is 30 C. Calculate sp. heat capacity of sand. [sp. heat capacity of copper is 0.4 Jg 1 C 1 and that of water is 4.2 Jg 1 C 1]

 

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