Question

Detine I calorie,
On what factors does the heat required for rise in temperature of a body depend?
. What does it mean when we say specific heat capacity of iron is 450 J/kg"C?
1. What is the principle of calorimetry?
5. Why does temperature remain constant during change of state?
Yumericals
1. 5000 cal of heat is supplied to 11 of water. Find the rise in temperature of water. Given specific
heat capacity of water = 1 cal/g °C. Density of water = 1 g/cc.
2. Calculate the specific latent heat of a substance if 8000 J of heat is required for melting 25 g of
substance.
3. Calculate the energy required to melt 2 kg of ice. Given specific latent heat of fusion of ice is
336 x 10'J/kg.
4. An iron rod at 80°C of mass 0.8 kg is dropped into 1 kg of water at 20°C. What will be the final
temperature of rod and water in equilibrium?
5. 51 of water at 60°C is mixed with 25 l of water at 20°C. What is the final temperature of water?
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Answer 1

Answer: (i) Calorie: It is the quantity of heat required to raise the temperature of 1 gm of water by 1°C (more accurately the rise in temperature is taken from 14.5°C to 15.5°C). ... Answer: Heat capacity of a body = Mass of the body × Specific heat capacity of its substance.