Heat
Chapter 5: Heat
Top questions
See all →- Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3°C and B by 5°C. Which object has more specific heat? And by what factor? Correct answer is 5/3 https://youtu.be/vENdt48i2W4 2
- 4.A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg °C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg °C. Answer: about 20.8 °C Convert specific heats: 0.1 kcal/kg °C = 0.1 cal/g °C and 0.4 kcal/kg °C = 0.4 cal/g °C. Take the latent heat of melti... 1
- A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained? Answer: about 33 g of steam Let the mass of steam be m g. Heat gained by ice (melts at 0 °C, then warms to 50 °C): 150×80 + 150×1×50 = 12000... 1
- Liquid ammonia is used in ice factory for making ice from water. If water at 20°C is to be converted into 2 kg ice at 0°C, Answer: about 586.5 g of ammonia Heat to be removed from the water (mass 2 kg = 2000 g, specific heat 1 cal/g °C, latent heat of fusion of i... 1
- 8. Read the following paragraph and answer the questions. i. Heat is transferred from where to where? Ans: Heat is transferred from the object at higher temperature to the object at lower temperatur... 1
- d. On what basis and how will you determine whether air is saturated with vapour or not? On the basis of amount of water vapours present in the air, it can be either saturated or unsaturated. If the amount of water vapours exceed... 1