see 2080 model questions science (chapter: Heat)

 A. Define the terms:-

1. Heat                     2. Temperature              3. Thermometer        4. Calorimeter     5. One Calorie

6. One Joule    7. Anomalous Expansion of water     8. Specific Heat Capacity    

9. Thermometer   10. Sea breeze      11. Land breeze    12. Thermal Energy 

B. General questions:-

  1. On what factors heat depends? What is the relation of heat with its factors?
  2. Give the concept of heat and temperature on the basis of molecular motion.
  3. On what factors temperature depends on? What is the relation of temperature with its factors?
  4. What are the effects of heat?
  5. What is the cause of anomalous expansion of water?
  6. What are the advantages of anomalous expansion of water?
  7. What is meant by specific heat capacity of water is 4200 J/kg oC?
  8. How much Joule is there in 1 calorie? 
  9. At what temperature the density of water us maximum?
  10. What is anomalous expansion of water? Write the formula of heat equation.
  11. Write the relation between mass of an object and heat gained by it.
  12. What effect will be seen on the density and the volume of water when it is heated from oC to 10oC? What is this type of behavior of water called? How this behavior of water is useful for aquatic life?
  13. Mention any two factors on which the quality of heat lost or gained by an object depends. Also write the relation of these factors with heat lost or gained by the object.
  14. The specific heat capacity if mercury is 138J/kgoC, what does it mean?
  15. Name the instrument which is made on the basis of expansion of heat.
  16. What is thermometric substance? Give one example.
  17. At what temperature the oC and oF coincide?
  18. What is the relation of temperature and expansion of liquid?
  19. What is the relationship between heat loss or gain by a body with amount of substance, specific heat capacity and increase or decrease of temperature?
  20. What is the relation of heat loss or gain with the mass of the substance?
  21. What is the relation of heat loss or heat gain with the temperature of the substance?
  22. What do you mean by specific heat capacity is 470 J/kg oC?
  23. If an object of same mass, shape, size and at 100 oC are kept over a wax slap, which of them will melt the wax for the maximum depth? 

C. Give reason:-

  1. The heat changes the states of body, why?
  2. When gases state of a body is cooled it changes in to liquid , further cooling it changes in to solid, why?
  3. Different quantity of same object can have same temperature but different heat energy, Why?
  4. Why does heat cause the expansion of volume of a body?
  5. Small gap is kept between the two railway tracks, why?
  6. Electric wires are sagging during summer season, why?
  7. Why heat causes the change in solubility?
  8. Ghee gets solidify from bottom but water get solidify from the top, why?
  9. A beaker fully filled with water 4oC over flows on heating and cooling, why?
  10. Aquatic animals can survive at the bottom although pound is covered with ice, why?
  11. Why the glass gets crack when boiling water is poured in it?
  12. Why the glasses of window break down in summer season?
  13. Why the lid of bottle is dipped into hot water go open the tight lid?
  14. why the glass of window break down in winter season?
  15. Wearing two shirts in warmer than single jacket, why?
  16. Newly built quilt is warmer then older one, why?
  17. Water in earth pots remains cool in summer days, why?
  18. Water is used to cool the engine, why?
  19. Days in desert are vary hot and nights are vary cold, why?
  20. Temperature of a small island remains same throughout the year, why?
  21. A fully filled bottle is kept in refrigerator to freeze, why?
  22. Water is used hot water bag rather than oil, why?
  23. Why does milk boil faster than water?
  24. Why, wet clothes are kept at the forehead of a person suffering from fever?
  25. Two different metal balls of equal mass of different specific heat capacity are given equal heat energy which of them gets heated more and why?
  26. Two metal balls which different specific heat capacity and equal mass are heated up to 200 oC which of them needs more heat and why?
  27. A metal chair is felt cooler than a wooden chair during winter, why?
  28. When we get out of a bed in the very cold morning we fell the room cold but when we come back staying some time outside, we feel the air of room warmer, why?

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