Exercise, 8th Sci, 14. Measurement and Effects of Heat.

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1. Write the relationship between Celsius and Fahrenheit.

2. A ... is used to measure the heat content of an object.

3. How much heat will be needed to raise the temperature of 2.5 kg of water from 25°C to 45°C? Give the answer in calories as well as in joules.

4. The temperatures in Celsius and in Fahrenheit will be the same at ...°.

5. Write true or false. We cannot determine the temperature of an object accurately by simply touching it.

6. Why does your mother put folded cloth strips soaked in cold water on your forehead when you have a high fever?

7. What will be the increase in length of a steel rod of length 0.5 m, when its

temperature is increased by 30°C? The coefficient of linear expansion of steel is 0.000013 (1/°C).

8. The length of the 18 km long Great Belt Bridge in Denmark increases by ... m in summer.

9. A huge amount of heat is produced in a very short time when the nuclei of some elements, like uranium, thorium, etc., undergo ... .

10. Which sources do we get heat from?

11. Write down examples of chemical energy sources of heat.

12. Which units are used to measure temperature?

13. Write true or false. If the average kinetic energy of atoms in two objects is equal, then their temperatures will also be equal.

14. Suppose ... amount of heat is required to increase the temperature of an object of mass m and specific heat c from Ti to Tf.

15. If the temperature of water changes by 1.5°C on giving 270 cal of heat, what is the

mass of water?

16. The unit of the expansion coefficient is the inverse of the unit of temperature, i.e., ... .

17. Why is the calorimeter made of copper?

18. How much will the temperature of 60°F be in Celsius and Kelvin?

19. How is heat transferred?

20. A ... is a device for measuring temperature.

21. Write the formula to calculate the value of the specific heat of the object.

22.  ... is the volumetric expansion coefficient of the solid.

23. The ... of an object tells us how hot or cold that object is.

24. ... unit is used in scientific experiments, while the other two units, Celsius (°C) and Fahrenheit (°F), are used in daily life.

25. The body temperature of a healthy person is ...°C.

26. A large amount of heat is present in the air around us. Write true or false.

27. The ... of an object is the amount of heat required to increase the temperature of a unit mass of that substance by one degree.

28. Draw a figure of a calorimeter.

29. ... is a form of energy. 

30. The atoms in a substance are always in ... .

31. The specific heat is represented by the symbol ‘....’.

32. At what temperature will its value be the same in Celsius and in Fahrenheit?

33. Suppose the masses of the calorimeter, the water in it, and the hot object made up of copper, which is put in the calorimeter, are the same. The initial temperature of the calorimeter and water is 25°C, and that of the hot object is 50°C. The specific heats of copper and water are 0.09 cal / (gm °C) and 1 cal / (gm °C), respectively. What will be the final temperature of the water?

34. Write the relationship between Fahrenheit and Kelvin.

35. Which effects of heat do you know?

36. The ... of a substance is related to the average kinetic energy of atoms.

37. Our sense of ‘hot’ or ‘cold’ is relative. Write true or false.

38. The higher the temperature of the solid, the faster the atoms' velocity of ... .

39. One calorie is equivalent to ... joules.

40. Calculate human body temperature in Fahrenheit.

41. When heat is given to any substance, its temperature increases and it expands.

42. The unit of specific heat in SI is ... , and in CGS it is cal/(gm °C).

43. One ... of heat is the heat required to increase the temperature of 1 gm of water by 10°C.

44. Explain how electricity is a source of heat.

45. Earlier, mercury was used in thermometers, but as it is harmful for us, it has been replaced with ... .

46. The density of a gas ... on heating.

47. True or false. The earth is also a source of heat.

48. The unit of heat in the SI system is the ... .

49. 0.000013 * 0.5 * 60 = ?

50. ... is the coefficient of areal expansion of the solid.

51. (C-32) * 5 = C * 9. C = ?

52. (90 - 32) / 9 = C / 5. Calculate C.

53. The unit of heat in the CGS system is the .... .

54. In the nuclear fusion process ... nuclei fuse together to form helium nuclei.

55. If the boiling point of water in °C is 100, then calculate it in Kelvin.

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 मीठ 

तुम्हाला माहिती आहे का भारतात सर्वात जास्त मीठ उत्पादन कुठे होते? सर्वाधिक मीठ उत्पादनामुळे, या राज्याला मीठ सम्राट म्हणून देखील ओळखले जाते. हे राज्य गुजरात आहे. देशाच्या एकूण मीठ उत्पादनापैकी, देशाच्या एकूण मीठ उत्पादनापैकी ७५ ते ८० टक्के वाटा या राज्यात आहे. कच्छ, सौराष्ट्र, भावनगर, पोरबंदर आणि सुरत या विशाल किनारी भागात पसरलेले मीठ क्षेत्र जगातील सर्वात मोठे मीठ उत्पादक पट्टा बनवते. कोरडे हवामान, तेजस्वी सूर्यप्रकाश आणि लांब किनारपट्टी यामुळे गुजरात मीठ उत्पादनासाठी आदर्श आहे.

भारताचे वार्षिक मीठ उत्पादन सुमारे ३० दशलक्ष टन असल्याचा अंदाज आहे. यापैकी एकट्या गुजरातमध्ये अंदाजे २२ ते २४ दशलक्ष टन मीठ उत्पादन होते. इतके मोठे उत्पादन केवळ देशांतर्गत गरजा पूर्ण करत नाही तर भारताला जगातील प्रमुख मीठ निर्यातदारांपैकी एक बनवते. गुजरातची ही धोरणात्मक क्षमता देशाच्या अन्न उद्योग आणि रसायन क्षेत्रासाठी कणा आहे.