(9 phy chap 9)
Short Questions (120)
Easy Questions (30%)
1. What is heat transfer?
2. Name the three modes of heat transfer.
3. Define conduction.
4. What is thermal conduction?
5. What are good conductors of heat?
6. Name two examples of good conductors.
7. What are insulators?
8. Name two examples of insulators.
9. How does heat transfer occur in solids?
10. Define convection.
11. What are convection currents?
12. Where does convection occur?
13. Name two examples of convection in liquids.
14. What is sea breeze?
15. What is land breeze?
16. Define radiation.
17. How does radiation differ from conduction and convection?
18. What is the greenhouse effect?
19. Name a common greenhouse gas.
20. What is the role of the sun in heat transfer?
21. What is the effect of temperature difference on heat transfer?
22. How does heat transfer occur through radiation?
23. What are the consequences of the greenhouse effect?
24. Define thermal conductivity.
25. What factors affect thermal conduction in solids?
26. How does the cross-sectional area of a solid affect heat transfer?
27. What is the unit of thermal conductivity?
28. What are the consequences of using poor thermal conductors?
29. How is conduction used in cooking?
30. What is the difference between conductors and insulators?
31. How does convection help in heating water?
32. What is the main use of convection currents in everyday life?
33. How does radiation transfer heat through a vacuum?
34. Why is metal a good conductor of heat?
35. What is meant by thermal resistance?
Moderate Questions (40%)
36. Explain how heat transfer occurs through conduction.
37. What factors affect the rate of conduction in solids?
38. How does the length of a solid affect its thermal conductivity?
39. Discuss the importance of cross-sectional area in heat conduction.
40. What are the practical applications of conductors and insulators in daily life?
41. Explain the process of heat transfer through convection.
42. What causes convection currents in air?
43. How do convection currents contribute to the formation of wind?
44. What is the difference between sea breeze and land breeze?
45. Discuss the role of convection in the heating of liquids.
46. Explain the process of heat transfer through radiation.
47. How does the color of a surface affect radiation?
48. What are some applications of radiation in everyday life?
49. What is the greenhouse effect and how does it impact the environment?
50. How does the greenhouse effect contribute to global warming?
51. What are the primary greenhouse gases?
52. How does heat transfer occur between objects of different temperatures?
53. What is the significance of thermal equilibrium?
54. Explain the use of insulators in preventing heat loss.
55. How do thermal conductors affect heat transfer in buildings?
56. What is the relationship between thermal conductivity and insulation?
57. Explain how heat transfer through conduction can be reduced.
58. Describe the role of convection in the heating of the atmosphere.
59. What are the factors that affect the rate of convection?
60. Discuss the role of conduction, convection, and radiation in heat transfer.
61. What are the effects of heat transfer on different states of matter?
62. How does temperature difference between the ends of a solid affect heat transfer?
63. Explain the concept of thermal resistance in heat transfer.
64. How does the length of a solid affect its thermal resistance?
65. Explain why metals are better conductors of heat than non-metals.
66. What is the role of free electrons in thermal conduction?
67. How does heat transfer occur in gases?
68. Discuss the role of radiation in the transfer of heat from the sun to the earth.
69. What is the effect of the greenhouse effect on global temperatures?
70. How does radiation differ from other forms of heat transfer?
71. What are the consequences of radiation on living organisms?
72. Explain the use of radiation in heat-sensitive devices.
73. How does the greenhouse effect affect the earth’s climate?
74. Explain how conduction, convection, and radiation contribute to weather patterns.
75. What is the relationship between temperature and heat transfer?
76. How does thermal conductivity change with temperature?
77. Discuss the role of different materials in heat transfer.
78. How do convection currents contribute to ocean currents?
79. What is the importance of thermal conductivity in cooking?
80. How does the structure of a material affect its thermal properties?
81. Explain the use of convection in heating systems.
82. What is the role of radiation in cooling systems?
83. How does the thickness of a material affect its thermal resistance?
84. Discuss the role of the atmosphere in protecting the earth from excessive radiation.
85. How does the greenhouse effect influence global weather patterns?
86. How does the absorption of radiation affect the temperature of a body?
87. Explain the effect of surface texture on radiation.
88. How do convection currents affect the climate of coastal areas?
89. Explain the role of greenhouse gases in trapping heat.
90. What are the effects of the greenhouse effect on polar ice caps?
91. How does heat transfer affect the density of air?
92. How does thermal conduction occur at the molecular level?
93. What is the role of radiation in the heating of the earth’s surface?
94. Discuss the effect of heat transfer on the physical properties of materials.
95. How does the type of material affect its thermal expansion?
Tough Questions (30%)
96. Explain how conduction, convection, and radiation work together in the heating of the earth’s atmosphere.
97. Derive the formula for thermal conductivity.
98. Discuss the role of free electrons in the thermal conductivity of metals.
99. How does the structure of insulators prevent heat transfer?
100. Explain the role of thermal resistance in building design.
101. Describe the effect of the greenhouse effect on weather patterns.
102. Discuss the impact of thermal conduction on energy efficiency.
103. Explain how convection currents contribute to the distribution of heat in the atmosphere.
104. What is the relationship between thermal conductivity and heat transfer?
105. Discuss the effect of radiation on the thermal properties of materials.
106. Explain the use of radiation in industrial applications.
107. How does the length and cross-sectional area of a conductor affect its thermal properties?
108. Explain the role of convection currents in the transfer of heat in liquids and gases.
109. Discuss the impact of the greenhouse effect on sea levels.
110. Explain how different materials respond to heat transfer through radiation.
111. What is the role of thermal conductivity in the design of cooking appliances?
112. Discuss the relationship between heat transfer and phase changes.
113. How does the greenhouse effect contribute to climate change?
114. Explain the relationship between thermal conductivity and temperature gradients.
115. Discuss the role of radiation in the transfer of heat in space.
116. How does the nature of a surface affect its thermal radiation?
117. What is the role of conduction, convection, and radiation in global energy transfer?
118. How does the greenhouse effect contribute to the melting of glaciers?
119. Explain the role of thermal properties in the design of thermal insulation systems.
120. Discuss the role of conduction and convection in weather phenomena.
Long Questions (10)
Easy Questions (3)
1. Define conduction, convection, and radiation. Explain each mode of heat transfer with examples and discuss the differences between them.
2. What is the greenhouse effect? Describe its causes and consequences. Discuss the role of greenhouse gases in trapping heat.
3. Explain the concept of thermal conductivity. Describe the factors affecting thermal conductivity in solids, liquids, and gases.
Moderate Questions (4)
4. Discuss the role of conduction, convection, and radiation in the heating and cooling of buildings. Explain how thermal properties are used in designing energy-efficient buildings.
5. Explain how convection currents are formed. Describe their role in the formation of sea breeze and land breeze with diagrams.
6. Describe the process of heat transfer through radiation. Explain the effects of radiation on the environment and discuss its applications in daily life.
7. What is the significance of thermal resistance in heat transfer? Explain how thermal resistance affects the rate of heat transfer in materials.
Tough Questions (3)
8. Derive the formula for heat transfer through conduction. Discuss the factors affecting the rate of conduction in different materials.
9. Explain the impact of the greenhouse effect on global weather patterns. Discuss the relationship between greenhouse gases and global warming.
10. Explain the role of thermal conductivity, thermal resistance, and radiation in heat transfer. Discuss how these concepts are used in designing industrial and household heating systems.