 |
| Physics 9th Chapter 9 Transfer of Heat Questions Bank |
Physics 9th Chapter 9 Transfer of Heat MCQs
Choose the right answer
1. All the bodies expand on heating:
2. Black surfaces are:
3. Boiling point of water in Fahrenheit is:
4. Cause of land and sea breeze is:
5. Celsius equivalent of OK is:
6. Climate of regions near sea shore remains moderate due to:
7. Coloured surfaces are:
8. Fahrenheit equivalent of OK is:
9. Feathers of the birds are:
10. Geysers work on the principle of:
11. Global warming in the world is due to:
12. Heat from sun reaches us by:
13. Heat is a type of energy:
14. Human normal body temperature of 37°C in Fahrenheit is:
15. Ice is a (an):
16. Land and sea breezes are due to:
17. Latent heat of fusion of ice is:
18. Latent heat of vaporization of water is:
19. Linear expansion depends on:
20. Linear expansion of a rod occur along ----- dimension (s):
21. Methods of transmission of heat are:
22. Quantity of heat that changes one kilogram of a of liquid into gas is called:
23. Quantity of heat that changes one kilogram of a of solid into liquid is called:
24. Shinning silvered surfaces are:
25. SI unit of Coefficient of linear & volume expansion is:
26. Specific heat of water is:
27. Styrofoam is a:
28. Temperature is the:
29. Temperature of 30 °C in Fahrenheit is:
30. The characteristic of unequal expansion of different metals is employed in a device known as:
31. The device used to measure of the specific heat of an object is:
32. The gases in the Earth’s atmosphere, which causes the greenhouse effect:
33. The liquid used in thermometers is (are):
34. The quantity of heat that causes 1K change in temperature in a substance of mass 1 Kg is called:
35. The SI unit of temperature is:
36. The thermal conductivity of Aluminum is:
37. The thermal conductivity of brick is:
38. The thermal conductivity of copper is:
39. The thermal conductivity of glass is:
40. There are ----- type of expansion take place in a liquid filled in a container:
41. Thermostat is used in:
42. Thermostat works on the principle of:
43. Transfer of heat by the actual movement of molecules:
44. Transmission of heat by waves without affecting medium on its way:
45. Transmission of heat from one body to another body by the interaction of atoms and electrons:
46. Unit of latent heat is:
47. Unit of specific heat is:
48. Unit of thermal conductivity is:
49. Ventilation in our houses is only possible due to:
50. Volume expansion depends on:
51. Water is a:
52. Which of the following has highest specific heat?
53. Which of the following is best for insulation?
54. Which one is (are) the insulator (s)?
55. β =
Short Questions
1. Define conduction.
2. Define convection with examples?
3. Define Greenhouse Effect.
4. Define Radiation.
5. Define rate of flow of heat write its formula and unit
6. Define thermal conductivity write its formula and unit.
7. Define thermals and thermal climbers.
8. Define transfer of heat write its methods?
9. Describe convection in water heating by putting a few pinky crystals in round bottom flask.
10. Explain convection in sweater to support marine life.
11. Explain how the birds are able to fly for hours without flapping their wings and glider is able to rise by riding on thermal currents which are streams of hot air rising in the sky.
12. Explain the impact of the greenhouse on global warning.
13. Explain why Deserts soon get hot during the day and soon get cold after sunset?
14. Explain why Double walled glass vessel is used in thermos flask?
15. Explain why Land breeze blows from land towards sea?
16. Explains why a metal feels colder t touch than wood kept in a cold place?
17. How do land and sea breezes help to keep the temperature moderate in coastal areas?
18. How do thermals help birds to fly for hours without flapping their wings?
19. How do thermals help birds to fly for hours without flapping their wings?
20. How does heat flow from hot to cold parts in metals so rapidly than non-metals?
21. How does heat reach us directly from a fireplace?
22. How does heat reach us from the sun?
23. How does the temperature in a greenhouse can be maintained?
24. How does then flow from hot to cold parts in metals so rapidly than non-metals?
25. How land and sea breezes are produced?
26. How various surfaces can be compared by a Leslie cube?
27. List the thermal conductivities of some substances?
28. List three names by which heat can be transfer from one to place to another place?
29. On which factors rate of radiation depends?
30. Suggest a simple activity 2 sure connection of heat in gases not given in the book.
31. We wear black and dark coloured cloth in winter. Why?
32. We wear white and light coloured cloth in summer. Why?
33. What are Bad conductors or Insulator? Give examples?
34. What are Conductors? Give examples.
35. What causes a glider to remain in the air?
36. What do you know about convection currents in Air? Write down some uses.
37. What is gliding?
38. What is Global warming?
39. What is greenhouse effect?
40. What is meant by conduction?
41. What is meant by convection current?
42. What is the greenhouse effect?
43. Why a balloon inflated with hot air rises up?
44. Why conduction of heat does not take place in gases?
45. Why does a cup of hot tea become cold after sometimes?
46. Why does a glass of chilled (frozen) water become hot after sometimes?
47. Why does sea breeze blow during the day? Why does land breeze blow in the night?
48. Why metals are good conductors of heat?
49. Why Styrofoam boxes are used to keep food hot or ice cream cold for a long time?
50. Why tea in a cup becomes cold earlier as compared to a teapot?
51. Why transfer of heat in fluids takes place by convention?
Long Questions
1. Describe in terms of molecules and electrons how heat transfer occurs in solids.
2. What measures do you suggest conserving energy in houses?
3. How various surfaces can be compared by a Leslie cube?
4. Derive the relation for thermal conductivity of a substance?
5. Describe the users of conductors and non-conductors with examples?
6. Explain the process of radiation?
7. Explain the consequences of heat radiation in greenhouse effect and its effect in global warming.
"8. Explain the energy transfer of a body by radiation does not require a material medium and rate of transfer is affected by:
Colour and texture of the surface
Surface temperature
Surface area"
9. Explain the impact of greenhouse effect in global warming.
10. Explain application and consequences of radiation?
11. Investigate the absorption of radiation by a black surface and silvery surface using Leslie cube. Also investigate the emission of radiation by a black surface and silvery surfaces using Leslie cube.
12. The concrete roof of a house of thickness 20 cm has an area 200 m². The temperature inside the house is 15 °C and outside is 35°C. Find the rate at which thermal energy will be conducted through the roof. The value of k for concrete is 0.65 W m– 1 K– 1
13. What is Conduction? Explain the process and write down it usage in our daily life.
14. On what factors conduction of heat depend? And define thermal conductivity.
15. Write down the uses of conductors and non — conductors.
16. What is convection? Explain the process.
17. What do you know about convection currents in Air? How land and sea breeze
18. What is Gliding? And what do you know about birds gliding?
19. Define Radiation. How does heat reach us from the sun? Explain Radiation. Radiation
20. What is Leslie cube? How various surfaces can be compared by Leslie cube?
21. What do you know about greenhouse effect? Also explain the global warming.
22. Explain the application and consequences of Radiations.