Heat transfer by conduction, convection and radiation - One Line Questions

1. The emissivity of a perfectly black body is: — 1
2. If the temperature of an object is doubled, the energy radiated per unit time increases by a factor of: — 16
3. Which of the following is a good conductor of heat? — Iron
4. The rate of heat transfer by conduction through a plane wall is given by Fourier's Law: dQ/dt = -kA(dT/dx). Here, A represents: — Area of cross-section perpendicular to heat flow
5. Which mode of heat transfer does not require a medium? — Radiation
6. When a metal spoon is dipped in hot soup, the heat is transferred to the handle by: — Conduction
7. The process of heat transfer in liquids and gases due to the movement of the fluid itself is called: — Convection
8. Which phenomenon is responsible for the formation of land and sea breezes? — Convection
9. Which of the following is NOT a mechanism of heat transfer? — Evaporation
10. A person feels warmer near a fire due to heat transfer by: — Radiation
11. The phenomenon of a hot air balloon rising is an example of: — Convection
12. The primary mode of heat transfer from the Sun to the Earth is: — Radiation
13. Which type of heat transfer involves the emission of electromagnetic waves? — Radiation
14. A thermos flask works on the principle of minimizing heat transfer by: — Conduction, Convection, and Radiation
15. The phenomenon of boiling water in a pot is primarily due to: — Convection currents within the water
16. In solids, heat is primarily transferred by: — Conduction
17. Which of the following is the most efficient way to transfer heat through a solid? — Conduction
18. Which material is a poor conductor of heat? — Wood
19. The temperature of a black body is increased, its radiated power: — Increases
20. Heat transfer by radiation is fastest when the medium is: — Rarefied
21. In a convection current, the warmer fluid rises because it is: — Less dense
22. Which of the following has the highest thermal conductivity? — Diamond
23. The heat transfer by conduction in metals is mainly due to the movement of: — Free electrons
24. Which of the following is an example of heat transfer by radiation? — Warmth of the sun felt on Earth
25. Which property of a material is most important for its use as a thermal insulator? — Low thermal conductivity
26. The effectiveness of a material as a thermal insulator is measured by its: — Low thermal conductivity
27. Which of the following statements about conduction is FALSE? — It is the primary mode of heat transfer in fluids.
28. The thermal conductivity of a material depends on: — All of the above
29. A body at a high temperature will radiate energy at a rate proportional to: — Its temperature to the fourth power
30. The rate of heat radiated by a body is directly proportional to its: — Surface area
31. Which of the following is an example of heat transfer by convection? — Heating of a room by a heater
32. Which law governs the thermal radiation emitted by a black body? — Stefan-Boltzmann Law
33. Which of the following surfaces will emit the maximum thermal radiation at a given temperature? — Dull black surface
34. The surface of a good emitter of thermal radiation is also a good: — Absorber
35. In which of the following states of matter does convection occur most effectively? — Gases
36. Which of the following is a good thermal insulator? — Rubber
37. According to Stefan's Law, the total energy radiated per unit surface area of a black body per unit time is proportional to: — T^4
38. A black body at absolute temperature T radiates energy at a rate proportional to: — T^4
39. Newton's Law of Cooling states that the rate of cooling of a body is proportional to the: — Excess temperature of the body over the surroundings
40. The rate of heat transfer by radiation is independent of: — The medium through which radiation travels
41. Convection current is formed due to difference in: — Temperature and density
42. A convection current in a fluid will stop if: — There is no temperature difference
43. In the context of heat transfer, 'thermal resistance' is the reciprocal of: — Thermal conductance
44. The R-value of thermal insulation is a measure of: — Thermal resistance
45. The thermal resistance of a material is inversely proportional to its: — Thermal conductivity
46. The phenomenon of heat transfer through conduction is most significant in: — Solids
47. During convection, heat is transferred by: — Movement of the fluid itself
48. Wien's displacement law relates the wavelength of maximum spectral radiance of a black body to its: — Temperature
49. The Stefan-Boltzmann constant (sigma) has units of: — W/(m^2 K^4)
50. The SI unit of the coefficient of thermal conductivity is: — All of the above
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