Liquefaction of Gases and Heat Transfer - One Line Questions

1. Which of the following would be the best insulator? — A thick layer of styrofoam
2. The principle behind the working of a refrigerator is: — Joule-Thomson effect
3. Which of the following is a poor conductor of heat (a good insulator)? — Rubber
4. The process of liquefaction of gases is an example of: — An exothermic process
5. A gas is liquefied when its temperature is below its: — Critical temperature
6. Which gas has the lowest critical temperature? — Hydrogen
7. In which mode of heat transfer does heat travel through electromagnetic waves? — Radiation
8. Which of these processes involves the transfer of heat through the movement of fluid particles? — Convection
9. The process of heat transfer from the sun to the Earth occurs mainly through: — Radiation
10. The silvered surfaces in a thermos flask reduce heat transfer by: — Radiation
11. The process where heat is transferred through a fluid by the bulk movement of the fluid itself is called: — Convection
12. Which phenomenon is responsible for the cooling effect observed when a liquid evaporates? — Evaporative cooling (a form of convection/mass transfer)
13. A thermos flask is designed to minimize heat transfer by: — Conduction, convection, and radiation
14. The phenomenon of heat transfer from a hot object to a cold object through direct contact is called: — Conduction
15. What is the primary mechanism of heat transfer in solids? — Conduction
16. Which of the following is an example of heat transfer by convection? — Boiling of water in a pot.
17. Which of the following gases is easiest to liquefy? — Oxygen (Critical Temperature: 154.3 K)
18. When water boils, the heat supplied is used to: — Increase the potential energy of molecules by overcoming intermolecular forces.
19. Which phenomenon is responsible for the liquefaction of gases by cooling? — Reduced molecular speed and increased intermolecular attraction
20. The liquefaction of a gas can be achieved by: — Decreasing its temperature and increasing pressure.
21. The process of liquefaction of a gas is facilitated by: — Decreasing temperature and increasing pressure
22. The process of liquefaction of a gas involves: — Decreasing the average kinetic energy of molecules and increasing intermolecular forces.
23. According to the kinetic theory of gases, liquefaction occurs when: — Intermolecular attractive forces overcome the kinetic energy of molecules.
24. Which method is NOT used for liquefaction of gases? — Isothermal compression
25. The characteristic curve for the liquefaction of a gas is the: — Phase diagram
26. Which of the following statements about radiation is incorrect? — Its speed depends on the medium.
27. What happens to the internal energy of a gas when it is liquefied under constant pressure? — It decreases significantly.
28. Which of the following properties of a gas is crucial for its liquefaction via the Joule-Thomson effect? — Its critical temperature and pressure
29. Why does a metal spoon feel colder than a wooden spoon when both are at the same room temperature? — Metal is a better conductor of heat, drawing heat away from the hand faster.
30. Why are cooking pots often made of metals like copper or aluminum with a black bottom? — Metals are good conductors, and black surfaces are good absorbers of radiation.
31. If the surface of an object is rough and black, it is a: — Good absorber and good emitter of radiation
32. Linde's process is used for: — Liquefaction of gases
33. Which of the following modes of heat transfer requires a medium? — Both Convection and Conduction
34. Which of the following is an example of heat transfer by conduction? — Heating of an iron pan on a stove
35. The liquefaction of air is primarily achieved using: — The Joule-Thomson effect and regenerative cooling
36. Convection is the primary mode of heat transfer in: — Liquids and Gases
37. The ability of a material to transfer heat is known as its: — Thermal conductivity
38. The rate of heat transfer by radiation is independent of: — Nature of the medium
39. In the context of heat transfer, what is emissivity? — The ratio of the energy radiated by a surface to the energy radiated by a perfect black body at the same temperature.
40. The rate of heat loss by radiation is proportional to: — The fourth power of the absolute temperature of the surface.
41. The liquefaction of a gas is a process where: — Intermolecular distances decrease significantly, and attractive forces become dominant.
42. The critical pressure of a gas is: — The pressure required to liquefy the gas at its critical temperature.
43. What is the critical temperature of a gas? — The temperature below which a gas can be liquefied by pressure alone.
44. What is meant by the 'triple point' of a substance? — The temperature and pressure at which solid, liquid, and gas phases coexist in equilibrium.
45. What is the Joule-Thomson effect? — The change in temperature of a gas when it expands freely through a porous plug.
46. Which of the following is the most effective way to insulate a house? —
47. Which substance is commonly used as a refrigerant due to its low boiling point and ease of liquefaction? — Ammonia
48. Which of the following is the best conductor of heat? — Copper
49. The liquefaction of a gas by adiabatic expansion is based on the principle of: — Work done by the gas reducing its internal energy.
50. When a gas is compressed rapidly, its temperature increases due to: — Work done on the gas
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