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In transition from the liquid to the vap...

In transition from the liquid to the vapour phase, most of the heat goes to increase the

A

Internal energy

B

Temperature

C

Potential energy

D

Both (1) & (2)

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The correct Answer is:
D
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Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . If heat is added to solids A and B , each in a container that is open to the atmosphere :-

Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . Which is true about the substance in figure?

AAKASH INSTITUTE ENGLISH-THERMODYNAMICS-Assignment (Section-A) Objective Type Questions (one option is correct)
  1. Which of the following laws of thermodynamics defines the term interna...

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  2. Select the incorrect statement

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  3. In transition from the liquid to the vapour phase, most of the heat go...

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  4. Water has maximum density at

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  5. On heating water from 0^(@)C to 100^(@)C its volume

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  6. isotherm is a

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  7. Which of the followig is extensive variable?

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  8. Which of the following is not a path function ?

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  9. The maximum amount of work done, which can be obtained by supplying 40...

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  10. If a gas of volume 10 L is expanded to quadruple its volume at 4 atm p...

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  11. In adiabatic process

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  12. A sample of gas expands from volume V(1) to V(2). The amount of work d...

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  13. The following graph represents

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  14. What is the work done by 0.2 mole of a gas at room temperature to doub...

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  15. If the slope for isotherm is X and the slope for adiabat is Y then

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  16. The value of eta may lie between

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  17. If a carnot engine works between 127^(@)C and 527^(@)C then its effici...

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  18. If the temperature of sink is at absolute zero, then the efficiency of...

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  19. A carnot engine has efficiency of 50% when its sink is at 227^(@)C. Wh...

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  20. In a carnot engine, when heat is absorbed from the source, its tempera...

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