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  1. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is

  2. A.

     Less

    B.

     More

    C.

     Same

    D.

     Dependent on climatic conditions

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  3. The gas law (PV = RT) is true for an __________ change.

  4. A.

     Isothermal

    B.

     Adiabatic

    C.

     Both A & B

    D.

     Neither A nor B

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  5. If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.

  6. A.

     100

    B.

     50

    C.

     205

    D.

     200

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  7. At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is

  8. A.

     1.572

    B.

     1.9398

    C.

     3.389

    D.

     4.238

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  9. Free energy change of mixing two liquid substances is a function of the

  10. A.

     Concentration of the constituents only

    B.

     Quantities of the constituents only

    C.

     Temperature only

    D.

     All of the above

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  11. For an ideal solution, the value of activity co-efficient is

  12. A.

     0

    B.

     1

    C.

     < 1

    D.

     > 1

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  13. The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.

  14. A.

     Contracts

    B.

     Expands

    C.

     Does not change in volume

    D.

     Either A, B or C

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  15. A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

  16. A.

     Isolated

    B.

     Closed

    C.

     Open

    D.

     None of these

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  17. During Joule-Thomson expansion of gases

  18. A.

     Enthalpy remains constant

    B.

     Entropy remains constant

    C.

     Temperature remains constant

    D.

     None of these

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  19. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

  20. A.

     R loge 4

    B.

     R log10 4

    C.

     Cv log10 4

    D.

     Cv loge 4

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