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  1. Melting of wax is accompanied with __________ in entropy.

  2. A.

     Increase

    B.

     Decrease

    C.

     No change

    D.

     None of these

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  3. Joule-Thomson co-efficient for a perfect gas is

  4. A.

     Zero

    B.

     Positive

    C.

     Negative

    D.

     None of these

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  5. Activity co-efficient is a measure of the

  6. A.

     Departure from ideal solution behaviour

    B.

     Departure of gas phase from idea] gas law

    C.

     Vapour pressure of liquid

    D.

     None of these

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  7. The main feature of Carnot refrigeration cycle is that, it

  8. A.

     Does not need the addition of external work for its functioning

    B.

     Transfers heat from high temperature to low temperature

    C.

     Accomplishes the reverse effect of the heat engine

    D.

     None of these

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  9. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

  10. A.

     Increased COP

    B.

     Same COP

    C.

     Decreased COP

    D.

     Increased or decreased COP ; depending upon the type of refrigerant

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  11. A refrigerator may be termed as a

  12. A.

     Heat pump

    B.

     Heat engine

    C.

     Carnot engine

    D.

     None of these

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  13. In the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl₂, decrease in the pressure of the system will __________ the degree of dissociation of PCl5.

  14. A.

     Increase

    B.

     Decrease

    C.

     Not alter

    D.

     None of these

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  15. The four properties of a system viz. P, V, T, S are related by __________ equation.

  16. A.

     Gibbs-Duhem

    B.

     Gibbs-Helmholtz

    C.

     Maxwell's

    D.

     None of these

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  17. Melting of ice exemplifies a/an

  18. A.

     Adiabatic process

    B.

     Endothermic reaction

    C.

     Exothermic reaction

    D.

     Process involving a chemical reaction

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  19. Entropy change for an irreversible process taking system and surrounding together is

  20. A.

     0

    B.

     > 0

    C.

     < 0

    D.

     None of these

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