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

A. Isolated

B. Closed

C. Open

D. None of these

Correct Answer :

C. Open


Related Questions

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4

The principle applied in liquefaction of gases is

A. Adiabatic expansion

B. Joule-Thomson effect

C. Both (A) and (B)

D. Neither (A) nor (B)

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4

Any substance above its critical temperature exists as

A. Saturated vapour

B. Solid

C. Gas

D. Liquid

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4

Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.

A. Fugacity

B. Partial pressure

C. Activity co-efficient

D. All (A), (B), and (C)

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4

In a homogeneous solution, the fugacity of a component depends upon the

A. Pressure

B. Composition

C. Temperature

D. All (A), (B) and (C)

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4

During Joule-Thomson expansion of gases

A. Enthalpy remains constant

B. Entropy remains constant

C. Temperature remains constant

D. None of these

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4

Work done is a

A. Property of the system

B. Path function

C. Point function

D. State description of a system

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4

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

A. Bomb

B. Separating

C. Bucket

D. Throttling

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4

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

A. Maxwell's equation

B. Clausius-Clapeyron Equation

C. Van Laar equation

D. Nernst Heat Theorem

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4

Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is

A. 0

B. 1

C.

D. None of these

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4

Joule-Thomson co-efficient for a perfect gas is

A. Zero

B. Positive

C. Negative

D. None of these

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4

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system?

A. Expansion valve

B. Condenser

C. Refrigerator

D. Compressor

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4

What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?

A. 2

B. 0

C. 3

D. 1

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4

Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is

A. (T2 - T1)/T2

B. (T2 - T1)/T1

C. (T1 - T2)/T2

D. (T1 - T2)/T1

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4

Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

A. Calorific value

B. Heat of reaction

C. Heat of combustion

D. Heat of formation

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4

Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

A. Increase

B. Decrease

C. Remain unchanged

D. First fall and then rise

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4

Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.

A. 0

B. 273

C. 25

D. None of these

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4

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

A. CO2

B. H2

C. O2

D. N2

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4

Sublimation temperature of dry ice (solid CO2) is __________ °C.

A. -273

B. 0

C. -78

D. 5

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4

Mollier chart is a __________ plot.

A. Pressure vs. enthalpy

B. Pressure vs. volume

C. Enthalpy vs. entropy

D. Temperature vs. entropy

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4

For an irreversible process involving only pressure-volume work

A. (dF)T, p <0

B. (dF)T, p = 0

C. (dF)T, p > 0

D. (dA)T, v >0

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4

No work is done by the system, when a reaction occurs at constant

A. Volume

B. Temperature

C. Pressure

D. None of these

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4

Pick out the wrong statement:

A. The expansion of a gas in vacuum is an irreversible process

B. An isometric process is a constant pressure process

C. Entropy change for a reversible adiabatic process is zero

D. Free energy change for a spontaneous process is negative

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4

If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will

A. Increase

B. Decrease

C. Remain unaltered

D. Increase or decrease; depends on the particular reaction

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4

In any spontaneous process, the __________ free energy decreases.

A. Helmholtz

B. Gibbs

C. Both a & b

D. Neither 'a' nor 'b'

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4

Entropy change in case of reversible adiabatic process is

A. Minimum

B. Zero

C. Maximum

D. Indeterminate

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4

Joule-Thomson effect i.e., a throttling process is a constant __________ process.

A. Entropy

B. Temperature

C. Internal energy

D. Enthalpy

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4

A large iceberg melts at the base, but not at the top, because of the reason that

A. Ice at the base contains impurities which lowers its melting point

B. Due to the high pressure at the base, its melting point reduces

C. The iceberg remains in a warmer condition at the base

D. All (A), (B) and (C)

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4

Gibbs free energy of mixing at constant pressure and temperature is always

A. 0

B.

C. + ve

D. - ve

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4

As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches

A. Zero

B. Unity

C. Infinity

D. An indeterminate value

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4

For equilibrium process (i.e. reversible) in an isolated system

A. ds = 0

B. ds < 0

C. ds > 0

D. ds = Constant