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4

Pick out the wrong statement.

A. Trouton's ratio of non-polar liquids is calculated using Kistyakowsky equation

B. Thermal efficiency of a Carnot engine is always less than 1

C. An equation relating pressure, volume and temperature of a gas is called ideal gas equation

D. None of these

Correct Answer :

C. An equation relating pressure, volume and temperature of a gas is called ideal gas equation


Related Questions

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4

Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called __________ solutions.

A. Ideal

B. Real

C. Isotonic

D. None of these

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4

Throttling (Joule-Thomson effect) process is a constant __________ process.

A. Enthalpy

B. Entropy

C. Pressure

D. None of these

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4

Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)?

A. Air cycle

B. Carnot cycle

C. Ordinary vapour compression cycle

D. Vapour compression with a reversible expansion engine

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4

The most important application of distribution law is in

A. Evaporation

B. Liquid extraction

C. Drying

D. Distillation

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4

A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by

A. P1ACBP2P1

B. ACBB1A1A

C. ACBDA

D. ADBB1A1A

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4

Which is a state function?

A. Specific volume

B. Work

C. Pressure

D. Temperature

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4

Chemical potential of ith component of a system is given by

A. μi = (∂F/∂ni)T, P, ni

B. μi = (∂A/∂ni)T, P, ni

C. μi = (∂F/∂ni)T, P

D. μi = (∂A/∂ni)T, P

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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

Which of the following diagrams does not represent an Otto cycle?

A.

B.

C.

D. None of these

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4

Charles' law for gases states that

A. V/T = Constant

B. V ∝ 1/T

C. V ∝ 1/P

D. PV/T = Constant

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4

For a multi-component system, the term chemical potential is equivalent to the

A. Molal concentration difference

B. Molar free energy

C. Partial molar free energy

D. Molar free energy change

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4

The unit of fugacity is the same as that of the

A. Pressure

B. Temperature

C. Volume

D. Molar concentration

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4

For spontaneous changes in an isolated system (S = entropy)

A. ds = 0

B. ds <0

C. ds > 0

D. ds = Constant

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4

As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is

A. Not changed

B. Decreasing

C. Increasing

D. Data sufficient, can't be predicted

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4

Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O CO2 + H2, by

A. Low temperature and high pressure

B. Low temperature and low pressure

C. High temperature and high pressure

D. High temperature and low pressure

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4

Pick out the wrong statement.

A. A refrigeration cycle violates the second law of thermodynamics

B. Refrigeration cycle is normally represented by a temperature vs. entropy plot

C. In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases

D. One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

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4

In case of the decomposition of hydroiodic acid (2HI H2 + I2), addition of H2 (at equilibrium condition) will

A. Increase the partial pressure of I2

B. Decrease the partial pressure of HI

C. Diminish the degree of dissociation of HI

D. None of these

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4

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

A. Vapor compression cycle using expansion valve

B. Air refrigeration cycle

C. Vapor compression cycle using expansion engine

D. Carnot refrigeration cycle

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4

In jet refrigerators, the refrigerating fluid is practically always

A. Water

B. Ammonia

C. Freon

D. Brine

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4

Near their critical temperatures, all gases occupy volumes __________ that of the ideal gas.

A. Less than

B. Same as

C. More than

D. Half

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4

If we increase the pressure on a substance (which is at its triple point), then the triple point

A. Increases

B. Decreases

C. Remains unchanged

D. May increase or decrease; depends on the substance

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4

Which of the following is not a reversible process?

A. Expansion of an ideal gas against constant pressure

B. Atmospheric pressure vaporisation of water at 100°C

C. Solution of NaCl in water at 50°C

D. None of these

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4

In the ammonia synthesis reaction, N2 + 3H2 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by

A. High temperature

B. Low pressure

C. Low temperature only

D. Both low temperature and high pressure

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4

Fugacity co-efficient of a substance is the ratio of its fugacity to

A. Mole fraction

B. Activity

C. Pressure

D. Activity co-efficient

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4

For an ideal gas, the chemical potential is given by

A. RT d ln P

B. R d ln P

C. R d ln f

D. None of these

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4

Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapour.

A. Superheated

B. Desuperheated

C. Non-condensable

D. None of these

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4

Ideal gas law is applicable at

A. Low T, low P

B. High T, high P

C. Low T, high P

D. High T, low P

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4

With increase in compression ratio, the efficiency of the otto engine

A. Increases

B. Decreases

C. Remain constant

D. Increases linearly

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4

Which of the following exemplifies an adiabatic process?

A. Melting of ice

B. Condensation of alcohol vapor

C. Sudden bursting of a cycle tube

D. Evaporation of water

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4

The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

A. (∂E/∂ni)S, v, nj

B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj

C. (∂H/∂ni)S, P, nj

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