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4

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature.

A. Boyle

B. Inversion

C. Critical

D. Reduced

Correct Answer :

A. Boyle


Related Questions

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Entropy change in case of reversible adiabatic process is

A. Minimum

B. Zero

C. Maximum

D. Indeterminate

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An irreversible process

A. Is the analog of linear frictionless motion in machines

B. Is an idealised visualisation of behaviour of a system

C. Yields the maximum amount of work

D. Yields an amount of work less than that of a reversible process

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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

A domestic refrigerator has a/an __________ cooled condenser.

A. Water

B. Air

C. Evaporative

D. Gas

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For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

A. Decreases

B. Increases

C. Remain same

D. Decreases linearly

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4

The quantitative effect of temperature on chemical equilibrium is given by the

A. Vant-Hoff equation

B. Le-Chatelier's principle

C. Arrhenius equation

D. None of these

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4

In the reaction; N2 + O2 2NO, increasing the pressure will result in

A. Shifting the equilibrium towards right

B. Shifting the equilibrium towards left

C. No change in equilibrium condition

D. None of these

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4

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

A. Positive

B. Negative

C. Zero

D. Infinity

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4

Which is not constant for an ideal gas?

A. (∂P/∂V)T

B. (∂V/∂T)P

C. (∂P/∂V)V

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

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4

The equilibrium constant for a chemical reaction at two different temperatures is given by

A. Kp2/Kp1 = - (ΔH/R) (1/T2 - 1/T1)

B. Kp2/Kp1 = (ΔH/R) (1/T2 - 1/T1)

C. Kp2/Kp1 = ΔH (1/T2 - 1/T1)

D. Kp2/Kp1 = - (1/R) (1/T2 - 1/T1)

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4

Which is not a refrigerant?

A. SO2

B. NH3

C. CCl2F2

D. C2H4Cl2

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4

The chemical potential for a pure substance is __________ its partial molal free energy.

A. More than

B. Less than

C. Equal to

D. Not related to

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4

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature.

A. Boyle

B. Inversion

C. Critical

D. Reduced

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4

For an ideal gas, the internal energy depends upon its __________ only.

A. Molecular size

B. Temperature

C. Volume

D. Pressure

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4

Entropy of the system decreases, when

A. Snow melts into water

B. A gas expands spontaneously from high pressure to low pressure

C. Water is converted into ice

D. Both (B) & (C)

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4

COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

A. 0.5

B. 3.5

C. 4.5

D. 8.5

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4

For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is

A. x

B. x + 1

C. x + 2

D. x + 3

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4

The heat capacities for the ideal gas state depend upon the

A. Pressure

B. Temperature

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process.

A. Adiabatic

B. Isometric

C. Isentropic

D. Isothermal

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4

An ideal liquid refrigerant should

A. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils

B. Not have unduly high vapour pressure at the condenser temperature

C. Both (A) and (B)

D. Have low specific heat

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4

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

A. Gibbs-Duhem

B. Gibbs-Helmholtz

C. Maxwell's

D. None of these

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4

Internal energy is equal to the heat absorbed in case of a/an __________ process.

A. Constant volume

B. Polytropic

C. Adiabatic

D. Constant pressure

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4

Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)

A. T

B. √T

C. T2

D. 1/√T

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4

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

A. R loge 4

B. R log10 4

C. Cv log10 4

D. Cv loge 4

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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

Heating of water under atmospheric pressure is an __________ process.

A. Isochoric

B. Isobaric

C. Adiabatic

D. Isothermal

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4

For a constant pressure reversible process, the enthalpy change (ΔH) of the system is

A. Cv.dT

B. Cp.dT

C. ∫ Cp.dT

D. ∫ Cv.dT

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4

Maxwell's relation corresponding to the identity, dH = dS = Vdp + Σμi dni is

A. (∂T/∂V)S, ni = -(∂P/∂S)V, ni

B. (∂S/∂P)T, ni = (∂V/∂T)P, ni

C. (∂S/∂V)T, ni = (∂P/∂T)V, ni

D. (∂T/∂P)S, ni = (∂V/∂S)P, ni

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4

In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.

A. 0.25

B. 0.5

C. 0.75

D. 1

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A gas performs the maximum work, when it expands

A. Non-uniformly

B. Adiabatically

C. Isobarically

D. Isothermally