Home
Current Affairs January 2024

What is the correct answer?

4

y = specific heat ratio of an ideal gas is equal to

A. Cp/Cv

B. Cp/(CP-R)

C. 1 + (R/CV)

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

Correct Answer :

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


Related Questions

What is the correct answer?

4

Heat of formation of an element in its standard state is

A. 0

B. < 0

C. > 0

D. A function of pressure

What is the correct answer?

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

What is the correct answer?

4

Dry ice is

A. Moisture free ice

B. Solid helium

C. Solid carbon dioxide

D. None of these

What is the correct answer?

4

The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.

A. Van Laar

B. Margules

C. Gibbs-Duhem

D. Gibbs-Duhem-Margules

What is the correct answer?

4

Heat is added at constant temperature in an ideal __________ cycle.

A. Stirling

B. Brayton

C. Rankine

D. None of these

What is the correct answer?

4

The enthalpy change when ammonia gas is dissolved in water is called the heat of

A. Solution

B. Formation

C. Dilution

D. Combustion

What is the correct answer?

4

The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is

A. 0

B.

C. +ve

D. -ve

What is the correct answer?

4

Entropy change of mixing two liquid substances depends upon the

A. Molar concentration

B. Quantity (i.e. number of moles)

C. Both (A) and (B)

D. Neither (A) nor (B)

What is the correct answer?

4

The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is

A. The statement as per Gibbs-Helmholtz

B. Called Lewis-Randall rule

C. Henry's law

D. None of these

What is the correct answer?

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

What is the correct answer?

4

The internal energy of an ideal gas is a function of its __________ only.

A. Molecular size

B. Volume

C. Pressure

D. Temperature

What is the correct answer?

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)

What is the correct answer?

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

What is the correct answer?

4

When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is

A. Same in both the phases

B. Zero in both the phases

C. More in vapour phase

D. More in liquid phase

What is the correct answer?

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

What is the correct answer?

4

A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P1 and P2. (where, P1 and P2 are initial and final pressures respectively)

A. Logarithmic

B. Arithmetic

C. Geometric

D. Harmonic

What is the correct answer?

4

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

A. Increases

B. Decreases

C. Remain constant

D. Increases linearly

What is the correct answer?

4

The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.

A. Increases

B. Decreases

C. Remains unchanged

D. Decreases linearly

What is the correct answer?

4

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

A. Contracts

B. Expands

C. Does not change in volume

D. Either (A), (B) or (C)

What is the correct answer?

4

What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?

A. 0

B. 1

C. 2

D. 3

What is the correct answer?

4

Equilibrium constant of a reaction varies with the

A. Initial concentration of the reactant

B. Pressure

C. Temperature

D. None of these

What is the correct answer?

4

The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

A. (∂T/∂V)S = - (∂P/∂S)V

B. (∂S/∂P)T = - (∂V/∂T)P

C. (∂V/∂S)P = (∂T/∂P)S

D. (∂S/∂V)T = (∂P/∂T)V

What is the correct answer?

4

Pick out the correct statement:

A. In an isothermal system, irreversible work is more than reversible work

B. Under reversible conditions, the adiabatic work is less than isothermal work

C. Heat, work, enthalpy and entropy are all 'state functions'

D. Matter and energy cannot be exchanged with the surroundings in a closed system

What is the correct answer?

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)

What is the correct answer?

4

Trouton's ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K)

A. λb/Tb

B. Tb/λb

C. √(λb/Tb)

D. √(Tb/λb)

What is the correct answer?

4

Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).

A. Pressure must be kept below 5.2 atm

B. Temperature must be kept above - 57°C

C. Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C

D. Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively

What is the correct answer?

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

What is the correct answer?

4

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

A. ds = 0

B. ds < 0

C. ds > 0

D. ds = Constant

What is the correct answer?

4

Isentropic process means a constant __________ process.

A. Enthalpy

B. Pressure

C. Entropy

D. None of these

What is the correct answer?

4

Third law of thermodynamics is concerned with the

A. Value of absolute entropy

B. Energy transfer

C. Direction of energy transfer

D. None of these