4

# Requisites of a reversible process is that the

System and surroundings pressure be equal

Friction in the system should be absent

System and surroundings temperature be equal

None of these

B. Friction in the system should be absent

4

Isobaric

Isothermal

Isentropic

Isometric

4

n = y = 1.4

n = 0

n = 1

n = 1.66

4

# Which is not constant for an ideal gas?

(∂P/∂V)T

(∂V/∂T)P

(∂P/∂V)V

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

4

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

Increases

Decreases

Remain constant

Increases linearly

4

2

0

1

3

4

# At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

More

Less

Same

More or less; depending on the system

4

3

4

5

6

4

# The equation, PV = nRT, is best obeyed by gases at

Low pressure & high temperature

High pressure & low temperature

Low pressure & low temperature

None of these

4

# Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will

Increase on addition of an inert gas at constant pressure

Decrease on increasing the pressure of the system

None of these

4

# In Joule-Thomson porous plug experiment, the

Enthalpy does not remain constant

Entire apparatus is exposed to surroundings

Temperature remains constant

None of these

4

-94 kcal

> -94 kcal

< - 94 kcal

Zero

4

# __________ does not change during phase transformation processes like sublimation, melting & vaporisation.

Entropy

Gibbs free energy

Internal energy

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

4

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

Fugacity

Partial pressure

Activity co-efficient

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

4

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

Ice at the base contains impurities which lowers its melting point

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

The iceberg remains in a warmer condition at the base

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

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?

Vapor compression cycle using expansion valve

Air refrigeration cycle

Vapor compression cycle using expansion engine

Carnot refrigeration cycle

4

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

Cp/Cv

Cp/(CP-R)

1 + (R/CV)

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

4

Momentum

Mass

Energy

None of these

4

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

Constant volume

Polytropic

Constant pressure

4

# Heat of formation of an element in its standard state is

0

< 0

> 0

A function of pressure

4

# Pick out the wrong statement.

System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature

Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature

Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures

None of these

4

Specific volume

Temperature

Mass

Pressure

4

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

Air cycle

Carnot cycle

Ordinary vapour compression cycle

Vapour compression with a reversible expansion engine

4

# A solid is transformed into vapour without going to the liquid phase at

Triple point

Boiling point

Below triple point

Always

4

Molecular size

Volume

Pressure

Temperature

4

# The expression, nCv(T2 - T1), is for the __________ of an ideal gas.

Co-efficient of thermal expansion

Compressibility

None of these

4

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

Not changed

Decreasing

Increasing

Data sufficient, can't be predicted

4

(T2 - T1)/T2

(T2 - T1)/T1

(T1 - T2)/T2

(T1 - T2)/T1

4

Isothermal

Isentropic

Polytropic

4

Endothermic

Exothermic

Isothermal