Thermodynamic processes are indicated in the following diagram. Match the following Column – 1 Column - 2 P. Process I a. Adiabatic Q. Process II b. Isobaric R. Process III c. Isochoric S. Process IV d. Isothermal

P → c , Q → a , R → d , S → b

P → a , Q → c , R → d , S → b

P → c , Q → d , R → b , S → a

P → d , Q → b , R → a , S → c

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Explain irreversible process with one example.

Important Questions on Thermodynamics

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

Half mole of an ideal monoatomic gas is heated at a constant pressure of

1 atm

from

20 ° C

90 ° C

. Work done by the gas is

(

Gas constant,

R = 8.21 J {mol}^{- 1} K^{- 1}

)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

One mole of an ideal diatomic gas undergoes a transition from $A$ to $B$ along a path $AB$ as shown in the figure,

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The change in internal energy of the gas during the transition is:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then:

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

The specific heats,

C_{p}

and

C_{v}

of a gas of diatomic molecules,

A,

are given (in units of

J m o l^{- 1} K^{- 1}

) by

29

and

22,

respectively. Another gas of diatomic molecules,

B,

has the corresponding values

30

and

21 .

If they are treated as ideal gases, then:

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

Thermodynamic process is shown below on a $P - V$ diagram for one mole of an ideal gas. If $V_{2} = 2 V_{1}$ , then the ratio of temperature $\frac{T_{2}}{T_{1}}$ is :

Question Image

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

The ratio of work done by an ideal monoatomic gas to the heat supplied to it in an isobaric process is

HARD

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume

u = \frac{U}{V} \propto T^{4}

and pressure

p = \frac{1}{3} (\frac{U}{V})

. If the shell now undergoes an adiabatic expansion the relation between T and R is:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

For an ideal gas with initial pressure and volume

p_{i}

and

V_{i}

respectively, a reversible isothermal expansion happens, when its volume becomes

V_{0}

. Then, it is compressed to its original volume

V_{i}

by a reversible adiabatic process. If the final pressure is

p_{f}

then which of the following statement(s) is/are true?

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

In the given $P - V$ diagram, a monoatomic gas $(γ = \frac{5}{3})$ is first compressed adiabatically from state $A$ state $B$ . Then it expands isothermally from state $B$ to state $C$ . [Given : ${(\frac{1}{3})}^{0.6} = 0.5, \ln 2 \approx 0.7$ ].

Question Image

Which of the following statement(s) is(are) correct?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

Two moles of an ideal gas are allowed to expand from a volume of

10 {dm}^{3}

2 m^{3}

300 K

against a pressure of

101 .325 KPa .

Calculate the work done.

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

In the $P - V$ diagram below the dashed curved line is an adiabatic

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For a process that is described by a straight line joining two points $X$ and $Y$ on the adiabatic (solid line in the diagram), heat is: (Hint: Consider the variations in temperature from $X$ and $Y$ along the straight line)

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

An ideal gas is expanded from

(p_{1}, V_{1}, T_{1}) to (p_{2}, V_{2}, T_{2})

under different conditions. The correct statement(s) among the following is(are)

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

The $P - V$ diagram for an ideal gas in a piston cylinder assembly undergoing a thermodynamic process is shown in the figure. The process is

Question Image

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

A monoatomic gas is compressed from a volume of

2 m^{3}

to a volume of

1 m^{3}

at a constant pressure of

100 N m^{2}

. Then it is heated at constant volume by supplying

150 J

of energy. As a result, the internal energy of the gas

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

The figure shows the graph of $\frac{p V}{T}$ versus $p$ for $2 \times 10^{- 4} kg$ of hydrogen gas at two different temperatures, where $p, V$ and $T$ represents pressure, volume and temperature respectively.Then, the value of $\frac{p V}{T},$ where the curve meet on the vertical axis, is

Question Image

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

A sample of an ideal gas undergoes an isothermal process as shown by the curve $A B$ in the $p V$ diagram. If $Δ Q, Δ U$ and $Δ W$ represent the amount of heat absorbed the change in internal energy and the work done respectively, then which of the following statement is correct?

Question Image

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

An ideal gas undergoes the cyclic process

a b c a

as shown in the given

p - V

diagram.

It rejects

50 J

of heat during

a b

and absorbs

80 J

of heat during

c a

. During

b c

, there is no transfer of heat and

40 J

of work is done by the gas. What should be the area of the closed curve

a b c a ?

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

One mole of an ideal monatomic gas is compressed isothermally in a rigid vessel to double its pressure at room temperature,

27^{o} C

. The magnitude of work done on the gas will be:

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

The given diagram shows four processes i.e., isochoric, isobaric, isothermal and adiabatic. The correct assignment of the processes, in the same order is given by:
Question Image

EASY

Physics>Heat and Thermodynamics>Thermodynamics>Reversible and Irreversible Processes

Thermodynamic processes are indicated in the following diagram.

Question Image

Match the following

Column – 1	Column - 2
P. Process I	a. Adiabatic
Q. Process II	b. Isobaric
R. Process III	c. Isochoric
S. Process IV	d. Isothermal

Explain irreversible process with one example.

Important Questions on Thermodynamics

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