Thermodynamics (Physics)

In an adiabatic expansion, the temperature of one mole of an ideal monatomic gas ( = 5/3) decreases from 60 K to 50 K. The work done by the gas in the process is: (Take the universal gas constant as R = 8.3 J mol-1 K-1)

1. 166 J
2. 41.5 J
3. 83 J
4. 124.5 J

An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric and isochoric. The curve which represents the adiabatic process among 1, 2, 3 and 4 is [figure]

1. 1
2. 2
3. 3
4. 4

An ideal gas follows a process described by the equation PV2 = C from the initial (P1, V1, T1) to final (P2, V2, T2) thermodynamic states, where C is a constant. Then

1. If P1 > P2 then V1 > V2
2. If P1 > P2 then T1 < T2
3. If V2 > V1 then T2 > T1
4. If V2 > V1 then T2 < T1

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is :

1. adiabatic
2. isochoric
3. isobaric
4. isothermal

In which of the following processes, heat is neither absorbed nor released by a system?

1. adiabatic
2. isobaric
3. isochoric
4. isothermal

The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is [figure]

1. 25
2. 23
3. 13
4. 27

Thermodynamic processes are indicated in the following diagram. [figure] Match the following

1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
2. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
3. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
4. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

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

1. Compressing the gas isothermally or adiabatically will require the same amount of work.
2. Which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas.
3. Compressing the gas isothermally will require more work to be done.
4. Compressing the gas through adiabatic process will require more work to be done.

One mole of an ideal monatomic gas undergoes a process described by the equation PV3 = constant. The heat capacity of the gas during this process is

1. 32 R
2. 52 R
3. 2R
4. R

An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas ?

1. Isochoric
2. Isothermal
3. Adiabatic
4. Isobaric

A monatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is (Take = 5/3)

1. 64P
2. 32P
3. P/64
4. 16P

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of CpCv for the gas is

1. 53
2. 32
3. 43
4. 2

Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meaning?

1. P1- T = constant
2. PV = constant
3. TV -1 = constant
4. P T1- = constant

One mole of an ideal gas goes from an initial state A to final state B via two processes : It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct P-V diagram representing the two processes is

1. [figure]
2. [figure]
3. [figure]
4. [figure]

A mass of diatomic gas ( = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rises from 27 to 927 . The pressure of the gas in the final state is

1. 8 atm
2. 28 atm
3. 68.7 atm
4. 256 atm

A monatomic gas at pressure P1 and volume V1 is compressed adiabatically to 18th of its original volume. What is the final pressure of the gas?

1. 64P1
2. P1
3. 16P1
4. 32P1

In thermodynamic processes which of the following statements is not true ?

1. In an isochoric process pressure remains constant.
2. In an isothermal process the temperature remains constant.
3. In an adiabatic process PV = constant.
4. In an adiabatic process the system is insulated from the surroundings.

One mole of an ideal gas at an initial temperature of T K does 6R joule of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be

1. (T + 2.4) K
2. (T - 2.4) K
3. (T + 4) K
4. (T - 4) K