EASY
Earn 100

An adiabatic process occurs in

50% studentsanswered this correctly

Important Questions on Thermodynamics

EASY
Which of the following statement is incorrect
HARD
A one mole of ideal gas goes through a process in which pressure P varies with volume V as P=3-gVV02, where V0 is a constant. The maximum attainable temperature by the ideal gas during this process is (All quantities are in SI units and R is gas constant)
EASY

Consider the following thermodynamical variables
(i) Pressure
(ii) Internal Energy
(iii) Volume
(iv) Temperature

Out of these, the intensive variable(s) is (are)

MEDIUM
For the isothermal reversible expansion of an ideal gas
EASY
A balloon is filled at 27 °C and 1 atm pressure by 500 m3 He. At -3 °C and 0.5 atm pressure, the volume of He will be
MEDIUM
The Clausius-Clayperon equation helps to calculate
EASY

Consider the given diagram. An ideal gas is contained in a chamber (left) of volume V and is at an absolute temperature T. It is allowed to rush freely into the right chamber of volume V which is initially vacuum. The whole system is thermally isolated. What will be the final temperature, if the equilibrium has been attained?

Question Image 

EASY
Among the following, the set of parameters that represents path functions, is:
i) q+w
ii) q
iii) w
iv) H-TS
EASY

The pressure versus temperature graph of an ideal gas is shown in the figure below. If the density of gas at point A is ρ0, then the density of the gas at point B will be

Question Image

MEDIUM

A system goes from A to B via two processes I and II shown in the figure. If ΔU1 and ΔU2 are the changes in internal energies in the processes I and Il respectively

Question Image

MEDIUM
A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be
HARD
A closed tank has two compartments A and B, both filled with oxygen (assumed to be ideal gas). The partition separating the two compartments is fixed and is a perfect heat insulator (Figure1). If the old partition is replaced by a new partition which can slide and conduct heat but does not allow the gas to leak across (Figure 2), the volume (in m3) of the compartment A after the system attains equilibrium is 20x m3. Write the value of x.

Question Image

Question Image
MEDIUM
An ideal gas in a thermally insulated vessel at internal pressure = P1 , volume = V1 and absolute temperature = T1 expands irreversibly against zero external pressure, as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are P2 , V2 and T2 , respectively. For this expansion,

Question Image
EASY
If system A is in thermal equilibrium with B and B is separately in thermal equilibrium with C, then A and C are in thermal equilibrium. From which thermodynamics law, does this follow?
MEDIUM
5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If CV=28 J K-1, calculate U and pV for the process. (R=8.0 J K-1 mol-1)
EASY
For one mole of an ideal gas, which of these statements must be true?
(a) Internal energy (U) and enthalpy (H) each depends on temperature.
(b) Compressibility factor Z is not equal to 1
(c) CP, m CV, m=R
(d) dU=CvdT for any process
EASY
An ideal gas is allowed to expand from 1 L to 10 L against a constant external pressure of 1 bar. The work done in kJ is:
EASY

Pressure versus temperature graph of an ideal gas at constant volume V is shown by the straight-line A. Now mass of the gas is doubled and the volume is halved then the corresponding pressure versus temperature graph will be shown by the line

Question Image

HARD

Three different processes that can occur in an ideal monoatomic gas are shown in the P vs V diagram. The paths are labelled as AB,AC and AD. The change in internal energies during these process are taken as EAB,EAC and EAD and the work done as WAB,WAC and WAD. The correct relation between these parameters are:

Question Image

MEDIUM
n moles of an ideal gas undergoes a process AB as shown in the figure. The maximum temperature of the gas during the process will be:
Question Image