Three different processes that can occur in an ideal monoatomic gas are shown in the P vs V diagram. The paths are labelled as A → B , A → C and A → D . The change in internal energies during these process are taken as E A B , E A C and E A D and the work done as W A B , W A C and W A D . The correct relation between these parameters are:

E A B = E A C = E A D , W A B > 0 , W A C = 0 , W A D < 0

E A B = E A C < E A D , W A B > 0 , W A C = 0 , W A D < 0

E A B < E A C < E A D , W A B > 0 , W A C > W A D

E A B > E A C > E A D , W A B < W A C < W A D

A gas is filled in a box, which is moving with velocity v → . The internal energy of the gas will not include kinetic energy:

of box due to its translational motion.

of molecules due to translational motion.

of molecules due to rotational motion.

of molecules due to vibrational motion.

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Which among this is not an exothermic reaction?

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Important Questions on Thermodynamics

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

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

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

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

The pressure versus temperature graph of an ideal gas is shown in the figure below. If the density of gas at point $A$ is $ρ_{0}$ , then the density of the gas at point $B$ will be

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

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?

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

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

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HARD

Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Three different processes that can occur in an ideal monoatomic gas are shown in the $P$ vs $V$ diagram. The paths are labelled as $A \to B, A \to C$ and $A \to D$ . The change in internal energies during these process are taken as $E_{A B}, E_{A C}$ and $E_{A D}$ and the work done as $W_{A B}, W_{A C}$ and $W_{A D}$ . The correct relation between these parameters are:

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MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

A system goes from $A$ to $B$ via two processes $I$ and $II$ shown in the figure. If $Δ U_{1}$ and $Δ U_{2}$ are the changes in internal energies in the processes I and Il respectively

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HARD

Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

A one mole of ideal gas goes through a process in which pressure

P

varies with volume

V

P = 3 - g {(\frac{V}{V_{0}})}^{2}

, where

V_{0}

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)

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

A balloon is filled at

27 ° C

and

1 atm

pressure by

500 m^{3}

He

. At

- 3 ° C

and

0.5 atm

pressure, the volume of

He

will be

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

If an average person jogs, he produces

14.5 \times 10^{3} cal / \min

. This is removed by the evaporation of sweat. What will be the amount of sweat evaporated per minute?(assuming

1 kg

requires

580 \times 10^{3} cal

for evaporation).

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

The heat supplied to a system is used up entirely by the system in doing work on the environment during

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

An open system is one in which

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Which of the following parameters can define the thermodynamic state of a system?

MEDIUM

Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Water of volume 2 litre in a container is heated with a coil of 1 kW at 27^oC. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27^oC to 77^oC? [Given specific heat of water is 4.2 kJ/kg]

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Some of the thermodynamic parameters are state variables while some are process variables. Some grouping of the parameters are given. Choose the correct one

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Which one of the following is not a macroscopic variable of the gas (system) filled in a container?

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Identify which pair of state parameters can completely describe the system.

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

Human body is an example of

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Physics>Heat and Thermodynamics>Thermodynamics>General Terms in Thermodynamics

A gas is filled in a box, which is moving with velocity