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.

One calorie is defined as the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius at a pressure of one atmosphere. A calorie is a unit of measure of energy.

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A closed system always contains the same matter; there is no transfer of matter across its boundary.

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Important Questions on Thermodynamics

EASY

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

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)

MEDIUM

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

The Clausius-Clayperon equation helps to calculate

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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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MEDIUM

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

n

moles of an ideal gas undergoes a process

A \to B

as shown in the figure. The maximum temperature of the gas during the process will be:
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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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EASY

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

Which of the following statement is incorrect

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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EASY

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

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

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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

\vec{v}

. The internal energy of the gas will not include kinetic energy:

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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

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

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]

MEDIUM

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

If two systems are separated by a diathermic wall, the macroscopic quantity which is equal for two systems is:

EASY

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

Distinguish between heat and temperature?

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

A system is in a state of thermodynamical equilibrium, if:

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

Define one calorie.