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A system is said to be an isolated system if

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Important Questions on Thermodynamics

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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

An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is

S_{1}

and that of the other part is

S_{2}

. Given that

S_{1} > S_{2}

. If the piston is removed then the total entropy of the system 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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MEDIUM

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

A monoatomic gas of mass

4.0 u

is kept in an insulated container. The container is moving with velocity

30 m s^{- 1}

. If the container is suddenly stopped then a change in temperature of the gas (

R =

gas constant) is

\frac{x}{3 R}

. Value of

x

is,

MEDIUM

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

N

moles of diatomic gas in a cylinder is at a temperature

T

. Heat is supplied to the cylinder such that the temperature remains constant but

n

moles of the diatomic gas get converted into monoatomic gas. The change in the total kinetic energy of the gas is

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

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

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

A sample of

0.1 g

of water at

100^{o} C

and normal pressure

(1.013 \times 10^{5} N m^{- 2})

requires

54 cal

of heat energy to convert to steam at

100^{o} C

. If the volume of the steam produced is

167.1 cc,

the change in internal energy of the sample, is

HARD

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

The internal energy

(U)

, pressure

(P)

and volume

(V)

of an ideal gas are related as

U = 3 P V + 4 .

The gas is

MEDIUM

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

A gas mixture consists of

2

moles of

O_{2}

and 4 moles of

Ar

at temperature

T

. Neglecting all vibrational modes, the total internal energy of the system is (

R

is universal gas constant)

MEDIUM

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

One mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure. The process BC is adiabatic. The temperatures at A, B and C are 400 K, 800 K and 600 K respectively. Choose the correct statement :

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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

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

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?

A system is said to be an isolated system if

Important Questions on Thermodynamics

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