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Identify the graph(s) which correctly represents an isotherm at two temperatures $T_{1}$ and $T_{2} (> T_{1})$

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Important Questions on The First Law of Thermodynamics

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 80

Two pistons can move freely inside a horizontal cylinder having two sections of unequal cross-sections. The pistons are joined by an inextensible, light string and some gas is enclosed between the pistons. On heating the system, the piston will

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 81

Two different masses of a gas

m

and

2 m

are heated separately in vessels of equal volume. The

T - p

curve for mass

2 m

makes angle an

α

with

T

-axis and that for mass

m

takes angle an

β

with

T

-axis then

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 82

An ideal gas mixture filled inside a balloon expands according to the relation

p V^{\frac{2}{3}} =

constant. The temperature inside the balloon is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 83

A container of volume

1 m^{3}

is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at

300 K

. The other compartment is vacuum. The whole system is thermally isolated from its surroundings. The partition is removed in the gas container. Its temperature now would be

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 84

One mole of helium is adiabatically expanded from its initial state

(p_{i}, V_{i}, T_{i})

to its final state

(p_{f}, V_{f}, T_{f})

. The decrease in the internal energy associated with this expansion is equal to

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 85

One mole of a perfect gas in a cylinder fitted with a piston has a pressure

p,

volume

V

and temperature

T

. If the temperature is increased by

1 K

keeping pressure constant, then increase in volume is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 86

Unit mass of a liquid with volume

V_{1}

is completely changed into a gas of volume

V_{2}

at a constant external pressure

p

and temperature

T

. If the latent heat of evaporation is

L

, then the increase in the internal energy item is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 88

A cylindrical tube of uniform cross-sectional area $A$ is fitted with two airtight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially, the pressure of the gas is $p_{0}$ and temperature is $T_{0}$ , atmospheric pressure is also $p_{0}$ . Now, the temperature of the gas is increased to $2 T_{0}$ , then the tension in the wire will be

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Identify the graph(s) which correctly represents an isotherm at two temperatures T1 and T2>T1

Important Questions on The First Law of Thermodynamics

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Identify the graph(s) which correctly represents an isotherm at two temperatures $T_{1}$ and $T_{2} (> T_{1})$