Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 41

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A monoatomic ideal gas, initially at temperature $T_{1}$ , is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_{2}$ by releasing the piston suddenly. If $L_{1}$ and $L_{2}$ are lengths of the gas column before and after expansion respectively, then $\frac{T_{1}}{T_{2}}$ is given by

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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 42

Starting with the same initial conditions, an ideal gas expands from volume

V_{1}

to

V_{2}

in three different ways. The work done by the gas is

W_{1}

if the process is isothermal,

W_{2}

if isobaric and

W_{3}

if adiabatic, 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 43

$A$ and $B$ are two adiabatic curves for two different gases. Then $A$ and $B$ corresponds 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 44

Choose the incorrect statement related to an isobaric process.

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 45

The amount of heat required to raise the temperature of 1 mole of a monoatomic gas from

20 ° C

to

30 ° C

at constant volume is

H

. Then, the amount of heat required to raise the temperature of

2

mole of a diatomic gas from

20 ° C

to

25 ° C

at constant pressure 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 46

Specific heat of gas undergoing adiabatic changes 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 47

During an isothermal expansion of an ideal gas

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 48

Two identical samples of gas are allowed to expand
(i) isothermally
(ii) adiabatically.

Work done 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 49

A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an