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The Zeroth law of thermodynamics leads to the concept of

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Important Questions on Thermodynamics

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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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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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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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HARD

Three different processes that can occur in an ideal monoatomic gas are shown in the P vs V diagram. The paths are labelled as AB,AC and AD. The change in internal energies during these process are taken as EAB,EAC and EAD and the work done as WAB,WAC and WAD. The correct relation between these parameters are:

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n moles of an ideal gas undergoes a process AB as shown in the figure. The maximum temperature of the gas during the process will be:
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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?
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A closed tank has two compartments A and B, both filled with oxygen (assumed to be ideal gas). The partition separating the two compartments is fixed and is a perfect heat insulator (Figure1). If the old partition is replaced by a new partition which can slide and conduct heat but does not allow the gas to leak across (Figure 2), the volume (in m3) of the compartment A after the system attains equilibrium is 20x m3. Write the value of x.

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HARD
A certain liquid has a melting point of -50°C and a boiling point of 150°C. A thermometer is designed with this liquid and its melting and boiling points are designated at 0°L and 100°L. The melting and boiling points of water on this scale are
 
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The expression for thermoemf in a thermocouple is given by the relation E=40 θ-θ220 , when θ is the temperature difference of two junctions. For this, the neutral temperature will be
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Write down the body temperature of a healthy person.
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One junction of a certain thermoelectric couple is at a fixed temperature Tr, and the other junction is at temperature T. The thermo-electromotive force for this is expressed byE=KT-TrT0-12(T+Tr). At temperature T=12T0, the thermoelectric power is, 
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Convert 40° C to the (a) Fahrenheit scale (b) Kelvin Scale.
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Write down the temperature of the lower fixed point, on the Fahrenheit scale.
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What is the change in the temperature on Fahrenheit scale and on Kelvin scale, if an iron piece is heated from 30°C to 90°C?
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The triple points of neon and carbon dioxide are 24.57 K and 216.55 K respectively. Express these temperatures on the Celsius and Fahrenheit scales.
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One junction of a thermocouple is at a particular temperature Tr and another is at T. Its thermo EMF is expressed as E=kT-Tr{T0-12T+Tr}.
At temperature T=T02, the value of thermo electric power will be,
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What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale?

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The point on the pressure-temperature phase diagram where all the three phases co-exist is called
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How is the size of a degree defined on a Fahrenheit scale?
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The temperature rises by 18° F. What is the rise on the Celsius scale ?