Temperature is defined by

1.  First Law of thermodynamics

2.  Second Law of thermodynamics

3.  Third Law of  thermodynamics

4.  Zeroth Law of  thermodynamics

 

Concept Questions :-

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The P-V diagram for a thermodynamic system is shown in the figure. The work done by the system during the cyclic process ABCA is

           

1.  Zero

2.  90 J

3.  30 J

4.  60 J

Concept Questions :-

Work done by gas
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If 32 gm of O2 at 27°C is mixed with 64 gm of O2 at 327°C in an adiabatic vessel, then the final temperature of the mixture will be :

1.  200°C

2.  227°C

3.  314.5°C

4.  235.5°C

Concept Questions :-

Molar Specific heat
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If W1 is the work done in compressing an ideal gas from a given initial state through a certain volume isothermally and W2 is the work done in compressing the same gas from the same initial state through the same volume adiabatically, then:

(1) W1=W2

(2) W1<W2

(3) W1>W2

(4) W1=2W2

Concept Questions :-

Work done by gas
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An ideal gas changes from state 'a' to state 'b' as shown in figure. What is the work done by the gas in the process?

1. zero

2. positive

3. negative

4. infinite

Concept Questions :-

Work done by gas
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P-V graph of two gases during adiabatic processes are shown in figure. Plots 1 and 2 should correspond, respectively to :

1. He, O2

2. O2 and He

3. He and Ar

4. O2 and N2

Concept Questions :-

Molar Specific heat
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For an ideal gas V-T curves at constant pressure P1 and P2 are shown in figure. From the figure

1. P1>P2

2. P1<P2

3. P1=P2

4. P1P2

Concept Questions :-

Types of processes
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During an experiment and ideal gas is found to obey an additional law VP2=constant. The gas is initially at a temperature T and volume V. When it expand to a volume 2V, the temperature becomes.

(1) T

(2) 2T

(3) T2

(4) T/2

Concept Questions :-

Types of processes
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A Carnot engine working between 400K and 800K has a work output of 900J per cycle. The amount of heat energy supplied to engine from the source per cycle is

1.  900 J

2.  1800 J

3.  450 J

4.  2700 J

  

Concept Questions :-

Heat engine and refrigerator
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An ideal gas with adiabatic exponent y is heated at constant pressure and it absorbs Q heat. What fraction of this heat is used to perform external work

1.  γ

2.  γγ

3.  1 - 1γ

4.  γ - 1

Concept Questions :-

Types of processes
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