Which one of the following is correct for one complete cycle of a thermodynamic process on a gas as shown in the \((P-V)\) diagram?

      

1. \(\Delta E_{int}= 0, Q<0\) 2. \(\Delta E_{int}= 0, Q>0\)
3. \(\Delta E_{int}>0, Q<0\) 4. \(\Delta E_{int}< 0, Q>0\)

Subtopic:  Cyclic Process |
 68%
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An ideal gas is taken from point A to the point B, as shown in the P-V diagram. The work done in the process is -

1. (PAPB)(VBVA)

2. 12(PBPA)(VB+VA)

3. 12(PBPA)(VBVA)

4. 12(PB+PA)(VBVA)

Subtopic:  Work Done by a Gas |
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The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from AB C is 30J and 40J heat is given to the system. The change in internal energy between A and C is

(1) 10 J

(2) 70 J

(3) 84 J

(4) 134 J

Subtopic:  First Law of Thermodynamics |
 70%
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Consider a process shown in the figure. During this process the work done by the system -

(1) Continuously increases

(2) Continuously decreases

(3) First increases, then decreases

(4) First decreases, then increases

Subtopic:  Work Done by a Gas |
 51%
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Six moles of an ideal gas perform a cycle shown in figure. If the temperature are TA = 600 K, TB = 800 K, TC = 2200 K and TD = 1200 K, the work done per cycle is -

(1) 20 kJ

(2) 30 kJ

(3) 40 kJ

(4) 60 kJ

Subtopic:  Types of Processes |
 57%
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Which of the accompanying PV diagrams best represents an isothermal process ?

(1)

(2)

(3)

(4)

Subtopic:  Types of Processes |
 85%
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In the following figures, four curves A, B, C and D, are shown. The curves are:

        

1. isothermal for A and D while adiabatic for B and C.
2. adiabatic for A and C while isothermal for B and D.
3. isothermal for A and B while adiabatic for C and D.
4. isothermal for A and C while adiabatic for B and D.
Subtopic:  Types of Processes |
 73%
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P-V diagram of a cyclic process ABCA is as shown in figure. Choose the correct statement

(1) ΔQAB = negative

(2) ΔUBC = positive

(3) ΔWCAB = negative

(4) All of these

Subtopic:  Cyclic Process |
 79%
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A sample of an ideal gas is taken through a cycle a shown in figure. It absorbs 50J of energy during the process AB, no heat during BC, rejects 70J during CA. 40J of work is done on the gas during BC. Internal energy of gas at A is 1500J, the internal energy at C would be

(1) 1590 J

(2) 1620 J

(3) 1540 J

(4) 1570 J

Subtopic:  Cyclic Process |
 55%
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In the following P-V diagram two adiabatics cut two isothermals at temperatures T1 and T2 (fig.). The value of VaVd will be

(1) VbVc

(2) VcVb

(3) VdVa

(4) VbVc

Subtopic:  Types of Processes |
 69%
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