An ideal monoatomic gas is taken round the cycle  as shown in following P-V diagram. The work done during the cycle is -

(1) PV

(2) 2 PV

(3) 4 PV

(4) Zero

Subtopic:  Work Done by a Gas |
 78%
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A system changes from the state (P1, V1) to (P2, V2) as shown in the figure. What is the work done by the system ?

(1) 7.5 × 105 joule

(2) 7.5 × 105 erg

(3) 12 × 105 joule

(4) 6 × 105 joule

Subtopic:  Work Done by a Gas |
 79%
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Carbon monoxide is carried around a closed cycle abc in which bc is an isothermal process as shown in the figure. The gas absorbs 7000 J of heat as its temperature increases from 300 K to 1000 K in going from a to b. The quantity of heat rejected by the gas during the process ca is -

(1) 4200 J

(2) 5000 J

(3) 9000 J

(4) 9800 J

Subtopic:  Cyclic Process |
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When a system is taken from state i to a state f along path iaf, Q = 50 J and W = 20 J. Along path ibf, Q = 35 J. If W = –13 J for the curved return path f i, Q for this path is

(1) 33 J

(2) 23 J

(3) – 7 J

(4) – 43 J

Subtopic:  First Law of Thermodynamics |
 62%
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An ideal gas is taken from point A to 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 |
 52%
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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 |
 53%
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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 |
 61%
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In the following figure, 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 |
 72%
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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 |
 86%
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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 |
 73%
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