A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100 Ω through a current of 1A for 5 min . Then change in internal energy is -
(1) 0 kJ
(2) 10 kJ
(3) 20 kJ
(4) 30 kJ
A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by \(62^{\circ}\mathrm{C}\), the efficiency of the engine is doubled. The temperatures of the source and sink are:
1. \(80^{\circ}\mathrm{C}, 37^{\circ}\mathrm{C}\)
2. \(95^{\circ}\mathrm{C}, 28^{\circ}\mathrm{C}\)
3. \(90^{\circ}\mathrm{C}, 37^{\circ}\mathrm{C}\)
4. \(99^{\circ}\mathrm{C}, 37^{\circ}\mathrm{C}\)
The P-V diagram shows seven curved paths (connected by vertical paths) that can be followed by a gas. Which two of them should be parts of a closed cycle if the net work done by the gas is to be at its maximum value ?
(1) ac
(2) cg
(3) af
(4) cd
An ideal gas of mass m in a state A goes to another state B via three different processes as shown in figure. If Q1, Q2 and Q3 denote the heat absorbed by the gas along the three paths, then -
(1) Q1 < Q2 < Q3
(2) Q1 < Q2 = Q3
(3) Q1 = Q2 > Q3
(4) Q1 > Q2 > Q3
A thermodynamic process is shown in the figure. The pressures and volumes corresponding to some points in the figure are : and . In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be
(1) 560 J
(2) 800 J
(3) 600 J
(4) 640 J
P-V plots for two gases during adiabatic process are shown in the figure. Plots 1 and 2 should correspond respectively to -
(1) He and O2
(2) O2 and He
(3) He and Ar
(4) O2 and N2
A cyclic process ABCD is shown in the P-V diagram. Which of the following P-T curves represent the same process ?
(1)
(2)
(3)
(4)
A cyclic process ABCA is shown in the V-T diagram. Process on the P-V diagram is -
(1)
(2)
(3)
(4)
Heat energy absorbed by a system in going through a cyclic process shown in figure is
(1) 107 π J
(2) 104 π J
(3) 102π J
(4) 10–3π J
A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown in the PV diagram. The net work done during the complete cycle is given by the area
(1) P1ACBP2P1
(2) ACBB'A'A
(3) ACBDA
(4) ADBB'A'A