A container having 1 mole of a gas at a temperature 27oC has a movable piston which maintains a constant pressure of 1 atm in the container. The gas is compressed until the temperature becomes 127oC. The work done (CP for gas is 7.03 J/mol-K) is:
703 J
814 J
121 J
2035 J
Which one is correct ?
In an isobaric process, ΔP = 0
In an isochoric process, ΔW = 0
In an isothermal process, ΔT = 0
In an isothermal process, ΔQ = 0
First law of thermodynamics is a consequence of conservation of:
Work
Energy
Heat
All of these
"Heat cannot itself flow from a body at lower temperature to a body at higher temperature" is a statement related to:
Second law of thermodynamics
Conservation of momentum
Conservation of mass
First law of thermodynamics
100 g of water is heated from 30oC to 50oC. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)
4.2 kJ
8.4 kJ
84 kJ
2.1 kJ
An ideal gas is compressed adiabatically to 8/27 times of its present value at 27oC. The temperature of the gas becomes: (γ= 5/3).
475oC
275oC
402oC
175oC
Which of the following parameters does not characterize the thermodynamic state of matter ?
Temperature
Pressure
Volume
The efficiency of a Carnot engine is 50% and temperature of the sink is 500 K. If the temperature of source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink will be:
600 K
500 K
400 K
100 K
An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62oC, its efficiency is doubled. The temperature of the source is:
124oC
37oC
62oC
99oC
An ideal monoatomic gas is taken around the cycle ABCDA as shown in the PV diagram. The work done during the cycle is given by:
1/2 PV
PV
2 PV
4 PV
