CBSE
The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by 7°C. The gas is (R= 8.3J mol-1 K-1 )
diatomic
triatomic
a mixture of monoatomic and diatomic
monoatomic
A perfect gas is found to obey the relation PV3/2 = constant during an adiabatic process. If such a gas initially at a temperature T, is compressed to half of its initial volume, then its final temperature will be :
2 T
4T
(2)1/2 T
2 (2)1/2 T
In isothermal process, which of the following is not true?
Temperature remains constant
Internal energy does not change
No heat enters or leaves the system
none of the above
A monoatomic gas supplied the heat Q very slowly keeping the pressure constant. The work done by the gas will be
A body of specific heat 0.2 kcal/ kg° C is heated through 100°C. The percentage increase in its mass is
9%
9.3×10-11 %
10%
None of these
Which of the following processes is reversible?
Transfer of heat by radiation
Electrical heating of a nichrome wire
Transfer of heat by conduction
Isothermal compression
Which of the following parameters does not characterise the thermodynamic state of matter?
Temperature
Pressure
Work
Volume
We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true?
ΔU = -W in an adiabatic process
ΔU = W in an isothermal process
ΔU = -W in an isothermal process
ΔU = W in an adiabtic process
An ideal gas heat engine operates in Carnot cycle between 227o C and 127o C. It absorbs 6 × 104 cal of heat at higher temperature. Amount of heat converted to work is
2.4 × 104 cal
6 × 104 cal
1.2 × 104
4.8 × 104 cal
A raft of wood of mass 120 kg floats in water. The weight that can be put on the raft to make it just sink, should be (d raft = 600 kg/m3)
80 kg
50 kg
60 kg
30 kg