Page 1 - worksheet-2 thermodynamics

Worksheet-2

Thermodynamics

1 It is known that curves A, B, C are Isobaric, Isothermal, Adiabatic process then when one is correct

(a) A - Adiabatic, B - Isothermal,, C - Isobaric
(b) A- Isothermal,, B - Adiabatic, C - Isobaric
(c) A - Isobaric, B - Isothermal C - Adiabatic
(d) None of these
2 (a) Air pressure in a car tyre increases during driving. Why?
(b) The climate of a harbour town is more temperate (i.e., without extremes of heat and cold) than
that of a town in a desert at the same latitude. Why?
3 Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a
gas at standard temperature and pressure. B is completey evacuated. The entire system is
thermally insulated. The stopcock is suddenly opened. What is the final pressure of the gas in A
and B ?
4 A cylinder with a movable piston contains 3 moles of hydrogen at standard temperature and
pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by
having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is
compressed to half its original volume
5 In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium
state B, an amount of work equal to 22.3 J is done on the system. If the gas is taken from state A to
B via a process in which the net heat absorbed by the system is 9.35 cal, how much is the net work
done by the system in the latter case? (Take 1 cal = 4.19 J)
6 What amount of heat must be supplied to 2.0 x 10-2 kg of nitrogen (at room temperature) to raise
its temperature by 45 °C at constant pressure? (Molecular mass of N2 = 28; R = 8.3 J mol-1 K-1.)
7 A geyser heats water flowing at the rate of 3.0 litres per minute from 2 7°C to 77°C. If the geyser
operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is
4.0 x 104 J/g?