Thermodynamics
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NCERT Class 11 Physics Chapter wise Solutions
- 1 – Physical World
- 2 – Units and Measurements
- 3 – Motion in a Straight line
- 4 – Motion in a Plane
- 5 – Laws of Motion
- 6 – Work, Energy and Power
- 7 – System of Particles and Rotational motion
- 8 – Gravitation
- 9 – Mechanical Properties of Solids
- 10 – Mechanical properties of fluids
- 11 – Thermal Properties of matter
- 12 – Thermodynamics
- 13 – Kinetic Theory
- 14 – Oscillations
- 15 – Waves
CHAPTER 12 THERMODYNAMICS
- 12.1 Introduction
- 12.2 Thermal equilibrium
- 12.3 Zeroth law of thermodynamics
- 12.4 Heat, internal energy and work
- 12.5 First law of thermodynamics
- 12.6 Specific heat capacity
- 12.7 Thermodynamic state variables and equation of state
- 12.8 Thermodynamic processes
- 12.9 Heat engines
- 12.10 Refrigerators and heat pumps
- 12.11 Second law of thermodynamics
- 12.12 Reversible and irreversible processes
- 12.13 Carnot engine
NCERT Solutions For Class 11 Physics Thermodynamics
1. A geyser heats water flowing at the rate of 3.0 litres per minute from 27 °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 
J/g?
2. What amount of heat must be supplied to 
kg of nitrogen (at room temperature) to raise its temperature by 45 °C at constant pressure? (Molecular mass of
.)
3. Explain why
(a) Two bodies at different temperatures 
and 
if brought in thermal contact do not necessarily settle to the mean temperature
.
(b) The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.
(c) Air pressure in a car tyre increases during driving.
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude.
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. 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 completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following:
(a) What is the final pressure of the gas in A and B?
(b) What is the change in internal energy of the gas?
(c) What is the change in the temperature of the gas?
(d) Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface?
7. A steam engine delivers 
of work per minute and services 
of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?
8. An electric heater supplies heat to a system at a rate of 100W. If system performs work at a rate of 75 Joules per second. At what rate is the internal energy increasing?
9. A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Fig. (12.13)
Its volume is then reduced to the original value from E to F by an isobaric process. Calculate the total work done by the gas from D to E to F
10. A refrigerator is to maintain eatables kept inside at 9°C. If room temperature is 36° C, calculate the coefficient of performance.