# NCERT solutions for Class 11 Physics chapter 12 - Thermodynamics [Latest edition]

#### Chapters ## Solutions for Chapter 12: Thermodynamics

Below listed, you can find solutions for Chapter 12 of CBSE NCERT for Class 11 Physics.

Exercises
Exercises [Pages 316 - 317]

### NCERT solutions for Class 11 Physics Chapter 12 Thermodynamics Exercises [Pages 316 - 317]

Exercises | Q 1 | Page 316

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 4.0 × 104 J/g?

Exercises | Q 2 | Page 316

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.)

Exercises | Q 3.1 | Page 316

Explain why Two bodies at different temperatures T1 and T2, if brought in thermal contact, do not necessarily settle to the mean temperature (T1 + T2)/2.

Exercises | Q 3.2 | Page 316

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.

Exercises | Q 3.3 | Page 316

Explain why Air pressure in a car tyre increases during driving.

Exercises | Q 3.4 | Page 316

Explain why The climate of a harbour town is more temperate than that of a town in a desert at the same latitude.

Exercises | Q 4 | Page 316

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?

Exercises | Q 5 | Page 316

In changing the state of a gas adiabatically from an equilibrium state 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 to 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)

Exercises | Q 6.1 | Page 316

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:

What is the final pressure of the gas in A and B?

Exercises | Q 6.2 | Page 316

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:

What is the change in internal energy of the gas?

Exercises | Q 6.3 | Page 316

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:

What is the change in the temperature of the gas?

Exercises | Q 6.4 | Page 316

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:

Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface?

Exercises | Q 7 | Page 317

A steam engine delivers 5.4×10J of work per minute and services 3.6 × 10J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

Exercises | Q 8 | Page 317

An electric heater supplies heat to a system at a rate of 100W. If the system performs work at a rate of 75 Joules per second. At what rate is the internal energy increasing?

Exercises | Q 9 | Page 317

A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Figure 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

Exercises | Q 10 | Page 317

A refrigerator is to maintain eatables kept inside at 9°C. If the room temperature is 36° C, calculate the coefficient of performance.

## Solutions for Chapter 12: Thermodynamics

Exercises ## NCERT solutions for Class 11 Physics chapter 12 - Thermodynamics

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Concepts covered in Class 11 Physics chapter 12 Thermodynamics are Isothermal Processes, Adiabatic Processes, Thermal Equilibrium, Zeroth Law of Thermodynamics, Heat, Internal Energy and Work, First Law of Thermodynamics, Thermodynamic State Variables and Equation of State, Specific Heat Capacity, Thermodynamic Process, Heat Engine, Refrigerators and Heat Pumps, Second Law of Thermodynamics, Reversible and Irreversible Processes, Carnot Engine.

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