NCERT Class 11 Accountancy Part 2 – Hindi Chapter 10: द्रव्य के तापीय गुण PDF

NCERT Class 11 Hindi Medium Chapter 10, द्रव्य के तापीय गुण, explains how different substances behave when heat is supplied to them. The chapter covers concepts like temperature, thermal expansion, heat capacity and change of state. These ideas help students understand everyday phenomena such as why metal rods expand in summer, how thermometers work and why ice melts at a fixed temperature.

I am writing about this chapter because students often find the thermal properties of matter both interesting and confusing. Many of the examples we see every day, like a pressure cooker working faster or railway tracks being laid with small gaps, are based on the concepts explained here. Understanding these ideas early helps students perform well in school exams as well as in competitive exams where basic physics questions are common. With the official NCERT PDF, learners get access to detailed diagrams, solved examples and accurate explanations straight from the standard textbook. My aim is to make the topic feel more approachable so students can study it with confidence.

Overview of Chapter 10: Thermal Properties of Matter

This chapter gives a clear explanation of how solids, liquids and gases respond to changes in temperature. The concepts are supported with practical examples that students can easily relate to.

1. Temperature and Heat

The chapter begins by explaining the difference between heat and temperature. Students also learn:

What thermometers measure
How temperature scales like Celsius, Fahrenheit and Kelvin differ
Why heat flows from a hotter object to a colder one

These basics help students understand thermal behaviour clearly.

2. Thermal Expansion

One of the most important topics in the chapter is how substances expand when heated. It covers:

Linear expansion
Area expansion
Volume expansion

Common examples include:

Gaps between railway tracks
Hot air balloons rising
Lids of tight jars loosening when dipped in hot water

3. Specific Heat Capacity

This section explains how different materials require different amounts of heat to rise in temperature. Students learn:

The meaning of specific heat capacity
Why water has a high specific heat
How this property affects weather, sea breezes and land breezes

The examples make the topic easier to understand.

4. Change of State

Here the chapter discusses melting, boiling and sublimation. Important points include:

Latent heat of fusion
Latent heat of vaporisation
Why ice remains at 0°C while melting

Students understand how heat can change the form of a substance without changing its temperature.

5. Heat Transfer

This topic explains three methods of heat transfer:

Conduction
Convection
Radiation

Everyday examples such as cooking food, ceiling fans cooling a room and the sun warming the earth help students connect theory to real life.

6. Practical Applications

The chapter also discusses the use of thermal properties in:

Thermometers
Heat engines
Refrigerators
Construction of bridges and buildings

These applications show how physics principles are used in engineering and everyday utilities.

How to Download NCERT Class 11 Hindi Chapter 10 PDF

Students can download the official NCERT Class 11 Accountancy Part 2 – Hindi Chapter 10: द्रव्य के तापीय गुण PDF from here.

NCERT Class 11 History Chapter 3 PDF (Hindi): यायावर साम्राज्य

Chapter 3 of Class 11 History (Hindi Medium), यायावर साम्राज्य, introduces us to the powerful nomadic groups who lived on grasslands and shaped world politics through their mobility and warfare skills. Unlike settled civilizations, these groups did not build fixed cities. Instead, they lived in tents, moved across open steppe lands, and controlled vast territories using trained cavalry, swift horses, and disciplined armies. This chapter mainly focuses on the Mongols and the rise of the great leader Genghis Khan, who built one of the largest empires in world history.

The Mongols break this idea completely; they ruled not through stone buildings but with strategy, speed, and unity. They controlled long trade routes like the Silk Road, protected traveling merchants, and brought different cultures in contact with each other. Even though they were feared for their battles, they also encouraged trade, promoted communication, and created connections between Europe and Asia. This chapter helps us realise that history is not only written in monuments, but also in movement, leadership, and cultural exchange. Understanding the nomadic empire changes our view of how societies grow without cities and how mobility can be a source of power.

About Chapter 3: यायावर साम्राज्य

This chapter explains who nomads were, how they lived, how they organized themselves, and how they built one of the most influential empires.

Who Were the Nomads?

Nomads were communities that moved from one place to another instead of settling permanently. They traveled with:

Herds of sheep, horses, goats, camels
Portable tents (known as yurts)
Weapons designed for horseback combat

Rise of Genghis Khan

Genghis Khan, originally named Temujin, united different Mongol tribes and became a legendary leader.

Leader	Contribution
Genghis Khan	United tribes, created military discipline, expanded the empire through conquests
Ögedei Khan	Strengthened administration, continued expansion
Mongke and Kublai Khan	Controlled trade, governed China, expanded diplomacy