Class 11 Physics Chapter 10 Questions and Answers - Free PDF Download
FAQs on NCERT Solutions For Class 11 Physics Chapter 10 Thermal Properties of Matter - 2025-26
1. Are heat and temperature the same concept in Physics?
No, heat is the total thermal energy in a substance, while temperature measures the average kinetic energy of its molecules. The common confusion arises because adding heat often increases temperature. For example, a bucket of lukewarm water has more total heat than a small cup of boiling water.
2. Does the temperature of a substance always change when you add heat?
No, temperature remains constant during a phase change, like melting or boiling. The added energy, called latent heat, is used to change the substance's state (e.g., solid to liquid) instead of increasing its temperature. This is why water boils at a steady 100°C.
3. Is a perfect black body always black in colour?
No, a perfect black body is an ideal object that absorbs all radiation, but it is also a perfect emitter when heated. A common misconception is that it must look black. For instance, a hot electric filament, which behaves like a black body, glows bright white or red.
4. Are NCERT Solutions for Class 11 Physics Chapter 10 just for homework?
No, these solutions are a powerful self-study tool for clarifying the correct problem-solving methods and clearing conceptual doubts. They build a strong foundation for exams by helping you check your own work, going far beyond just homework completion.
5. Does the Thermal Properties of Matter NCERT PDF only contain answers to chapter-end exercises?
No, a complete solutions PDF also includes detailed answers for all in-text questions and additional exercises. This ensures you can practice and verify your understanding as you progress through the chapter, not just after you have finished reading it.
6. Do all substances expand when they are heated?
No, not all substances expand uniformly upon heating; water is a famous exception. While most materials expand when heated, water contracts when its temperature is raised from 0°C to 4°C, reaching its maximum density at 4°C. After 4°C, it begins to expand normally.
This misconception arises from generalizing the behaviour of common solids and liquids. The anomalous behaviour of water is due to the unique hydrogen bonding structure in its solid and cold liquid forms. As ice melts and warms to 4°C, its open cage-like structure collapses, allowing molecules to pack more closely.
This property is crucial for aquatic life. In a lake, as surface water cools below 4°C, it becomes less dense and stays on top, freezing to form an insulating layer of ice that protects the liquid water and life below.
7. Is Thermal Properties of Matter an important chapter for NEET?
Yes, Thermal Properties of Matter is a very important chapter for competitive exams like NEET. It is part of the larger 'Thermal Physics' unit, which consistently carries significant weightage. You can typically expect 3-5 questions from the combined topics of this chapter, Thermodynamics, and Kinetic Theory.
The myth that it can be skipped often comes from its theoretical sections, but NEET frequently tests direct, formula-based numericals. Common questions involve calorimetry, thermal expansion, and the three modes of heat transfer (conduction, convection, radiation).
Using the **Thermal Properties of Matter Class 11 ncert solutions** is an excellent strategy to master these numericals. They provide clear, step-by-step applications of key formulas like Stefan's Law (P = σeAT⁴) and Newton's Law of Cooling, which are frequently tested.
Mastering NCERT-level questions builds the core speed and accuracy needed for competitive exams.
8. What is inside the NCERT Solutions for Class 11 Physics Chapter 10 PDF?
NCERT Solutions for this chapter offer far more than just final answers. They provide detailed, step-by-step explanations for every question in the NCERT textbook, which includes both the main chapter-end exercises and the in-text questions.
Many students mistakenly believe these are simple answer keys. However, the solutions provided by Vedantu are crafted by subject experts to explain the 'why' behind each step, clarifying the application of formulas like Q = mcΔT and principles of calorimetry. They also highlight common mistakes students make.
You can find these resources as a **Free PDF**, making them easy to download and use offline for focused study. This **Thermal Properties of Matter ncert pdf** includes all solved numericals, theoretical question answers, and necessary diagrams for a complete understanding.
This makes the solutions ideal for self-assessment, exam revision, and clearing conceptual doubts efficiently.
9. Is thermal properties of matter a hard chapter?
This chapter is generally considered to be of moderate difficulty, not exceptionally hard. Its concepts, from heat and temperature to thermal expansion and heat transfer, follow a logical progression.
The perception of difficulty often stems from the variety of new formulas and the need to apply them correctly in numerical problems. Students can mix up specific heat capacity with latent heat or misapply equations for conduction and radiation if their foundation is not solid.
A reliable way to overcome this is by regularly solving the **Class 11 Physics Chapter 10 question answer** sets. By working through problems step-by-step, you learn to identify the physical process—heating, phase change, or heat transfer—and select the correct formula, such as Q = mL for a phase change or H = kA(T₁ - T₂)/d for conduction.
With systematic practice using quality solutions, this chapter becomes straightforward and high-scoring.
10. Does heat conduction only happen in solids?
No, heat conduction occurs in solids, liquids, and gases, although it is most efficient in solids. The myth that it's exclusive to solids is common because metals are the most frequently cited examples of good conductors.
Conduction is heat transfer through direct molecular collisions without any bulk movement of the substance. In solids, especially metals, the vibration of tightly packed atoms and the movement of free electrons transfer energy rapidly. In liquids and gases, molecules are farther apart, so collisions are less frequent, making them poorer conductors.
For example, while convection is the dominant mode of heat transfer in water, some conduction still occurs. Gases like air are very poor conductors (insulators), which is why layered clothing works well to keep you warm. Mercury, a liquid metal, is an exception and is a good conductor of heat.
11. Does a hot object cool down at a constant rate?
No, an object's rate of cooling is not constant; it cools fastest when it is hottest and slows down as it approaches the temperature of its surroundings. This is explained by Newton's Law of Cooling, which states the rate of heat loss is proportional to the temperature difference between the object and its environment.
The misconception of a constant cooling rate is an oversimplification. We observe things cooling down but don't typically notice that the rate of cooling changes over time.
For example, a cup of coffee at 90°C in a 20°C room loses heat much more rapidly in the first five minutes than it does when it has cooled to 40°C. The cooling curve is exponential, not a straight line. This principle is key to solving many **Thermal Properties of Matter questions and answers Class 11** related to cooling phenomena.

















