📘 Chapter 10: Thermal Physics – Exercise Short Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus (National Curriculum 2023).
📖 What's Inside: This section covers exercise short questions from the official PECTAA 2026 curriculum: factors affecting thermal expansion, latent heat of fusion, latent heat of vaporization, evaporation cooling, and varying expansion behaviors of different materials. Each answer is presented in the exact exam-ready format.
📚 Related Resources – Chapter 10: Thermal Physics
Exercise short questions help reinforce key thermal physics concepts for board exams.
📖 Exercise Short Questions & Answers (PECTAA 2026)
10.1 What factors influence the thermal expansion of solids?
The thermal expansion of solids depends on the nature of the material and the change in temperature. Different materials expand by different amounts due to their coefficients of expansion.
The thermal expansion of solids depends on the nature of the material and the change in temperature. Different materials expand by different amounts due to their coefficients of expansion.
10.2 What is latent heat of fusion?
Latent heat of fusion is the heat energy required to convert 1 kg of a solid into a liquid at its melting point while keeping the temperature constant.
Latent heat of fusion is calculated as \(Q = mL_{f}\) where \(Q\) is heat, \(m\) is mass, and \(L_{f}\) is latent heat of fusion.
Latent heat of fusion is the heat energy required to convert 1 kg of a solid into a liquid at its melting point while keeping the temperature constant.
Latent heat of fusion is calculated as \(Q = mL_{f}\) where \(Q\) is heat, \(m\) is mass, and \(L_{f}\) is latent heat of fusion.
10.3 How do different materials exhibit varying thermal expansion behaviours?
Different materials exhibit varying thermal expansion because they have different coefficients of expansion, so some expand more than others when heated. For example, metals expand more than glass when heated.
Different materials exhibit varying thermal expansion because they have different coefficients of expansion, so some expand more than others when heated. For example, metals expand more than glass when heated.
10.4 How does evaporation contribute to cooling processes in everyday life?
During evaporation, the molecules that evaporate take away heat from the remaining liquid. This process cools the liquid down because the higher-energy molecules leave, leaving behind cooler molecules. For example, when we sweat, evaporation removes heat from our body and makes us feel cool.
During evaporation, the molecules that evaporate take away heat from the remaining liquid. This process cools the liquid down because the higher-energy molecules leave, leaving behind cooler molecules. For example, when we sweat, evaporation removes heat from our body and makes us feel cool.
10.5 What is latent heat of vaporization, and how is it calculated?
Latent heat of vaporization is the heat energy needed to change 1 kg of a liquid into gas at its boiling point without changing the temperature.
Latent heat of vaporization is calculated as \(Q = mL_{v}\) where \(Q\) is heat, \(m\) is mass, and \(L_{v}\) is latent heat of vaporization.
Latent heat of vaporization is the heat energy needed to change 1 kg of a liquid into gas at its boiling point without changing the temperature.
Latent heat of vaporization is calculated as \(Q = mL_{v}\) where \(Q\) is heat, \(m\) is mass, and \(L_{v}\) is latent heat of vaporization.
📐 Key Formulas – Thermal Physics (Exercise Context)
Latent Heat of Fusion: \( Q = m L_{f} \)
Latent Heat of Vaporization: \( Q = m L_{v} \)
Linear Expansion (General): \( \Delta L = \alpha L_0 \Delta T \)
💡 Exam Tip:
For board exams, precisely define latent heat of fusion/vaporization, mention formulas with units, and give real-life examples. These exercise short questions follow the official PECTAA 2026 pattern and are prepared by Subject Specialist Muhammad Tayyab.
Unit 10✨ Thermal Physics
Unit 11Transfer of Thermal Energy
Unit 12Waves
Unit 13Sound
Unit 14Light
Unit 15Electrostatics
Unit 16Electricity
Unit 17Electromagnetism
Unit 18Electromagnetic Induction & EM Waves
Unit 19Electronics
Unit 20Atomic and Nuclear Physics
Unit 21Space and Environment
📖 Complete syllabus coverage for Class 10 Physics (PECTAA 2026) – Units 10 to 21
Created by Hira Science Academy | Aligned with PECTAA 2026 Syllabus