β Chapter 10: Thermal Physics β Multiple Choice Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus (National Curriculum 2023).
π What's Inside: This section covers multiple choice questions from the official PECTAA 2026 curriculum: thermal expansion, coefficient of linear expansion, evaporation, specific heat capacity, and high-temperature superconductors. Each question includes four options and a detailed explanation for the correct answer.
π Related Resources β Chapter 10: Thermal Physics
π Short Questions
π Exercise Short Qs
βοΈ Constructed Response
π Long Questions
π Numerical Problems
Practice MCQs to test your understanding of thermal physics concepts for board exams.
π Multiple Choice Questions & Answers (PECTAA 2026)
10.1 When the temperature of a rod of copper is increased, its length:
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Correct Answer: B. increases
Explanation: Thermal expansion occurs because atoms vibrate more vigorously and push further apart as temperature rises. Therefore, the length of the copper rod increases.
Explanation: Thermal expansion occurs because atoms vibrate more vigorously and push further apart as temperature rises. Therefore, the length of the copper rod increases.
10.2 The amount by which unit length of a material increases when the temperature is raised to 1Β°C, is called the coefficient of:
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Correct Answer: C. linear expansion
Explanation: Linear expansion Ξ± specifically refers to the fractional change in length per unit length per degree change in temperature. Mathematically, Ξ± = ΞL / (Lβ ΞT).
Explanation: Linear expansion Ξ± specifically refers to the fractional change in length per unit length per degree change in temperature. Mathematically, Ξ± = ΞL / (Lβ ΞT).
10.3 What does a liquid turn into once it is evaporated?
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Correct Answer: D. Both (A) and (B)
Explanation: Evaporation turns a liquid into its gaseous state. In the case of water, the gas is specifically referred to as water vapor, which is a form of gas.
Explanation: Evaporation turns a liquid into its gaseous state. In the case of water, the gas is specifically referred to as water vapor, which is a form of gas.
10.4 Which property determines how much heat a solid can absorb before its temperature changes significantly?
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Correct Answer: B. Specific heat capacity
Explanation: Specific heat capacity (c) is defined as the heat required to raise the temperature of 1 kg of a substance by 1Β°C. A higher specific heat capacity means the substance can absorb more heat with a smaller temperature change.
Explanation: Specific heat capacity (c) is defined as the heat required to raise the temperature of 1 kg of a substance by 1Β°C. A higher specific heat capacity means the substance can absorb more heat with a smaller temperature change.
10.5 High-temperature superconductors typically involve which type of material?
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Correct Answer: C. Ceramics
Explanation: While traditional superconductors are metals, "high-temperature" superconductors discovered in the late 1980s are typically ceramic materials (cuprates) that exhibit superconductivity at much higher temperatures.
Explanation: While traditional superconductors are metals, "high-temperature" superconductors discovered in the late 1980s are typically ceramic materials (cuprates) that exhibit superconductivity at much higher temperatures.
π Key Concepts Covered in MCQs
Linear Thermal Expansion: \( \Delta L = \alpha L_0 \Delta T \)
Specific Heat Capacity: \( Q = mc\Delta T \)
Evaporation: Liquid β Gas (vapor) at surface
π‘ Exam Tip:
For MCQs, focus on key definitions and formulas. Remember that coefficient of linear expansion relates to length change, while specific heat capacity relates to heat absorption. High-temperature superconductors are typically ceramic materials, not pure metals.
Unit 10β¨ 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
π Complete syllabus coverage for Class 10 Physics (PECTAA 2026) β Units 10 to 21
Created by Hira Science Academy | Aligned with PECTAA 2026 Syllabus