10th Class Physics Definitions 2026

Q: Why do board exams ask for exact definitions?

Physics definitions are precise statements of a law, quantity, or concept. Board examiners award marks for definitions that include every required part — such as the quantity being defined, its formula where relevant, and its SI unit — so exact wording matters.

Q: Are these definitions the same across all Punjab boards?

Yes. Since all BISE Punjab boards use the same PECTAA National Curriculum 2023 textbook for 2026, the accepted definitions are consistent across Lahore, Gujranwala, Faisalabad, Multan, Rawalpindi, Bahawalpur, Sargodha, Dera Ghazi Khan, and Sahiwal boards.

10th Class Physics Definitions (2026 PECTAA Edition)

This page organises every important 10th Class Physics Definition from the PECTAA (National Curriculum 2023) textbook, chapter by chapter, prepared by Muhammad Tayyab, Subject Specialist Physics at Govt. Christian High School Daska. Each definition is written in the exact, board-accepted wording examiners expect to see in a Class 10 Physics answer.

Definitions carry easy marks in the board exam, but only if the wording is precise — a vague or partial definition often loses marks even when the underlying idea is understood. This page is built for quick, repeated review so the exact phrasing becomes second nature before exam day.

Pair this page with the Physics Formulas sheet for a complete "concept plus calculation" revision set, or head back to the 10th Class Physics Notes hub for full chapter explanations.

Chapter-Wise Definitions

Open any chapter for its key scientific terms and board-accepted definitions.

📖 Prepared by Muhammad Tayyab

🔥

Chapter 10 – Thermal Physics

Definitions: Thermal Physics

New 2026↑

Key terms including heat, temperature, thermal expansion, specific heat capacity, and latent heat.

🌟 Open Chapter Definitions

📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

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Chapter 11 – Transfer of Thermal Energy

Definitions: Transfer of Thermal Energy

New 2026↓

🌟 Open Chapter Definitions

📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

🌊

Chapter 12 – Waves

Definitions: Waves

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🌟 Open Chapter Definitions

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🌟 Chapter Hub ✅ MCQs

🎵

Chapter 13 – Sound

Definitions: Sound

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📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

💡

Chapter 14 – Light

Definitions: Light

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📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

⚡

Chapter 15 – Electrostatics

Definitions: Electrostatics

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🌟 Chapter Hub ✅ MCQs

🔌

Chapter 16 – Electricity

Definitions: Electricity

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🌟 Chapter Hub ✅ MCQs

🧲

Chapter 17 – Electromagnetism

Definitions: Electromagnetism

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📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

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Chapter 18 – Electromagnetic Induction & EM Waves

Definitions: Electromagnetic Induction

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🌟 Open Chapter Definitions

📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

💻

Chapter 19 – Electronics

Definitions: Electronics

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📌 QUICK LINKS

🌟 Chapter Hub ✅ MCQs

☢️

Chapter 20 – Atomic and Nuclear Physics

Definitions: Atomic and Nuclear Physics

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🌟 Chapter Hub ✅ MCQs

🪐

Chapter 21 – Space and Environment

Definitions: Space and Environment

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🌟 Open Chapter Definitions

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🌟 Chapter Hub ✅ MCQs

📖 Why Exact Wording Matters

A Physics definition is a compact, technical statement, and board examiners check it against a specific marking scheme. Missing a key phrase — such as the unit, the condition under which a law applies, or the exact quantity being described — can cost a mark even if you clearly understand the concept.

🔑 Key Concepts

The fundamental quantities and laws each chapter introduces, defined precisely.

📐 Quick Revision

Definitions grouped by chapter for fast, repeated review in the days before an exam.

🎯 Exam Preparation

Wording aligned with what BISE Punjab examiners expect in short-answer responses.

🧠 Scientific Terms

Every important term introduced across all 12 chapters, from thermal physics to space and environment.

💡 A Quick Revision Method for Definitions

Memorising definitions works best in short, repeated sessions rather than one long read-through. Try this approach for each chapter.

1️⃣ Read the Definition Aloud

Saying it aloud helps you notice missing words compared to writing it silently.

2️⃣ Write It From Memory

Cover the page and write the definition yourself, then compare word by word.

3️⃣ Link It to the Formula

Check the matching entry on the Formula Sheet so the definition and calculation reinforce each other.

4️⃣ Revisit After a Day

Spaced repetition — reviewing again after a day or two — makes definitions stick far better than a single pass.

❓ Frequently Asked Questions

Why do board exams ask for exact definitions?

Definitions are precise statements, and examiners award marks for the required parts — the quantity, its formula where relevant, and its SI unit — so exact wording matters.

Are these definitions the same across all Punjab boards?

Yes. All BISE Punjab boards use the same PECTAA National Curriculum 2023 textbook for 2026, so accepted definitions are consistent across boards.

How many definitions should I memorise per chapter?

Focus first on definitions tied to the chapter's core quantities and laws, since these are tested most frequently.

Do definitions cover all 12 chapters of the syllabus?

Yes, from Chapter 10 (Thermal Physics) through Chapter 21 (Space and Environment).

How should I use this page alongside the Formula Sheet?

Definitions explain what a quantity means, while the Formula Sheet shows how to calculate it — reviewing both together gives complete, exam-ready understanding.

10th Class Physics Definitions