9th Class Physics Chapter 1 | PTCB 2025 New Syllabus | Physical & Non-Physical Quantities Explained

9th Class Physics Chapter 1 | PTCB 2025 New Syllabus | Physical & Non-Physical Quantities Explained

Topic 1.1 Physical and Non-Physical Quantities:

PTCB 9th Class Physics Chapter 1 | New Syllabus 2025 | Complete Learning Guide

🌟 Introduction

Look around you right now — a table, a clock, maybe a cup of tea ☕.
Some of these things can be measured using tools, while others cannot.
This difference helps us understand Physical and Non-Physical Quantities — the foundation of Physics Chapter 1 (PTCB 2025).

📊 What Are Physical Quantities?

Physical quantities are things that can be measured using scientific instruments.

✅ Examples

• Length 📏 — measured with a ruler

• Time ⏰ — measured with a clock

• Temperature 🌡️ — measured with a thermometer

• Weight ⚖️ — measured with a scale

🎯 Key Points

✔️ Can be measured with instruments
✔️ Have numerical values and units (5 meters, 10 seconds)
✔️ Are the same for everyone
✔️ Foundation of all scientific studies

💭 What Are Non-Physical Quantities?

Non-physical quantities are things that cannot be measured with tools or instruments.

✅ Examples

• Love ❤️ — care or affection

• Beauty 🌺 — attractiveness based on opinion

• Fear 😨 — emotional response

• Happiness 😊 — emotional state

• Wisdom 🧠 — understanding or knowledge

🎯 Key Points

✔️ Cannot be measured
✔️ No units or numerical values
✔️ Differ from person to person
✔️ Based on emotions or thoughts

🔍 Comparison Table

Physical Quantities 📐 Non-Physical Quantities 💖 Can be measured Cannot be measured Use instruments No instruments Same for everyone Different for everyone Example: 2 meters Example: Beautiful

🌍 Example 1: Going to School 🎒

Measurable (Physical):

• 📏 Distance: 2 km

• ⏰ Time: 15 min

• 🌡️ Temperature: 30°C

• 🚲 Speed: 8 km/h

Non-Measurable (Non-Physical):

• 😊 Happiness seeing friends

• 😰 Nervousness before exam

• 💪 Confidence while answering

• ❤️ Love for your teacher

🍰 Example 2: Baking a Cake 🎂

Measurable (Physical):

• ⚖️ Flour: 500 g

• 🥛 Milk: 200 ml

• ⏱️ Baking time: 30 min

• 🌡️ Oven temp: 180°C

Non-Measurable (Non-Physical):

• 😋 Taste — subjective

• 🎨 Appearance — opinion-based

• 😊 Joy of sharing

• 💖 Love in making

🎯 Why Both Are Important

Physical Quantities help us:

• Build things 🏗️

• Perform experiments 🔬

• Make scientific predictions 📊

Non-Physical Quantities help us:

• Feel emotions 💭

• Appreciate beauty 🌸

• Build relationships 🤝

✨ Final Thought

We can measure the length of a hug, but not the love in it. ❤️
Both matter — one for science, one for life.

“Not everything that counts can be counted, and not everything that can be counted, counts.” 💫

📝 Quiz Solution: Physical vs Non-Physical Quantities ✅ Complete Answer Table

Feature Physical Quantity Non-Physical Quantity Measurement possible ✅ Yes ❌ No Instruments used ✅ Yes (ruler, clock, etc.) ❌ No Have units & numbers ✅ Yes (5 m, 10 s) ❌ No Examples Length, Time, Temperature, Mass Love, Beauty, Fear, Happiness

📚 Detailed Explanation 1️⃣ Measurement

• Physical Quantity: Measurable ✅

• Non-Physical Quantity: Not measurable ❌

2️⃣ Instruments

• Physical: Ruler 📏, Clock ⏰, Thermometer 🌡️, Scale ⚖️

• Non-Physical: No tools available

3️⃣ Numbers and Units

• Physical: Have numeric values (50 kg, 37°C)

• Non-Physical: Only descriptive words (“very happy”)

4️⃣ Examples

Physical Quantities:

• Length 📏

• Time ⏰

• Temperature 🌡️

• Weight ⚖️

Non-Physical Quantities:

• Love ❤️

• Beauty 🌺

• Fear 😨

• Happiness 😊

🎯 Quick Memory Tip

“If you can put a NUMBER on it, it’s PHYSICAL!
If it’s a FEELING, it’s NON-PHYSICAL!” 💡

❓ Quick Quiz

Question:
Is a non-physical quantity has dimensions?

Answer:
❌ No.
A non-physical quantity has no dimensions because it cannot be measured using any physical unit or instrument.





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