🧲 CBSE Class 9 Science – Chapter 9: Gravitation गुरुत्वाकर्षण📚 English + Hindi Full Notes, MCQs, FAQs – By BASTRONAUTWAY

🧲 CBSE Class 9 Science – Chapter 9 Gravitation गुरुत्वाकर्षण📚 English + Hindi Full Notes, MCQs, FAQs – By BASTRONAUTWAY
SirBikramSutradhar bAstronautWay Grandmaster Bikram sutradhar Chapter 9: Gravitation गुरुत्वाकर्षण CBSE
👨🏫 Prepared by Grandmaster Bikram Sutradhar | SirBikramSutradhar
📑
CBSE Class 9 Science Chapter 9 – Gravitation (Full Notes + MCQs + FAQs in Bilingual Format)
Gravitation Class 9 Notes, Universal Law of Gravitation, Free Fall, CBSE Class 9 Science Chapter 9, Bilingual Notes, Hindi English, Grandmaster Bikram Sutradhar, BASTRONAUTWAY
Explore CBSE Class 9 Science Chapter 9: Gravitation with complete bilingual notes, MCQs, and FAQs. Learn key concepts like universal gravitation, free fall, Archimedes’ principle with Grandmaster Bikram Sutradhar only at BASTRONAUTWAY.
📘 Chapter Introduction – English
In Chapter 9: Gravitation, we explore the invisible force that holds the universe together – gravity. It explains why apples fall, why planets orbit the Sun, and how fluids exert pressure..
📘 अध्याय की प्रस्तावना – हिंदी
अध्याय 10: गुरुत्वाकर्षण में हम उस अदृश्य बल को समझते हैं जो पूरे ब्रह्मांड को एक साथ बाँधे रखता है – गुरुत्वाकर्षण। यही वह बल है जिसकी वजह से सेब गिरता है, ग्रह सूर्य की परिक्रमा करते हैं, और द्रव दाब उत्पन्न करते हैं। इस अध्याय में हम पढ़ते हैं: न्यूटन का सार्वत्रिक गुरुत्वाकर्षण नियम, मुक्त पतन, द्रव्यमान बनाम भार, उथलता, प्रेरक बल, दाब, आर्किमिडीज़ सिद्धांत और आपेक्षिक घनत्व।
✅ Key Concepts / मुख्य विषय
📌 English:
- Gravitation and Universal Law of Gravitation
- Mass and Weight
- Thrust and Pressure
- Buoyancy and Archimedes’ Principle
- Relative Density

📌 हिंदी में:
- गुरुत्वाकर्षण और सार्वत्रिक गुरुत्वाकर्षण का नियम
- मुक्त पतन और गुरुत्वजनित त्वरण (g)
- द्रव्यमान और भार
- प्रेरक बल और दाब
- उथलता और आर्किमिडीज़ का सिद्धांत
- आपेक्षिक घनत्व









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📖 Sample Bilingual MCQs (Multiple Choice Questions)
Q1. What is the acceleration due to gravity on Earth?
🔘 (a) 8.9 m/s²
🔘 ✅ (b) 9.8 m/s²
🔘 (c) 10.2 m/s²
🔘 (d) 9.2 m/s²
💬 Answer: (b) 9.8 m/s² – It is the standard value on Earth’s surface.
प्रश्न 1: पृथ्वी पर गुरुत्वजनित त्वरण कितना होता है?
🔘 (a) 8.9 m/s²
🔘 ✅ (b) 9.8 m/s²
🔘 (c) 10.2 m/s²
🔘 (d) 9.2 m/s²
💬 (b) 9.8 m/s²
Q2. Which principle explains floating of objects in fluid?
🔘 (a) Newton’s Law
🔘 ✅ (b) Archimedes’ Principle
🔘 (c) Pascal’s Law
🔘 (d) Bernoulli’s Principle
💬 Answer: (b) Archimedes’ Principle – The buoyant force equals weight of fluid displaced.
प्रश्न 2: तरल में वस्तुओं के तैरने को कौन-सा सिद्धांत समझाता है?
🔘 (a) न्यूटन का नियम
🔘 ✅ (b) आर्किमिडीज़ का सिद्धांत
🔘 (c) पास्कल का नियम
🔘 (d) बर्नौली का सिद्धांत
💬 उत्तर: (b) आर्किमिडीज़ का सिद्धांत – उथल बल विस्थापित द्रव के भार के बराबर होता है।

❓ Top 10 FAQs – Gravitation (Bilingual Format)
No. | English Question | हिंदी प्रश्न | Bilingual Answer |
1 | What is Gravitation? | गुरुत्वाकर्षण क्या है? | गुरुत्वाकर्षण ब्रह्मांड की किसी भी दो वस्तुओं के बीच आकर्षण का बल है। |
2 | State the Universal Law of Gravitation. | सार्वत्रिक गुरुत्वाकर्षण का नियम बताइए। | Every object attracts every other object with a force proportional to the product of their masses and inversely proportional to square of the distance between them. / प्रत्येक वस्तु दूसरी वस्तु को उनके द्रव्यमानों के गुणनफल के समानुपाती और दूरी के वर्ग के व्युत्क्रमानुपाती बल से आकर्षित करती है। |
3 | What is free fall? | मुक्त पतन क्या है? | When an object falls under gravity alone, it’s called free fall. / जब कोई वस्तु केवल गुरुत्व बल के कारण गिरती है, तो उसे मुक्त पतन कहते हैं। |
4 | Define mass and weight. | द्रव्यमान और भार को परिभाषित कीजिए। | द्रव्यमान किसी वस्तु में मौजूद पदार्थ की मात्रा है और भार गुरुत्वजनित बल होता है। |
5 | Value of G? | G का मान क्या है? | 6.67 × 10⁻¹¹ Nm²/kg² |
6 | Does value of ‘g’ change? | क्या g का मान बदलता है? | Yes, it varies with altitude and depth. / हाँ, यह ऊँचाई और गहराई के अनुसार बदलता है। |
7 | Define buoyancy. | उथलता को परिभाषित करें। | उथलता वह बल है जो द्रव द्वारा ऊपर की ओर लगाया जाता है। |
8 | What is Archimedes’ Principle? | आर्किमिडीज़ सिद्धांत क्या है? | यह कहता है कि उथल बल = विस्थापित द्रव का भार। |
9 | Why do objects sink or float? | वस्तुएं तैरती या डूबती क्यों हैं? | Depends on density and buoyant force. / घनत्व और उथल बल पर निर्भर करता है। |
10 | What is relative density? | आपेक्षिक घनत्व क्या है? | Relative density = Density of substance / Density of water. / आपेक्षिक घनत्व = पदार्थ का घनत्व / जल का घनत्व। |
🌟 Why Learn Gravitation with BASTRONAUTWAY?
⭐ Feature | 🔥 Description |
🎯 Concept Clarity | Easy explanations with logic and relatable examples |
🌐 Bilingual Format | English + Hindi for better understanding |
📝 MCQs + FAQs | Useful for revision and board preparation |
🎓 Board-Ready | Perfectly curated for school exams |

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🧪 Quick Revision Flashcards
📊 Mock Test Series for Term Exams
🔗 Follow BASTRONAUTWAY for More: Bilingual science notes, MCQs, diagrams, and solutions curated by Grandmaster Bikram Sutradhar (SirBikramSutradhar) – Your companion to mastering science with clarity and confidence!
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CBSE Class 10 Mathematics (2025) NCERT Syllabus:
CBSE Class 10 Mathematics NCERT Syllabus (2025) – Chapter-Wise List
CBSE Class 10 Mathematics NCERT Syllabus (2025) – Chapter-Wise List
chapter 4. Quadratic Equations
chapter 5. Arithmetic Progressions
chapter 6. Triangles
chapter 7. Coordinate Geometry
chapter 8. Introduction to Trigonometry
chapter 9. Some Applications of Trigonometry
chapter 11. Areas Related to Circles
chapter 12. Surface Areas and Volumes
class 10 science ncert solution
CBSE Class 10 Science (2025) NCERT Syllabus:
CBSE Class 10 Science NCERT Syllabus (2025) – Chapter-Wise List
CBSE Class 10 Science NCERT Syllabus (2025) – Chapter-Wise List
Chapter 1 Chemical Reactions and Equations
Chapter 2 Acids, Bases and Salts
Chapter 3 Metals and Non-metals
Chapter 4 Carbon and its Compounds
Chapter 5 Life Processes
Chapter 6 Control and Coordination
Chapter 7 How do Organisms Reproduce?
Chapter 8 Heredity
Chapter 9 Light – Reflection and Refraction
Chapter 10 The Human Eye and the Colourful World
Chapter 11 Electricity
Chapter 12 Magnetic Effects of Electric Current
Chapter 13 Our Environment
📖 Chapter 12 – Organic Chemistry (Selina Textbook)
Table of Contents:
- 12A. Organic Compounds
- 12B. Hydrocarbons: Alkanes
- 12C. Hydrocarbons: Alkenes
- 12D. Hydrocarbons: Alkynes
- 12E. Alcohols
- 12F. Carboxylic Acids
- Exercise 12 MISCELLANEOUS
- Glossary
- Model Question Paper –
📌 Exercise 12 MISCELLANEOUS – Focus Areas:
🧬 Consolidated practice from the entire Organic Chemistry chapter
🧪 Application-based questions covering alkanes, alkenes, alkynes, alcohols, and carboxylic acids
🧾 Writing structural formulas and chemical equations
💡 Distinguishing reactions, isomer identification, and conversions
📘 Full-syllabus revision to boost conceptual clarity and board exam readiness
Each question in this section is designed to:
✅ Strengthen cross-topic understanding
📝 Prepare students for application-based and reasoning-based questions
🧠 Improve problem-solving speed and exam performance
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