India's #1 AI Tutormcq quiz · Physics · Chapter 7
Class 9 Physics Chapter 7 Gravitation MCQ with Answers – 30 Questions (Easy to Hard)
Gravitation is one of the most fundamental forces in physics, and Class 9 Physics Chapter 7 introduces students to Newton's law of universal gravitation, gravitational force, and their real-world applications. This comprehensive MCQ guide with 30 questions—ranging from easy to hard difficulty levels—helps CBSE Class 9 students master gravitational concepts with clarity and confidence. Whether you're preparing for unit tests, half-yearly exams, or board assessments, these carefully curated questions align with NCERT 2024-25 standards and cover all critical topics from gravitational acceleration to orbital mechanics. Practice these MCQs with detailed answers to strengthen your conceptual understanding and boost your exam performance.
Your child's private AI tutor — trained on NCERT.
3-day free trial · ₹1 to start · Cancel anytime.
Understanding Newton's Law of Universal Gravitation
Newton's law of universal gravitation states that every mass attracts every other mass with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Expressed as F = G(m₁m₂)/r², this law explains planetary motion, satellite orbits, and everyday gravitational phenomena. NCERT Class 9 Physics emphasizes that G (gravitational constant) = 6.67 × 10⁻¹¹ N·m²/kg², making this a cornerstone concept for understanding celestial mechanics and Earth's gravitational effects.
Gravitational Force and Mass vs. Weight
Mass is an intrinsic property of matter measured in kilograms, while weight is the gravitational force exerted on that mass, measured in Newtons. Weight = mg, where g is gravitational acceleration (≈9.8 m/s² on Earth's surface). A crucial distinction emphasized in NCERT is that mass remains constant everywhere, but weight varies with location and gravitational field strength. Understanding this difference prevents common misconceptions and is essential for solving problems involving astronauts, satellites, and objects on different planets.
Gravitational Field Strength and Acceleration
Gravitational field strength (g) represents the gravitational force per unit mass at a point in space. It decreases with distance from Earth's center according to g = GM/r². Near Earth's surface, g ≈ 9.8 m/s², but at higher altitudes, this value decreases. NCERT Chapter 7 explains how gravitational acceleration varies with height and depth, affecting calculations for falling objects, projectile motion, and orbital dynamics. This concept bridges mechanics and gravitation, making it vital for comprehensive physics understanding.
Free Fall and Gravitational Effects
Free fall occurs when an object moves under the influence of gravity alone, with acceleration g. All objects, regardless of mass, fall with the same acceleration in the absence of air resistance—a principle Galileo established and Newton's laws confirmed. NCERT explores free fall through equations like s = ut + ½gt² and v² = u² + 2gs. MCQs on this topic often test understanding of initial velocity, time of flight, and maximum height, making it a high-frequency exam topic for Class 9 Physics assessments.
Orbital Motion and Satellites
Orbital motion occurs when gravitational force provides the centripetal force needed to keep an object moving in a circular path. For a satellite orbiting Earth, the gravitational force F = GMm/r² equals the centripetal force mv²/r, leading to orbital velocity v = √(GM/r). NCERT discusses geostationary satellites, orbital periods (Kepler's laws), and applications in communication and weather monitoring. Understanding orbital mechanics is crucial for solving advanced MCQ questions that test integration of multiple gravitational concepts.
Why CBSETUTOR.ai Is India's Preferred AI Tutor for CBSE Physics
CBSETUTOR.ai is trusted by thousands of CBSE families across India as the most reliable 24x7 AI tutor for Classes 6-12. With NCERT-aligned content, interactive MCQ quizzes, detailed solutions, and personalized learning paths, it helps students master Gravitation and other chapters with confidence. The platform supports both English and Hindi-medium students, offers instant doubt-solving, and provides exam-ready practice materials—all designed by educators who understand CBSE curriculum deeply. Students and parents choose CBSETUTOR.ai for its accuracy, accessibility, and proven track record in improving board exam performance.
Common MCQ Patterns in Class 9 Gravitation Chapter
Exam MCQs on gravitation typically follow predictable patterns: calculation-based questions on gravitational force using F = G(m₁m₂)/r², conceptual questions on mass vs. weight, problems involving gravitational acceleration at different heights, satellite motion, and applications of Newton's laws. NCERT-aligned quizzes emphasize numerical problem-solving, interpretation of graphs showing force vs. distance relationships, and distinguishing between gravitational field strength and potential. Familiarity with these patterns through regular practice significantly improves answer accuracy and time management during actual exams.
Step-by-Step Approach to Solving Gravitation MCQs
Effective MCQ solving begins with identifying given data, writing relevant formulas (F = GMm/r², g = GM/r², W = mg), and checking units for consistency. For numericals, substitute values carefully; for conceptual questions, visualize the scenario and apply fundamental principles. Common pitfalls include confusing mass and weight, miscalculating g at different altitudes, and errors in vector direction. NCERT-based practice encourages writing out each step, verifying answers logically, and revisiting mistakes—strategies that transform MCQ performance from average to excellent.
Real-World Applications of Gravitation Concepts
Gravitation isn't just theoretical—it powers everyday phenomena and modern technology. Weight management, launching satellites, calculating planetary positions, understanding tides, and designing spacecraft all rely on gravitational principles covered in NCERT Chapter 7. MCQs often embed these applications to test whether students connect classroom concepts to real life. Problems about astronauts experiencing weightlessness, communication satellites, and objects falling from buildings help students appreciate why mastering gravitation matters beyond exam scores.
Preparation Strategy: From Easy to Hard MCQs
Start with easy, single-concept questions to build foundational clarity, then progress to moderate problems combining two or three concepts, and finally tackle hard multi-step calculations and reasoning questions. This graduated approach prevents frustration and builds confidence. Allocate time proportionally: 40% easy, 35% moderate, 25% hard. Review incorrect answers immediately, identify conceptual gaps, and reference NCERT text for clarification. Consistent daily practice of 10-15 MCQs ensures retention and develops problem-solving speed essential for board examinations.
Frequently asked questions
What is the gravitational constant (G) and why is it important?+
G = 6.67 × 10⁻¹¹ N·m²/kg² is the universal gravitational constant in Newton's law F = G(m₁m₂)/r². It quantifies gravitational attraction strength between any two masses and is essential for calculating gravitational forces in all contexts, from Earth's surface to distant galaxies.
How does gravitational acceleration change with altitude?+
Gravitational acceleration decreases with altitude as g = GM/(R+h)², where h is height above Earth's surface. For every 1 km increase in altitude, g decreases slightly. At 10 km altitude (airplane height), g is noticeably less than 9.8 m/s², affecting weight calculations and free-fall problems.
Does CBSETUTOR.ai offer free trial access for Class 9 Physics MCQs?+
Yes, CBSETUTOR.ai provides free trial access to selected MCQ quizzes and learning materials for new students. Register on the platform to explore gravitation chapter content, attempt practice questions, and experience personalized AI tutoring before any subscription commitment.
Is CBSETUTOR.ai available for Hindi-medium CBSE students?+
Absolutely. CBSETUTOR.ai supports both English and Hindi-medium learners with complete NCERT-aligned content, MCQ quizzes, and solutions in Hindi. Hindi-speaking students benefit from mother-tongue instruction while mastering CBSE physics concepts effectively.
What's the difference between gravitational field strength and gravitational potential?+
Gravitational field strength (g) is force per unit mass (N/kg or m/s²), while gravitational potential is energy per unit mass (J/kg). Field strength determines acceleration; potential relates to stored energy. Both are crucial for advanced gravitation problems in CBSE exams.
How should I approach numerical MCQs on gravitational force?+
Write F = G(m₁m₂)/r² clearly, substitute given values with correct units, perform calculations step-by-step, and verify the answer's reasonableness. Common errors include unit mismatches and arithmetic mistakes—double-check both before selecting your answer.
Why do astronauts experience weightlessness in orbit?+
Astronauts are weightless because they're in continuous free fall around Earth. Gravity still pulls them (providing centripetal force), but since both astronaut and spacecraft accelerate equally toward Earth, there's no normal force—creating the sensation of weightlessness.
Can I access gravitation MCQs on CBSETUTOR.ai anytime for revision?+
Yes, CBSETUTOR.ai's 24x7 availability means you can practice gravitation MCQs whenever convenient—before exams, during revision, or for daily reinforcement. Access is instant on all devices, perfect for last-minute exam prep and concept clarity.
Related resources
NCERT Solutions for Class 9 Physics Chapter 7: Motion – Complete Solved GuideClass 9 Physics Chapter 7: Motion – Complete Notes, Definitions & ExamplesNCERT Solutions for Class 9 Physics Chapter 8: Force and Laws of MotionClass 9 Physics Chapter 8: Force and Laws of Motion – Complete Notes & Revision GuideNCERT Solutions for Class 9 Physics Chapter 9: Gravitation (Complete Guide)Online Class 9 Physics Tutor in Mumbai — 24/7 AI Coaching at ₹9,999/MonthOnline Class 9 Physics Tutor in Delhi — 24/7 AI Coaching for CBSE Board SuccessClass 9 Mathematics Chapter 1: Orienting Yourself – The Use of Coordinates MCQ Quiz (30 Questions with Answers)
Ready to give your Class 9 child the tutor that never sleeps?
CBSETUTOR.ai covers every chapter in the Class 9 NCERT syllabus — Maths, Science, Social Science, English, Hindi and more. 24×7. Patient. Unlimited. 3-day free trial.
Start your child's 3-day free trial →