This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 10 Gravitation – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 10 Gravitation Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is inertia? A) Amount of atoms. B) Amount of gravitational pull. C) The size. D) Resistance to a change in motion. Show Answer Correct Answer: D) Resistance to a change in motion. 2. Weight is A) Gravitational force. B) Quantity of matter. C) Mass of the object. D) Acceleration due to gravity. Show Answer Correct Answer: A) Gravitational force. 3. Two objects of different masses falling freely near the surface of the moon would A) Have same velocities at any instant. B) Have different acceleration. C) Experience forces of same magnitude. D) Undergo a change in their inertia. Show Answer Correct Answer: A) Have same velocities at any instant. 4. The weight of an object on the Moon's surface is A) 1/3 $^{rd}$ of the weight on Earth. B) 1/5 $^{rd}$ of the weight on Earth. C) 1/6$^{th}$ of the weight on Earth. D) 1/2 $^{nd}$ of the weight on Earth. Show Answer Correct Answer: C) 1/6$^{th}$ of the weight on Earth. 5. The value of ' g ' is maximum at A) Equator. B) Below the earth surface. C) Pole. D) None of these. Show Answer Correct Answer: C) Pole. 6. Gravitational force obeys inverse square law. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. If you stood on a ladder so you were twice as far from Earth's center, your weight would be: A) One-eighth its normal value. B) One-quarter its normal value. C) Half its normal value. D) None of the above. Show Answer Correct Answer: B) One-quarter its normal value. 8. Which is a correct statement about mass? A) Mass can be zero. B) Mass is vector quantity. C) Mass is constant everywhere. D) Mass is derived quantity. Show Answer Correct Answer: C) Mass is constant everywhere. 9. Where it will be profitable to purchase one kilogram of apples? A) At poles. B) At Equator. C) At 45$^\circ$Latitudes. D) At 60$^\circ$ Latitudes. Show Answer Correct Answer: B) At Equator. 10. If the mass of Earth increased, with no change in radius, your weight would ..... A) Increase also. B) Stay the same. C) Decrease. D) None of the above. Show Answer Correct Answer: A) Increase also. 11. Which of the following statements is true of the value of acceleration due to gravity? A) The value is the same on the equator and poles. B) The value is least on poles. C) The value is almost negligible on the equator. D) The value increases from pole to equator. Show Answer Correct Answer: C) The value is almost negligible on the equator. 12. If the mass of one object is doubled, how does the gravitational force between two objects change? A) It doubles. B) It halves. C) It remains the same. D) It quadruples. Show Answer Correct Answer: A) It doubles. 13. If the mass of a body is 9.8 kilogram on the earth, what would be its mass on the moon:If the mass of an object is 9.8 kg on the earth, then how much will the mass of that object be on the moon A) 9.8/6 kg. B) 0.98kg. C) 98 kg. D) 9.8 kg. Show Answer Correct Answer: D) 9.8 kg. 14. The atmosphere is held by A) Cloud. B) Gravity. C) Wind. D) Earth Magnetic Field. Show Answer Correct Answer: B) Gravity. 15. Which of the following is Newton's Law on Gravitation? A) F=Gm$_{1}$m$_{2}$/r. B) F = Gm$_{1}$m$_{2}$/r$^{2}$. C) F = Gm$_{1}$m$_{2}$/2r. D) F = m$_{1}$m$_{2}$/2r. Show Answer Correct Answer: B) F = Gm$_{1}$m$_{2}$/r$^{2}$. 16. What is the force of gravity between two objects if the mass of one object is doubled and the distance between them is halved? A) The force is doubled. B) The force is quadrupled. C) The force is halved. D) The force remains the same. Show Answer Correct Answer: B) The force is quadrupled. 17. Weight of an object is directly proportional to mass A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 18. The orbit of a planet is an ellipse with the sun at one of the foci. A) Kepler's First law. B) Kepler's Second law. C) Kepler's third law. D) None of the above. Show Answer Correct Answer: A) Kepler's First law. 19. Suppose Fg between two massive spheres = 90 N. If distance between spheres is tripled, new Fg= A) 270 N. B) 10 N. C) 810 N. D) 30 N. Show Answer Correct Answer: B) 10 N. 20. The force of gravity is ..... to the square of distance A) Inversely proportional. B) Directly proportional. C) All the above. D) None of the above. Show Answer Correct Answer: A) Inversely proportional. 21. The weight of an object at the centre of the earth of radius R, is(a) zero(b) infinite(c) R times the weight at the surface of the earth(d) 1/R times the weight at the surface of the earth A) A. B) B. C) C. D) D. Show Answer Correct Answer: A) A. 22. If the mass of an object is doubled, how does the gravitational force between it and another object change? A) It becomes half. B) It remains the same. C) It doubles. D) It quadruples. Show Answer Correct Answer: C) It doubles. 23. A 1000-kg car rests on the Earth. The magnitude of Fg of the Earth on the car is: A) 6.67 X10-11 N. B) 9.8 N. C) 9800 N. D) 1000 N. Show Answer Correct Answer: C) 9800 N. 24. Weight of Renu on earth is 600 N. What is the weoght on the moon? A) 600 N. B) 60N. C) 60 kg. D) 100 N. Show Answer Correct Answer: D) 100 N. 25. What is the gravitational force between two objects? A) Attraction at large distance only. B) Attraction at small distance only. C) Attraction at all distances. D) Attraction at large distances but repulsive at small distances. 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