This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Gravitation > Class 9 Science Chapter 10 Gravitation – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 10 Gravitation Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The gravitational force between two massive spheres A) Is always an attraction. B) Depends on how massive they are. C) Depends inversely on the square of the distances betwn them. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. Which of the following best explains why astronauts feel weightless in space? A) There is no gravity in space. B) They are in free fall, experiencing continuous free-fall towards Earth. C) The gravitational pull of Earth is too weak. D) They are too far from any massive object. Show Answer Correct Answer: B) They are in free fall, experiencing continuous free-fall towards Earth. 3. The mass of a body on the surface of earth is 12 kg. If acceleration due to gravity on moon is 1/6 of acceleration due to gravity on earth, then its mass on moon will be A) 72kg. B) Zero. C) 2kgf. D) 12kg. Show Answer Correct Answer: D) 12kg. 4. What is the reason for the motion of the moon on its orbit? A) The gravitational force exerted on the Earth by the moon. B) The gravitational force exerted by the sun. C) The gravitational force exerted on the Moon by the earth. D) The gravitational force exerted by the planets. Show Answer Correct Answer: C) The gravitational force exerted on the Moon by the earth. 5. In the last question, what is the magnitude of the gravitational force of the car on the Earth? A) Less than the force of the Earth on the car. B) Equal to the force of the Earth on the car. C) Greater than the force of the Earth on the car. D) None of the above. Show Answer Correct Answer: B) Equal to the force of the Earth on the car. 6. A stone is dropped from the roof of a building take 4 sec. to reach the ground. Then the height of the buolding is A) 74.4 m. B) 78.4 m. C) 0 m. D) 72.6 m. Show Answer Correct Answer: B) 78.4 m. 7. If M=m=1 kg and d= 1 m, Then the gravitational force between M and m is ..... A) 6.673X10$^{-11}$ N. B) 6.673X10$^{-11}$ Nm$^{2}$kg$^{-2}$. C) 1 N. D) None of the above. Show Answer Correct Answer: A) 6.673X10$^{-11}$ N. 8. The acceleration due to gravity acting on a freely falling body is directly proportional to the mass of thebody. True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 9. What happen to the gravitational acceleration to an object if the object is moving from surface of the planets to the outer space? A) Increases. B) Unchanged. C) Decreases. D) Increase, then decrease. Show Answer Correct Answer: C) Decreases. 10. What happens to Gravitational force if I double both of the masses but don't change their distance? A) Doubles. B) Half as big. C) 4x bigger. D) 4x smaller. Show Answer Correct Answer: C) 4x bigger. 11. S.I.unit of gravitational force A) Kg. B) Kg f. C) N. D) $\frac{m}{s^2}$. Show Answer Correct Answer: C) N. 12. Which of the following statements is correct with respect to G and g? A) G is a fundamental constant, whereas g is a physical quantity and subject to change. B) Both G and g can change, but g can only change if you go to a different planet. C) G and g are both constant, but g is determined by the mass and radius of the Earth. D) The strength of G is determined by g. Show Answer Correct Answer: A) G is a fundamental constant, whereas g is a physical quantity and subject to change. 13. Force of gravity is directly proportional to A) Mass. B) Time. C) Distance. D) Weight. Show Answer Correct Answer: A) Mass. 14. The weight of an object on the earth is about one-sixth of its weight on the moon. True or False? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 15. Kepler's first law states that the orbits of the planets are oval in shape or A) Ellipses. B) Perfect circles. C) All the above. D) None of the above. Show Answer Correct Answer: A) Ellipses. 16. 6) The pressure exerted by man on earth is minimum when he A) Sits. B) Stands on both foot. C) Stands on one feet. D) Lies on ground. Show Answer Correct Answer: D) Lies on ground. 17. What is the force that causes an apple to fall from a tree to the ground? A) Electromagnetic force. B) Nuclear force. C) Frictional force. D) Gravitational force. Show Answer Correct Answer: D) Gravitational force. 18. When lift is moving down in such a way that its velocity is decreasing then the weight of the person standing inside will A) Increase. B) Decrease. C) Remains same. D) First increase and then decrease. Show Answer Correct Answer: A) Increase. 19. The earth do not fall towards an apple because ..... A) For a given force, the acceleration is inversely proportional to the mass of the object. B) For a given force, the acceleration is directly proportional to the mass of the object. C) All the above. D) None of the above. Show Answer Correct Answer: A) For a given force, the acceleration is inversely proportional to the mass of the object. 20. The mass of a body on moon is 40 kg, what is the weight on the earth? A) 400kg. B) Disobedient. C) 240N. D) 240kg. Show Answer Correct Answer: B) Disobedient. 21. At what place on the earth's surface is the weight of a body minimum:Where is the weight of the object minimized on the surface of the Earth: A) At Center/Center. B) Remains Always Constant / Always remains the same. C) At Poles/Dhruv. D) At equator/equator. Show Answer Correct Answer: D) At equator/equator. 22. An apple falls from a tree because of gravitational attractionbetween the Earth and the apple. If F$_{1}$ is the magnitude of force exerted by the Earth on the apple and F$_{2}$ is the magnitude of force exerted by the apple on the Earth, then A) F$_{1}$ is very much greater than F$_{2}$. B) F$_{2}$ is very much greater than F$_{1}$. C) F$_{1}$ is only a little greater than F$_{2}$. D) F$_{1}$ and F$_{1}$ are equal. Show Answer Correct Answer: D) F$_{1}$ and F$_{1}$ are equal. 23. A stone dropped from the roof of a building takes 4s to reach the ground. The height of the building is: A) 156.8m. B) 19.p. C) 39, mother. D) 78.chm. Show Answer Correct Answer: D) 78.chm. 24. How does force of gravitation act when masses of two objects are doubled A) 1/4x force. B) 1/9x force. C) 4x force. D) 2x force. Show Answer Correct Answer: C) 4x force. 25. Which of the following has no unit? A) Density. B) Thrust. C) Relative density. D) Pressure. Show Answer Correct Answer: C) Relative density. 26. What is inverse square law? A) 1/r square. B) D square. C) 4/r square. D) R square. Show Answer Correct Answer: A) 1/r square. 27. The weight of any person on the moon is about 1/6 times that on the earth. He can lift a mass of 12 kg on the earth. What will be the maximum mass, which can be lifted by the same force applied by the person on the moon? A) 96kg. B) 72KG. C) 54kg. D) 60KG. Show Answer Correct Answer: B) 72KG. 28. What is 'g' of earth A) 10. B) 6.67. C) 6.67*10-11(that is power-11). D) 9.8. Show Answer Correct Answer: D) 9.8. 29. What is the force of attraction between two objects with masses $m_1$ $m_2$ $r$ A) $F = G \frac{m_1-m_2}{r^2}$. B) $F = G \frac{m_1 m_2}{r}$. C) $F = G \frac{m_1 m_2}{r^2}$. D) $F = G \frac{m_1 + m_2}{r^2}$. Show Answer Correct Answer: C) $F = G \frac{m_1 m_2}{r^2}$. 30. 5) Choose the correct unit for the relative density among the following: A) Unitless. B) Pascal. C) Newton. D) M/s. Show Answer Correct Answer: A) Unitless. 31. Which of the following statements is/are correct? 1. Mass of an object is the measure of its inertia. 2. Heavier the object smaller is the inertia. 3. The mass of an object is variable. (a) Only 1 (b) 1 and 3 (c) 2 and 3 (d) 1 and 2 A) A. B) C. C) B. D) D. Show Answer Correct Answer: A) A. 32. The weight of a person on the moon is about 1/6 times that on the earth.He can lift a mass of 15kg on the earth. What will be the maximum mass which can be lifted by the same force applied by the person on the moon? A) 19g. B) 9kg. C) 90 kg. D) 90g. Show Answer Correct Answer: C) 90 kg. 33. The masses of two planets are in the ratio 1:2. Their radii are in the ratio 1:2. The acceleration due to gravity on the planets are in the ratio A) 4:1. B) 1:2. C) 1:4. D) 2:1. Show Answer Correct Answer: D) 2:1. 34. The gravitational force between two objects does not depend on: A) (a)Distance between the masses. B) Product of the masses. C) Sum of the masses. D) Gravitational constant. Show Answer Correct Answer: C) Sum of the masses. 35. Force of gravity is inversely proportional to A) Time. B) Weight. C) Mass. D) Distance. Show Answer Correct Answer: D) Distance. 36. 10) What is buoyant force? A) An upward force on an object immersed in a liquid. B) Partially downward force. C) A down ward force on an object immersed in a liquid. D) None of the above. Show Answer Correct Answer: A) An upward force on an object immersed in a liquid. 37. The square of period of revolution around the Sun is ..... to the cube of mean distance of a planet from the Sun A) Directly proportional. B) Indirectly proportional. C) All the above. D) None of the above. Show Answer Correct Answer: A) Directly proportional. 38. Every object in the universe attracts everyother object with a force which is proportionalto the product of their ..... and inverselyproportional to the ..... A) Square of the distance between them, masses. B) Masses, distance between them. C) Distance between them, masses. D) Masses, square of the distance between them. Show Answer Correct Answer: D) Masses, square of the distance between them. 39. Constant of proportionality is A) G. B) G. C) All the above. D) None of the above. Show Answer Correct Answer: A) G. 40. A falling stone also attracts the earth. True of False A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 41. The motion of the moon around the the earth is due to which force? A) Gravitational force. B) Frictional force. C) Centripetal force. D) Option 1 and 3. Show Answer Correct Answer: D) Option 1 and 3. 42. On doing down deep into the earth the acceleration due to gravity A) Increase. B) Decrease. C) Remain Same. D) First Increase and then decrease. Show Answer Correct Answer: B) Decrease. 43. A ball is thrown vertically upward returns to the thrower after 6 sec. Then the velocity with which it was thrown A) 28.4 m/sec. B) 25 m/sec. C) 29.4 m/sec. D) 27.4 m/sec. Show Answer Correct Answer: C) 29.4 m/sec. 44. G stands for:g means A) Gravitational constant/gravity constant. B) Acceleration due to gravity/ gravitational acceleration. C) Velocity /velocity. D) Force/force. Show Answer Correct Answer: A) Gravitational constant/gravity constant. 45. The universal law of gravitation was posted by:Universal rules of gravity were given: A) Thomson/Thomson. B) Galileo /Galileo. C) Copernicus/Copernicus. D) Newton /Newton. Show Answer Correct Answer: D) Newton /Newton. 46. 10 kg wt equals:10 kg weight is equal: A) 9.8 N. B) 0.98 N. C) 98 N. D) 980 N. Show Answer Correct Answer: C) 98 N. 47. If the ball is drop at the height of 200 m above the earth surface.What will be velocity just touch the ground A) 270 m/sec. B) 140 m/sec. C) 70 m/sec. D) None of these. Show Answer Correct Answer: B) 140 m/sec. 48. 8) School bags have a broader base to reduce A) Weight. B) Air resistance. C) Normal reaction. D) Pressure. Show Answer Correct Answer: D) Pressure. 49. Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, will those packets take same time to reach the surface of earth. A) At poles reaches early. B) At equator reaches early. C) Reaches at equal rate at poles and equator. D) Never reach earth. Show Answer Correct Answer: A) At poles reaches early. 50. A ball is thrown vertically upward with 40 m/s speed. What is its speed when it reaches the maximum height? A) 5 m/s. B) 2.5 m/s. C) Zero. D) 9.8 m/s. Show Answer Correct Answer: C) Zero. 51. Which of the following factors does the acceleration due to gravity on the Earth depend upon? A) Mass of the Body. B) Mass of the Earth. C) The volume of the Body. D) Shape and Size of the Body. Show Answer Correct Answer: B) Mass of the Earth. 52. What is the gravitational force between two objects dependent on? A) The mass of the objects and the distance between them. B) Only the mass of the objects. C) Only the distance between the objects. D) The volume of the objects. Show Answer Correct Answer: A) The mass of the objects and the distance between them. 53. If 240 kg is the weight of body on earth then its weight on the surface of moon is A) 60 kg. B) 20 kg. C) 120 kg. D) 40 kg. Show Answer Correct Answer: D) 40 kg. 54. When a body is thrown vertically upwards, what is its final velocity:When an object is upwards upwards, what will be the last velocity of that object A) Depends on Situation/situation will depend on. B) Minimum/minimum. C) Maximum/maximum. D) Zero/ zero. Show Answer Correct Answer: D) Zero/ zero. 55. Mass of an object on earth is 10 kg. what its value on moon? A) 100 N. B) Can't say anything. C) 100 kg. D) 10 kg. Show Answer Correct Answer: D) 10 kg. 56. The gravitational force between two objects is F. If masses of both objects are doubled and distance between them becomes doubled, then the gravitational force would become A) F. B) 4F. C) Fly. D) 6F. Show Answer Correct Answer: A) F. 57. In the relation F = GM m/d$^{2}$, the quantity G A) Is greatest at the surface of the Earth. B) Is universal constant of nature. C) Depends on the value of G at the place of observation. D) Is used only when the Earth is one of the two masses. Show Answer Correct Answer: B) Is universal constant of nature. 58. Two objects are attracted to each other with 36 N of gravitational force.What would the force between them be if the distance between them were doubled? A) 9. B) 18. C) 72. D) 144. Show Answer Correct Answer: A) 9. 59. For upward motion, acceleration is A) Zero. B) Negative or positive. C) -g. D) +g. Show Answer Correct Answer: C) -g. 60. When a car is taking a turn towards left the person sitting inside will experience a centrifugal force in ..... direction. A) Downwards. B) Upwards. C) Rightwards. D) Leftwards. Show Answer Correct Answer: C) Rightwards. ← PreviousNext →Related QuizzesScience QuizzesClass 9 QuizzesClass 9 Science Chapter 10 Gravitation Quiz 1Class 9 Science Chapter 10 Gravitation Quiz 2Class 9 Science Chapter 10 Gravitation Quiz 4 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books