This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 10 Gravitation – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 10 Gravitation Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The value of G is: A) 9.8m/s$^{-2}$. B) 6.673 * 11$^{-11}$. C) 6.683 * 10 $^{-11}$. D) 6.673 * 10$^{-11}$. Show Answer Correct Answer: D) 6.673 * 10$^{-11}$. 2. 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$^{2}$ times the weight at surface of the Earth. Show Answer Correct Answer: A) Zero. 3. If I double the distance between two objects, what happens to their gravitational Force? A) 4x bigger. B) 4x smaller. C) 2x bigger. D) 2x smaller. Show Answer Correct Answer: B) 4x smaller. 4. 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. 5. 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. 6. 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) 2kgf. B) 72kg. C) 12kg. D) Zero. Show Answer Correct Answer: C) 12kg. 7. 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 by the planets. D) The gravitational force exerted on the Moon by the earth. Show Answer Correct Answer: D) The gravitational force exerted on the Moon by the earth. 8. 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. 9. 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) 72.6 m. C) 78.4 m. D) 0 m. Show Answer Correct Answer: C) 78.4 m. 10. 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. 11. 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. 12. 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) Decreases. C) Unchanged. D) Increase, then decrease. Show Answer Correct Answer: B) Decreases. 13. Which of the following statements about gravitational force is true? A) It acts only on objects with mass. B) It acts only at short distances. C) It is stronger than electromagnetic force. D) It decreases with the square of the distance between two objects. Show Answer Correct Answer: D) It decreases with the square of the distance between two objects. 14. 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. 15. S.I.unit of gravitational force A) N. B) Kg f. C) $\frac{m}{s^2}$. D) Kg. Show Answer Correct Answer: A) N. 16. 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. 17. Force of gravity is directly proportional to A) Mass. B) Weight. C) Distance. D) Time. Show Answer Correct Answer: A) Mass. 18. 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. 19. 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. 20. 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. 21. What is the force that causes an apple to fall from a tree to the ground? A) Electromagnetic force. B) Nuclear force. C) Gravitational force. D) Frictional force. Show Answer Correct Answer: C) Gravitational force. 22. 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. 23. 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. 24. The mass of a body on moon is 40 kg, what is the weight on the earth? A) 400kg. B) 240N. C) 240kg. D) Disobedient. Show Answer Correct Answer: D) Disobedient. 25. 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 Poles/Dhruv. B) At equator/equator. C) At Center/Center. D) Remains Always Constant / Always remains the same. 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