This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Physics Part I > Class 11 Physics (Part I) Chapter 6 Gravitation – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why don't satellites get closer to the Earth even though the Earth pulls on them? A) The pull from the sun cancels their movement. B) The pull from the moon cancels their movement. C) They are out of Earth's gravitational field. D) They fall at the same rate that the Earth curves away from them. Show Answer Correct Answer: D) They fall at the same rate that the Earth curves away from them. 2. What is the force exerted by the earth on a 10 kg object on the moon? A) 10 N. B) 16.7 N. C) 98 N. D) Depends on the distance between the earth and the moon. Show Answer Correct Answer: B) 16.7 N. 3. The mass of a body is measured to be 12 kg on the earth. If it is taken to the moon, its mass will be (a) 12 kg (b) 6 kg(c) 2 kg (d) 72 kg A) D. B) C. C) B. D) A. Show Answer Correct Answer: D) A. 4. POOJITHA placed an object in water and observed the upward force exerted by water on it. What is this force called? A) Pressure. B) Thrust. C) Buoyancy. D) Drag. Show Answer Correct Answer: C) Buoyancy. 5. Which statement about gravity is true? A) Gravity causes objects to pull towards one another. B) Gravity causes objects to push away from each other. C) The moon doesn't have any gravity. D) Gravity only takes place between planets. Show Answer Correct Answer: A) Gravity causes objects to pull towards one another. 6. The weight of a 1 kg object on the moon is A) 1.633333kg. B) 1N. C) 1.633333N. D) 1kg. Show Answer Correct Answer: C) 1.633333N. 7. There are two planets, each with the same surface gravity but planet 1 has a greater radius and is less massive than planet 2. Which of these planets has a greater escape velocity? A) Planet 1. B) Planet 2. C) Both have the same escape velocity because surface gravity is equal. D) Not enough information given. Show Answer Correct Answer: B) Planet 2. 8. A spacecraft is placed in a circular orbit around a planet with mass 6.4 x 10$^{23}$ kg. The spacecraft orbits at a height of 4.5 x 10$^{7}$ m above the planet's surface. What additional information is needed to calculate the speed of the spacecraft in the orbit? A) No additional information. B) The planet's radius only. C) The spacecraft's mass only. D) Both the planet's radius and the spacecraft's mass. Show Answer Correct Answer: B) The planet's radius only. 9. What happens to the force of gravity if the mass of one of the objects is doubled? A) The force of gravity doubles. B) The force of gravity is tripled. C) The force of gravity is halved. D) The force of gravity increases 4 times. Show Answer Correct Answer: A) The force of gravity doubles. 10. What is the position of a ball thrown vertically upward after 4 seconds? A) Cannot be determined. B) In the middle of the trajectory. C) At the lowest point. D) At the highest point. Show Answer Correct Answer: A) Cannot be determined. 11. Explain how Newton's law of gravitation applies to objects in orbit. A) Gravity only affects objects on the ground, not those in space. B) Newton's law of gravitation explains that objects in orbit are in free fall towards a larger mass, balanced by their tangential velocity, resulting in a stable orbit. C) Orbits are caused by the repulsion between two objects of equal mass. D) Objects in orbit are stationary and do not experience any forces. Show Answer Correct Answer: B) Newton's law of gravitation explains that objects in orbit are in free fall towards a larger mass, balanced by their tangential velocity, resulting in a stable orbit. 12. If the radius of Earth is 6400 km and mean value of g' on the surface is 9.8 m s$^{-2}$, the value of acceleration due to thegravity at a height 100 km above the surface of Earth is A) 9.5. B) 10. C) 8.7. D) 7.5. Show Answer Correct Answer: A) 9.5. 13. A child whirls a ball in a vertical circle. Assuming the speed of the ball is constant, when would the tension in the cord connected to the ball be the greatest. A) At the top of the circle. B) At the bottom of the circle. C) A little after the bottom of the circle when the ball is climbing. D) A little before the bottom of the circle when the ball is descending quickly. E) Nowhere; the cord is stretched the same amount at all points. Show Answer Correct Answer: B) At the bottom of the circle. 14. The mass of a body is increased 4 fold and mass of other body is increased 16 fold. How should the distance between them be changed to keep the same gravitational force between them? (a) 4 times (b) 4 1 times (c) 8 times (d) 8 1 times A) D. B) C. C) B. D) A. Show Answer Correct Answer: B) C. 15. Which is the formula for Newton's Law of Universal Gravitation? A) F = G * m$_{1}$m$_{2 }$/ r. B) F = G * m$_{1}$m$_{2 }$/ r$^{2}$. C) F = G * m$_{1}$m$_{2 }$/ 2r. D) F = m$_{1}$m$_{2 }$/ 2r. Show Answer Correct Answer: B) F = G * m$_{1}$m$_{2 }$/ r$^{2}$. 16. According to Kepler's second law, what happens to a planet's orbital speed as it moves away from the Sun? A) The speed decreases. B) The speed becomes zero. C) The speed remains constant. D) The speed increases. Show Answer Correct Answer: A) The speed decreases. 17. A coin was tossed vertically upward at a speed of 10.0 m/s from the ground. (a) What is the peak height of the coin? A) 6.12 m. B) 4.08 m. C) 7.14 m. D) 5.10 m. Show Answer Correct Answer: D) 5.10 m. 18. Which of the following relation is true, where r = distance of a planet from the sun and T = Time Period? A) $r^3\propto T^3$. B) $r^2\propto T^2$. C) $r^2\propto T^3$. D) $r^3\propto T^2$. Show Answer Correct Answer: D) $r^3\propto T^2$. 19. V is the orbital velocity of a satellite revolving very close to the surface of earth. The orbital velocity of a geostationary satellite orbiting in a circular orbit at an altitude 6 times radius of earth is. A) $\sqrt{7}v$. B) $\sqrt{6}v$. C) $\frac{v}{\sqrt{6}}$. D) $\frac{v}{\sqrt{7}}$. Show Answer Correct Answer: D) $\frac{v}{\sqrt{7}}$. 20. Mass and weight are different. Mass depends on ..... Weight depends on ..... A) Gravitational force, the amount of matter. B) Placement, force. C) Force, placement. D) The amount of matter, gravitational force. Show Answer Correct Answer: D) The amount of matter, gravitational force. 21. Which of the following does not apply to the moment when Spring tides happen? (HINT:Spring tides happen when there is a straight line with the Earth, sun and moon) A) During new moon. B) During full moon. C) When the moon and the earth are alligned with the sun. D) During quarter moon. Show Answer Correct Answer: D) During quarter moon. 22. State Kepler's First Law of Planetary Motion. A) The orbit of a planet is a spiral path around the Sun. B) The orbit of a planet is a perfect circle with the Sun at the center. C) The orbit of a planet is a straight line from the Sun. D) The orbit of a planet is an ellipse with the Sun at one focus. Show Answer Correct Answer: D) The orbit of a planet is an ellipse with the Sun at one focus. 23. What is the net displacement and total distance covered by a stone thrown vertically upward? A) Net displacement is zero, total distance covered is non-zero. B) Net displacement is zero, total distance covered is zero. C) Net displacement is non-zero, total distance covered is non-zero. D) Net displacement is non-zero, total distance covered is zero. Show Answer Correct Answer: A) Net displacement is zero, total distance covered is non-zero. 24. A stone dropped from a building takes 4 s to reach the ground. The height of the building is A) 156.8 m. B) 80.4 m. C) 19.6 m. D) 78.4 m. Show Answer Correct Answer: D) 78.4 m. 25. If the distance between two objects is tripled, what happens to the gravitational force between them? A) Becomes 9 times smaller. B) Becomes 3 times smaller. C) Becomes 3 times larger. D) Becomes 9 times larger. Show Answer Correct Answer: A) Becomes 9 times smaller. 26. When the distance between two objects is doubled, in terms of $F_g, $ A) $4F_g$. B) $\frac{1}{4}F_g$. C) $\frac{1}{2}F_g$. D) $2F_g$. Show Answer Correct Answer: B) $\frac{1}{4}F_g$. 27. A planet moves ..... when it is farthest from the sun. A) Faster. B) Slower. C) All the above. D) None of the above. Show Answer Correct Answer: B) Slower. 28. Two particles are placed at some distance. If the mass of each of the two particles is tripped, keeping the distance between them unchanged, the value of gravitational force between them will be A) 6 times. B) 1/9 times. C) 9 times. D) 1/6 times. Show Answer Correct Answer: C) 9 times. 29. MASS PROTON IS ..... A) EQUAL TO ELECTRON. B) ATOM. C) NEUTRON. D) NONE OF THESE. Show Answer Correct Answer: C) NEUTRON. 30. A ball is thrown upward with an initial speed of 16 m/s. At what height will its speed reduce to 8 m/s?(Assume g=10 m/s2) A) 12.8 m. B) 7.2 m. C) 9.6 m. D) 4.8 m. Show Answer Correct Answer: C) 9.6 m. 31. Explain Kepler's Third Law in terms of orbital periods and distances. A) The cube of a planet's orbital period is proportional to the square of its distance from the sun. B) The distance of a planet from the sun is proportional to its orbital speed. C) The square of a planet's orbital period is proportional to the cube of its average distance from the sun. D) The average distance from the sun has no effect on a planet's orbital period. Show Answer Correct Answer: C) The square of a planet's orbital period is proportional to the cube of its average distance from the sun. 32. Two objects of different masses falling freely near the surface of moon would(a) have same velocities at any instant(b) have different accelerations(c) experience forces of same magnitude(d) undergo a change in their inertia A) C. B) B. C) A. D) D. Show Answer Correct Answer: C) A. 33. Kepler's first law states that the planets move in circular orbits, with the Sun at the center A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 34. What is the force that causes objects to fall or orbit in curved paths? A) Gravitational force. B) Frictional force. C) Electromagnetic force. D) Tension force. Show Answer Correct Answer: A) Gravitational force. 35. The units for gravitational field strength are ..... A) Kilograms, kg. B) Joules, J. C) Newtons per kilogram, N/kg. D) Degrees celsius, $^{o}$C. Show Answer Correct Answer: C) Newtons per kilogram, N/kg. 36. During a journey from the earth to the moon and back, maximum fuel is spent to overcome the earth's gravity at take off. Reason:Earth's mass is much greater than that of the moon. A) Both assertion and reason are true and reason is the correct explanation of assertion. B) Both assertion and reason are true but reason is not the correct explanation of assertion. C) Assertion is true but reason is false. D) Both Assertion and Reason are false. Show Answer Correct Answer: A) Both assertion and reason are true and reason is the correct explanation of assertion. 37. A satellite orbits Earth at a distance where the gravitational force is $F$ A) $F/2$. B) $F/4$. C) $F/16$. D) $F/8$. Show Answer Correct Answer: B) $F/4$. 38. What is centripetal force ..... A) Force that make the body move in straight with direction of acceleration. B) Force that make the body move in circular path with direction always towards the center of curvature. C) Force that make the body keep moving and keep stationary. D) None of the above. Show Answer Correct Answer: B) Force that make the body move in circular path with direction always towards the center of curvature. 39. The value of g on a planet is one-fourth that on Earth. The weight of a 40 kg object on this planet is: A) 10 N. B) 100 N. C) 400 N. D) 40 N. Show Answer Correct Answer: B) 100 N. 40. The unit for Universal Gravitational Constant is: A) $\frac{Nm^2}{kg^2}$. B) $Nm^2kg^{-1}$. C) $\frac{Nm}{kg^2}$. D) None of the above. Show Answer Correct Answer: A) $\frac{Nm^2}{kg^2}$. 41. What is the formula for calculating the force required to lift an object? A) F = m / g. B) F = m x g. C) F = m + g. D) F = m-g. Show Answer Correct Answer: B) F = m x g. 42. What is the r in the gravitational equation force? A) The reflection between the two objects. B) The resemblance between the two objects. C) The distance between the two objects. D) The density of the two objects combined. Show Answer Correct Answer: C) The distance between the two objects. 43. ..... of a system of particles is defined as the external work required to assemble the particles from infinity to a given configurartion. A) Gravitational force. B) Gravitational potential. C) Gravitational potential energy. D) None of the above. Show Answer Correct Answer: C) Gravitational potential energy. 44. A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet. A) 5s, 19.8m. B) 3s, 18m. C) 4s, 21.6m. D) 6s, 23.5m. Show Answer Correct Answer: C) 4s, 21.6m. 45. The gravitational force between two objects changes with the distance between the two objects A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 46. Scarlett and Aria are conducting a physics experiment. They have two objects of equal mass. They decide to double the masses of both objects. What happens to the force of gravitational attraction between them? A) Doubles. B) Quadruples. C) Cut in Half. D) 4x Smaller. Show Answer Correct Answer: A) Doubles. 47. What is the nature of gravity according to Newton's Law of Universal Gravitation? A) Electromagnetic force. B) Repulsive force. C) Attractive force. D) Nuclear force. Show Answer Correct Answer: C) Attractive force. 48. The value of 'g' A) Increases as we go above the earth's surface. B) Decreases as we go to the centre of the earth. C) Remains constant. D) Is more at equator and less at poles. Show Answer Correct Answer: B) Decreases as we go to the centre of the earth. 49. The period of geostationary artificial satellite of earth is: A) 12 hours. B) 365 days. C) 24 hours. D) 6 hours. Show Answer Correct Answer: C) 24 hours. 50. If the original gravitational force between two objects is 100 N and both masses double and the distance is doubled, what would the new force be? A) 400 N. B) 50 N. C) 200 N. D) 100 N. Show Answer Correct Answer: D) 100 N. 51. ..... is the amount of matter present in the object. A) Weight. B) Mass. C) All the above. D) None of the above. Show Answer Correct Answer: A) Weight. 52. Gravitational potential at a point is ..... A) The work done in bringing a unit mass from the point to infinity. B) The work done in bringing a unit mass from infinity to the point. C) The work done in bringing a unit mass from twice the radius of the mass to the point. D) The work done in bringing a unit charge from infinity to the point. Show Answer Correct Answer: B) The work done in bringing a unit mass from infinity to the point. 53. Gravitational Potential Energy (E$_{p}$) is ..... A) The energy stored in a stretched object. B) The energy stored in an electrically charged object. C) The energy stored in a frozen object. D) The energy stored in a raised object. Show Answer Correct Answer: D) The energy stored in a raised object. 54. The relation between height and depth when the acceleration due to gravity at a height h is equal to that at a depth d is given by A) H=3d. B) H=2d. C) H=3/2 d. D) D=2h. Show Answer Correct Answer: D) D=2h. 55. If the sun's mass is 2.0x10$^{30}$ kg, and itsradius is 7.0 x 10$^{8}$ m, what is the strength of its gravitational field, "g" ? A) 27.2 m/s$^{2}$. B) 200 m/s$^{2}$. C) 272.2 m/s$^{2}$. D) 9.8 m/s$^{2}$. Show Answer Correct Answer: C) 272.2 m/s$^{2}$. 56. Which Scientist drew the conclusion that all masses accelerate at the same rate regardless of their differences in mass? A) Isaac Newton. B) Tycho Brahe. C) Albert Einstein. D) Galileo Galilee. Show Answer Correct Answer: D) Galileo Galilee. 57. Which of the following was NOT a contribution of Newton's to science? A) F = ma. B) The first good experimental measure of G, the gravitational constant of proportionality. C) Explanations of optical phenomena. D) The law of universal gravitation. Show Answer Correct Answer: B) The first good experimental measure of G, the gravitational constant of proportionality. 58. "A force that make an object to follow a circular path with direction always towards the center of curvature." Statement above is the definition of A) Gravitational field strength. B) Gravitational force. C) Escape force. D) Centripetal force. Show Answer Correct Answer: D) Centripetal force. 59. Would a person weigh the same on different moons? A) Weight is determined by the color of the moon. B) Weight is determined by the distance from the Earth. C) No, weight depends on the gravitational field strength of the moon. D) Yes, weight remains constant on all moons. Show Answer Correct Answer: C) No, weight depends on the gravitational field strength of the moon. 60. The square of its period of revolution around the sun is ..... proportional to the cube of the mean distance of a planet from the sun. A) Inversely. B) Directly. C) All the above. D) None of the above. Show Answer Correct Answer: B) Directly. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Physics (Part I) Chapter 6 Gravitation Quiz 1Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 2Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 3Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 4Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 5Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 7Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 8Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books