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Gravitation

63 questions · Physics · NEET
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Gravitation

63 questions · Physics · NEET

  1. The radius of Martian orbit around the Sun is about 4 times the radius of the orbit of Mercury. The Martian year is 687 Earth days. Then which of the following is the length of 1 year on Mercury?2025 · Q168 · MCQ
  2. A body weighs 48 N on the surface of the earth. The gravitational force experienced by the body due to the earth at a height equal to one-third the radius of the earth from its surface is:2025 · Q174 · MCQ
  3. The mass of a planet is 101​th that of the earth and its diameter is half that of the earth. The acceleration due to gravity on that planet is:2024 · Q175 · MCQ
  4. The minimum energy required to launch a satellite of mass m from the surface of earth of mass M and radius R in a circular orbit at an altitude of 2R from the surface of the earth is:2024 · Q194 · MCQ
  5. The escape velocity for earth is v. A planet having 9 times mass that of earth and radius, 16 times that of earth, has the escape velocity of:2024 · Q156 · MCQ
  6. An object of mass 100 kg falls from point A to B as shown in figure. The change in its weight, corrected to the nearest integer is (RE​ is the radius of the earth) Includes diagram2024 · Q189 · MCQ
  7. The escape velocity of a body on the earth surface is 11.2 km/s. If the same body is projected upward with velocity 22.4 km/s, the velocity of this body at infinite distance from the centre…2023 · Q129 · MCQ
  8. If R is the radius of the earth and g is the acceleration due to gravity on the earth surface. Then the mean density of the earth will be :2023 · Q160 · MCQ
  9. Two bodies of mass m and 9m are placed at a distance R. The gravitational potential on the line joining the bodies where the gravitational field equals zero, will be (G= gravitational constant) :2023 · Q157 · MCQ
  10. A satellite is orbiting just above the surface of the earth with period T. If d is the density of the earth and G is the universal constant of gravitation, the quantity Gd3π​ represents :2023 · Q160 · MCQ
  11. A gravitational field is present in a region and a mass is shifted from A to B through different paths as shown. If W1, W2 and W3 represent the work done by the gravitational force along the respective paths, then : Includes diagram2022 · Q168 · MCQ
  12. In a gravitational field, the gravitational potential is given by, V=−xK​ (J/Kg). The gravitational field intensity at point (2, 0, 3) m is2022 · Q171 · MCQ
  13. A body of mass 60 g experiences a gravitational force of 3.0 N, when placed at a particular point. The magnitude of the gravitational field intensity at that point is2022 · Q151 · MCQ
  14. Match List - I with List - II Choose the correct answer from the options given below Includes table2022 · Q159 · MCQ
  15. The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is :2021 · Q148 · MCQ
  16. A particle of mass 'm' is projected with a velocity υ = kVe = (k < 1) from the surface of the earth. (Ve = escape velocity) The maximum height above the surface reached by the particle is :2021 · Q166 · MCQ
  17. A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?2020 · Q121 · MCQ
  18. The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is :2019 · Q118 · MCQ
  19. A body weight 200 N on the surface of earth. How much will it weight half way down to the centre of the earth?2019 · Q123 · MCQ
  20. The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are KA, KB and KC, respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then Includes diagram2018 · Q147 · MCQ
  21. If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?2018 · Q153 · MCQ
  22. The acceleration due to gravity at a height at a height 1 km above the rearth is the same as at a depth d below the surface of earth. Then2017 · Q153 · MCQ
  23. Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will2017 · Q154 · MCQ
  24. At what height from the surface of earth the gravitation potential and the value of g are −5.4 × 107 J kg−1 and 6.0 m s−2 respectively? Take the radius of earth as 6400 km.2016 · Q140 · MCQ
  25. The ratio of escape velocity at earth (ve) to the escape velocity at a planet (vp) whose radius and mean density are twice as that of earth is2016 · Q150 · MCQ
  26. Starting from the centre of the earth having radius R, the variation of g (acceleration due to gravity) is shown by2016 · Q140 · MCQ
  27. A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g0, the value of acceleration due to gravity at the earth's surface, is2016 · Q150 · MCQ
  28. A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 × 106 m above the surface of earth. If earth's radius is 6.38 × 106 m and g = 9.8 ms−2, then the orbital speed of the satellite is2015 · Q140 · MCQ
  29. A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,2015 · Q141 · MCQ
  30. Kepler's third law states that square of period of revoluation (T) of a planet around the sun, is proportional to third power of average distance r between sun and planet i.e. T2 = Kr3 here K is constant. If the masses of sun and planet…2015 · Q145 · MCQ
  31. A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = 5.98 × 1024 kg) have to be compressed to be a black hole?2014 · Q148 · MCQ
  32. Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by2014 · Q149 · MCQ
  33. A particle of mass 'm' is kept at rest at a height 3R from the surface of earth, where 'R' is radius of earth and 'M' is mass of earth. The minimum speed with which it should be projected , so that it does not return back, is (g is…2013 · Q153 · MCQ
  34. The radius of a planet is twice the radius of earth. Both have almost equal average mass densities. VP and VE are escape velocities of the planet and the earth, respectively, then2013 · Q154 · MCQ
  35. A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be2013 · Q150 · MCQ
  36. Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1 m, 2 m, 4 m, 8 m, . . . , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be2013 · Q151 · MCQ
  37. If ve​ is escape velocity and vo​ is orbital velocity of a satellite for orbit close to the earth's surface, then these are related by2012 · Q100 · MCQ
  38. Which one of the following plots represents the variation of gravitiational field on a particle with distance r due to a thin spherical shell of radius R? (r is measured from the centre of the spherical shell)2012 · Q99 · MCQ
  39. A spherical planet has a mass MP and diameter DP. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to2012 · Q152 · MCQ
  40. The height at which the weight of a body becomes (161​)th, its weight on the surface of earth (radius R), is2012 · Q163 · MCQ
  41. A geostationary satellite is orbiting the earth at a height of 5R above the surface of the earth, R being the radius of the earth. The time period of another satellite in hours at a height of 2R from the surface of the earth is2012 · Q164 · MCQ
  42. A particle of mass M is situated at the centre of a spherical shell of same mass and radius a. The magnitude of the gravitational potential at a point sutuated at a/2 distance from the centre, will be :2011 · Q101 · MCQ
  43. A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, M and R. G is gravitational constant and g is acceleration due to gravity on the surface of…2011 · Q102 · MCQ
  44. A planet moving along an elliptical orbit is closest to the sun at a distance r1 and farthest away at a distance of r2. If v1 and v2 are the linear velocities at these points respectively, then the ratio v2​v1​​ is2011 · Q144 · MCQ
  45. The dependence of acceleration due to gravity g on the distance r from the centre of the earth, assumed to be a sphere of radius R of uniform density is as shown in figures below The correct figure is Includes diagram2010 · Q92 · MCQ
  46. (1) Centre of gravity (C.G) of a body is the point at which the weight of the body acts (2) Centre of mass coincides with the centre of gravity if the earth is assumed to have infinitely large radius. (3) To evaluate the gravitational…2010 · Q93 · MCQ
  47. The additional kinetic energy to be provided to a satellite of mass m revolving around a planet of mass M, to transfer it from a circular orbit of radius R1 to another of radius R2(R2 > R1) is2010 · Q94 · MCQ
  48. A man of 50 kg mass is standing in a gravity free space at a height of 10 m above the floor. He throws a stone of 0.5 kg mass downwards with a speed 2 m/s. When the stone reaches the floor, the distance of the man above the floor will be2010 · Q164 · MCQ
  49. A particle of mass M is situated at the centre of a spherical shell of same mass and radius a. The magnitude of the gravitational potential at a point sutuated at a/2 distance from the centre, will be :2010 · Q175 · MCQ
  50. The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If the speed of satellite A is 3V, then the speed of satellite B will be2010 · Q176 · MCQ
  51. The figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded area SAB. If t1 is the time for the planet to move from C to D and t2 is the time to move from A to B then Includes diagram2009 · Q152 · MCQ
  52. Two satellites of earth, S1 and S2 are moving in the same orbit. The mass of S1 is four times the mass of S2. Which one of the following statements is true ?2007 · Q128 · MCQ
  53. The earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The…2006 · Q163 · MCQ
  54. For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is2005 · Q152 · MCQ
  55. Imagine a new planet having the same density as that of earth but it is 3 times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is g and that on the surface of the new planet is g', then2005 · Q164 · MCQ
  56. The density of a newly discovered planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth is R, the radius of the planet would be2004 · Q152 · MCQ
  57. Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be2003 · Q151 · MCQ
  58. The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2 m on the surface of A. What is the height of jump by the same person on the planet B?2003 · Q163 · MCQ
  59. A body of mass m is placed on earth's surface which is taken from earth surface to a height of h = 3R, then change in gravitational potential energy is2003 · Q164 · MCQ
  60. With what velocity should a particle be projected so that its height becomes equal to radius of earth?2001 · Q148 · MCQ
  61. For a planet having mass equal to mass of the earth but radius is one fourth of radius of the earth. Then escape velocity for this planet will be2000 · Q144 · MCQ
  62. Gravitational force is required for2000 · Q156 · MCQ
  63. A body of weight 72 N moves from the surface of earth at a height half of the radius of earth, then gravitational force exerted on it will be2000 · Q157 · MCQ