9th Class Science Gravitation and Floatation Question Bank

done Gravitation HOTS Objective Problems Total Questions - 10

• question_answer1)
                                                  The gravitational force between two bodies is decreased by 36% when the distance between them is increased by 3m. The initial distance between them is
  A)
   6 m                        done clear
  B)
   9 m   done clear
  C)
   12 m     done clear
  D)
   15 m done clear
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• question_answer2)
  If the distance between two bodies is increased by 25%, then the % change in the gravitational force is
  A)
   Decreases by 36%           done clear
  B)
   Increases by 36% done clear
  C)
   Increases by 64%            done clear
  D)
   Decreases by 64% done clear
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• question_answer3)
  Acceleration due to gravity on the surface of a planet is g/5 where g is the value on the earth. When a body is vertically thrown up on the earth, it reaches a maximum height h. If the same body is projected with the same velocity from the surface of planet, maximum height reached by it would be
  A)
   \[h/5\]                                 done clear
  B)
   \[\text{h}/\text{25}\]       done clear
  C)
   \[5h\]                                   done clear
  D)
   \[25h\] done clear
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• question_answer4)
  An object falls through a distance h in certain time on the earth. The same object falls through a distance 4h in the same time on a planet. If 'g' is acceleration due to gravity on the earth, acceleration due to gravity on that planet is
  A)
   g/4        done clear
  B)
   4 g    done clear
  C)
   g/2                        done clear
  D)
   2 g done clear
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• question_answer5)
  A satellite is launched into a circular orbit of radius "R' around the earth, while a second satellite is launched into an orbit of radius 1.02 R. The percentage difference in the time periods of the two satellites is:
  A)
   0.7                                         done clear
  B)
   1.0   done clear
  C)
   1.5                                         done clear
  D)
   3 done clear
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• question_answer6)
  Two satellites of masses 50 kgs and 100 kgs revolve around the earth in circular orbit of radii 9R and 16R respectively, where 'R' is the radius of the earth. The speeds of the two satellites will be in the ratio
  A)
   3/4                        done clear
  B)
   4/3   done clear
  C)
   9/16                      done clear
  D)
   16/9 done clear
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• question_answer7)
  The time period of a satellite of earth is 5 hrs. If the separation between earth and the satellite is increased to 4 times the previous value, the new time period will become
  A)
   10 hours              done clear
  B)
   80 hours done clear
  C)
   40 hours  done clear
  D)
   20 hours done clear
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• question_answer8)
  The time of revolution of planet A around the sun is 8 times that of another planet B. The distance of planet A from the sun is how many times greater than that of the planet B from the sun?
  A)
   2                                             done clear
  B)
   3     done clear
  C)
   4             done clear
  D)
   5 done clear
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• question_answer9)
  The distance of Neptune and Saturn from the Sun are respectively. \[\text{1}{{0}^{\text{13}}}\]and \[\text{1}{{0}^{\text{12}}}\] metres and their periodic times are respectively\[{{T}_{n}}\]and\[{{T}_{s}}\]. If their orbits are assumed to be circular, the value of\[{{T}_{n}}/{{T}_{s}}\]is
  A)
   100                        done clear
  B)
   \[10\sqrt{10}\]     done clear
  C)
   \[\frac{1}{10\sqrt{10}}\]                              done clear
  D)
   10 done clear
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• question_answer10)
  The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be
  A)
   2 T                                         done clear
  B)
   \[2\sqrt{2}T\]    done clear
  C)
   4 T                                         done clear
  D)
   8 T done clear
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