Quiz  /  Kepler's Law Class 9 MCQ Questions With Answers

  • 1. 
    What is the name of the backward motion of planets that cannot be explained by the geocentric model?

  • retrograde motion
  • revolutionary motion

  • 2. 
    Mass can best be described as?

  • The amount of atoms in an object
  • The gravitational force exerted on an object
  • The compactness of an object

  • 3. 
    What is the maximum eccentricity an ellipse can be?

  • 0
  • .5
  • 1
  • 42

  • 4. 
    What effect does increasing the distance between an ellipse’s foci have on the shape of an ellipse?

  • Increases eccentricity
  • no effect

  • 5. 
    When do planets move the fastest?

  • Close to the sun
  • Far away from the sun

  • 6. 
    Why does weight change depending on the location?

  • The mass of an object changes
  • The gravitational pull changes
  • The volume of the object changes
  • Temperature changes

  • 7. 
    An orbital period is the time (in Earth time) a planet _______________ .​

  • to complete one orbit around the sun
  • Experiences a season

  • 8. 
    Which statement correctly describes when the earth is closest to the sun

  • It is called perihelion and it occurs on July 3rd
  • It is called aphelion and it occurs on July 3rd
  • It is called perihelion and it occurs on January 3rd

  • 9. 
    A wobble back and forth

  • Rotation
  • Nutation
  • Revolution

  • 10. 
    Who proposed Earth centered model?

  • Copernicus
  • Ptolemy
  • Kepler
  • Tycho Brahe

  • 11. 
    What physical property remains constant?

  • Mass
  • Weight
  • Volume
  • Temperature

  • 12. 
    What causes the sun to appear to rise, move across the sky, and set each day

  • revolution of the moon around the earth
  • rotation of the earth

  • 13. 
    How fast does the earth revolve around the sun?

  • 15 degrees per hour
  • 1 degree per hour
  • 1 degree per day
  • 15 degrees per day

  • 14. 
    A perfect circle has an eccentricity of ______.

  • 0
  • .99
  • 2

  • 15. 
    The velocity in which a body revolves around another body

  • Speed
  • motion
  • orbital velocity
  • Acceleration

  • 16. 
    For a planet revolving around the Sun, the time period of the planet depends on

  • Mass of the Sun
  • Mass of the planet
  • Distance between the planet and the Sun
  • Both A and C

  • 17. 
    What did Kepler discover about planets and their orbital speed?

  • Planets with the greatest mass will orbit the Sun with the fastest orbital speed.
  • Planets furthest from the Sun will orbit with the fastest orbital speed.
  • Planets closest to the Sun will orbit with the fastest orbital speed.
  • Planets with the least mass will orbit the Sun with the fastest orbital speed.

  • 18. 
    What does Kepler's 2nd Law state?

  • during a planet's orbit, the planet will sweep out equal areas in its orbit in equal amounts of time
  • all areas are equal in space
  • triangles have equal areas
  • no two points in a planet's orbit are equal

  • 19. 
    Planets revolve around the sun in elliptical orbits

  • Law of Periods
  • Law of orbits
  • Law of Areas

  • 20. 
    In which position is Earth travelling fastest?

  • 1
  • 5
  • 7
  • 10

  • 21. 
    'G' is called

  • acceleration due to gravity
  • gravity
  • gravitational constant
  • gravitational force

  • 22. 
    Which object would have an eccentricity closest to 0?

  • Red
  • Blue
  • Pink

  • 23. 
    Unit of 'G' is

  • N-m2/kg
  • N-m/kg2
  • N-m2/kg2
  • N-m/kg
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