About Kepler's Law

Following are some of the multiple choice questions on the Kepler's Law with answers that will help the students in developing their knowledge.

Kepler's Law MCQ

1. What is inertia?

  • amount of atoms
  • amount of gravitational pull
  • the size
  • resistance to a change in motion

2. A year on Jupiter is 4,344 days long. This tells you how long it takes

  • Jupiter to rotate one time on its axis.
  • Earth to orbit Jupiter.
  • Jupiter to orbit the sun
  • the sun to orbit Jupiter

3. Who was Kepler?

  • Scientist
  • German Astronomer and mathematician

4. The period of geostationary artificial satellite is

  • 6 hours
  • 12 hours
  • 24 hours
  • 48 hours

5. Earth's spinning on its axis is called its _____________.

  • orbit
  • rotation

6. The study of space

  • Astronomy
  • Meteorology
  • Galaxy
  • Geology

7. Kepler’s third law states

  • The semimajor axis is equal to the planet’s average distance from the sun
  • None of these answers is correct
  • The square of the orbital period of a planet is proportional to its orbital radius
  • The orbit of a planet around the sun is an ellipse, with the sun at one focus

8. When the earth is closest to the sun

  • the sun will have the biggest apparent diameter and the greatest gravitational attraction
  • the sun will have the biggest apparent diameter and the smallest gravitational attraction

9. What is obliquity?

  • The measure of the tilt of the Earth
  • The change in the shape of Earth’s orbit around the sun
  • The change in the orientation of Earth’s axis
  • The measure of solar intensity of the sun

10. When a planet orbits the Sun, one of the foci of the elliptical orbit is

  • the axis
  • the perihelion
  • the center
  • the Sun

11. Planets revolve around the sun in elliptical orbits

  • Law of Periods
  • Law of orbits
  • Law of Areas
  • None of these

12. 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

13. What is Kepler's 3rd Law?

  • Law of Areas
  • Law of Periods
  • Law of Orbits
  • None of these

14. What is his nationality

  • Chinese
  • Turkish
  • German
  • Russian

15. Which planet has the least eccentric orbit?

  • Venus
  • Mars
  • Earth
  • Mercury

16. What is Kepler's 2nd Law?

  • Law of Orbits
  • Law of Periods
  • Law of Areas
  • None of these

17. What is Kepler's 1st Law?

  • Law of Areas
  • Law of Periods
  • Law of Orbits
  • All of above

18. Unit of 'G' is

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

19. 'G' is called

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

20. When the distance between two objects increases the gravitational force between them

  • decreases
  • increases
  • no change
  • None of these

21. When the mass of the objects increases the gravitational force between them

  • decreases
  • increases
  • no change
  • Both A & B

22. Who proposed Earth centered model?

  • Copernicus
  • Ptolemy
  • Kepler
  • Tycho Brahe

23. Types of celestial coordinate system

  • Latitude and longitude
  • Ecuatorial and horizontal
  • None
  • All of above

24. What family is he from?

  • His parents was poor
  • He didn't have a family

25. What is the second law of Kepler ?

  • All planets move around the Sun in elliptical orbits, with the Sun as one focus of the ellipse.
  • The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
  • The radius vector of a planet sweeps over in equal areas in equal intervals of time.
  • None of these

26. What is the third law of Kepler

  • The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
  • None

27. What is the line connecting the sun and planet

  • Line
  • Area
  • Imagine
  • Radius vector

28. Firs law of Kepler?

  • None
  • The orbit of planet is an ellipse with the Sun at one of the two foci
  • The radius vector of a planet sweeps over equal areas in equal time intervals of time.
  • The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit

29. The accelerations due to gravity on the surfaces of two planets are equal in magnitudes if

  • massradius\frac{mass}{radius}radiusmass​
  • massradius3\frac{mass}{radius^3}radius3mass​

30. If r represents the radius of the orbit of a satellite of mass m moving round a planet of mass M the velocity of the satellite is given by

  • v2 = GMmrv^2\ =\ \frac{GMm}{r}v2 = rGMm​
  • v2 = gMRv^2\ =\ \frac{gM}{R}v2 = RgM​
  • v=\frac{GMm}{r^2} v= r 2 GMm ​
  • V= ( r GM ​ ) ​

31. What is the reason for the motion of the moon on its orbit?

  • The gravitational force exerted by the sun
  • The gravitational force exerted on the Moon by the earth

32. What is the correct formula to calculate eccentricity?

  • Focal distance / major axis length
  • major axis length / minor axis length
  • minor axis length / major axis length
  • All of above

33. The factors that can determine the force between two objects include all of the following except

  • distance between the 2 objects
  • diameter of the objects

34. Where are the focal points located in a perfect circle?

  • close together
  • on top of each other

35. What will result in the most eccentric elliptical orbit

  • when the focal points are on top of one another
  • then the focal points are farthest apart
  • when the focal points are closest together
  • All of above

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

  • retrograde motion
  • revolutionary motion

37. Which model of the solar system can explain all observations

  • geocentric model
  • heliocentric model

38. What is it called when earth reaches the point in orbit when it is farthest from the sun?

  • Perihelion
  • Aphelion

39. Earth will travel fastest in its orbit when

  • the earth is closest to the sun (January 3rd)
  • The earth is closest to the sun (July 3rd)

40. 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
  • None of these

41. The planet with the most eccentric orbit is

  • Venus
  • Mars
  • Earth
  • Mercury

42. What unit to we usually use to to measure a planet's orbital period?

  • year
  • astronomical unit

43. What causes Earth’s year to be shorter than Jupiter’s year?

  • the shape of Earth’s orbit around the Sun
  • the mass and density of Jupiter
  • the distance between Earth and the Sun
  • What causes Earth’s year to be shorter than Jupiter’s year?

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

  • Increases eccentricity
  • no effect

45. How can the position of the sun in earth's orbit be described?

  • The sun is at one of the two focal points of a slightly eccentric ellipse
  • The sun is at one of the two focal points of a highly eccentric ellipse

46. Where will an object move at the greatest speed as it orbits the sun?

  • Aphelion
  • Between perihelion and aphelion
  • Perihelion
  • None of these

47. 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.

48. Double the distance between two objects

  • 4 times greater gravity attraction
  • 2 times weaker gravity
  • 4 times weaker gravity attraction
  • 2 times greater gravity

49. Double the product of the masses of two objects

  • 4 times weaker gravity force
  • 2 times weaker gravity force
  • 4 times stronger gravity force
  • 2 times stronger gravity force

50. Which of the following can decrease the gravity between objects?

  • Remove mass
  • Decrease distance

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