Keplerian Orbits — MCQs

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1. Who formulated the three laws of planetary motion?





2. According to Kepler’s First Law, the orbit of a planet is a(n):





3. In Kepler’s First Law, the Sun is located at:





4. Kepler’s Second Law is also known as the:





5. Kepler’s Second Law states that a planet moves fastest when it is at:





6. The time taken for a planet to complete one orbit is called its:





7. Kepler’s Third Law relates the square of the orbital period to the cube of the:





8. Kepler’s laws were based on observations made by:





9. In an elliptical orbit, the point closest to the Sun is called:





10. In an elliptical orbit, the farthest point from the Sun is called:





11. The eccentricity of a circular orbit is:





12. If the orbital eccentricity is close to 0, the orbit is nearly:





13. Kepler’s laws apply to:





14. The orbital period of Earth is:





15. The orbital speed of a planet is highest at:





16. The orbital path of a planet is symmetric about:





17. According to Kepler’s Third Law, the ratio





18. Which planet has the most eccentric orbit among major planets?





19. The area swept out by a planet in a given time interval is:





20. A planet takes longer to move from aphelion to perihelion than perihelion to aphelion. True or False?




21. The semi-major axis of Earth’s orbit is approximately:





22. The orbit of a comet is generally:





23. If a body follows a parabolic path, its eccentricity is:





24. For a hyperbolic trajectory, eccentricity is:





25. Which constant of nature was later used by Newton to derive Kepler’s laws?





26. In an elliptical orbit, the semi-major axis is the average of:





27. Orbital eccentricity describes the orbit’s:





28. Which of the following is NOT an orbital element?





29. The line joining perihelion and aphelion is called:





30. The law of areas implies conservation of:





31. Newton showed that Kepler’s laws are a consequence of:





32. The orbital period of Mars is about:





33. Which orbital element defines the tilt of orbit with respect to a reference plane?





34. Which of the following orbits is unbound?





35. Orbital speed decreases as distance from the Sun:





36. Which planet has the least eccentric orbit?





37. The time taken for a satellite to complete one revolution is determined by its:





38. The law of equal areas implies that the planet’s velocity vector:





39. Which of the following describes orbital resonance?





40. Which satellite orbits Earth in about 90 minutes?





41. A geostationary satellite has an orbital period of:





42. The eccentricity of Earth’s orbit is approximately:





43. The semi-major axis of Mars’s orbit is about:





44. Orbital energy is conserved in:





45. Which orbit allows a spacecraft to escape the Sun’s gravity?





46. The orbital speed of Earth around the Sun is approximately:





47. Which is the shortest orbital period planet?





48. Which parameter does NOT affect orbital eccentricity?





49. Kepler’s Third Law is mathematically expressed as:





50. Which of the following best summarizes Kepler’s laws?





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