Celestial Mechanics MCQs with Answers

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Celestial Mechanics Online Quiz

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• Test Name: Celestial Mechanics MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Celestial Mechanics

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1 / 40

What is Kepler's Third Law of planetary motion?

The square of the orbital period is proportional to the cube of the semi-major axis

A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time

Planets orbit in ellipses

2 / 40

What is the term for the wobbling motion of the Earth's axis?

Rotation

Nutation

Precession

3 / 40

What is the term for the apparent path of the Sun across the sky?

Equator

Ecliptic

Meridian

4 / 40

What is the semi-major axis of an orbit?

The distance from the center to the focus of an ellipse

Half of the shortest diameter of an ellipse

Half of the longest diameter of an ellipse

5 / 40

What is the term for the shape of the orbits of planets according to Kepler's First Law?

Ellipse

Parabola

Circle

6 / 40

What is the plane in which Earth's orbit lies?

Celestial plane

Ecliptic plane

Equatorial plane

7 / 40

What is a Hohmann transfer orbit?

An orbit that passes over the poles

An orbit that matches Earth's rotation

An efficient way to transfer between two orbits using two engine impulses

8 / 40

What is the term for the velocity needed to maintain a stable orbit?

Terminal velocity

Orbital velocity

Escape velocity

9 / 40

What is the Lagrange point?

The point of farthest approach in an orbit

A position in space where the gravitational forces of two large bodies and the centrifugal force balance

The point of closest approach in an orbit

10 / 40

What is the celestial sphere?

The outer layer of a star

An imaginary sphere of arbitrarily large radius, concentric with Earth, on which all celestial objects appear to lie

The physical boundary of the universe

11 / 40

What is the term for the gravitational effect of the Moon on Earth's oceans?

Tidal force

Centripetal force

Coriolis force

12 / 40

What is the term for the point in an orbit closest to the Sun?

Perihelion

Perigee

Aphelion

13 / 40

What is the term for the point in an orbit farthest from Earth?

Aphelion

Perigee

Apogee

14 / 40

What is the barycenter?

The center of a planet

The center of the Sun

The center of mass of two or more bodies that are orbiting each other

15 / 40

What is an escape velocity?

The speed at which an object falls to a planet

The speed at which an object orbits a planet

The minimum speed needed for an object to break free from a celestial body's gravitational influence

16 / 40

What is the primary cause of the seasons on Earth?

The distance between Earth and the Sun

The tilt of Earth's rotational axis relative to its orbit around the Sun

The elliptical shape of Earth's orbit

17 / 40

What is the sidereal period?

The time taken for a celestial object to rotate once on its axis

The time taken for a celestial object to complete one orbit relative to the stars

The time between successive conjunctions with the Sun

18 / 40

What is the term for the point in an orbit farthest from the Sun?

Apogee

Aphelion

Perihelion

19 / 40

What does Newton's Law of Universal Gravitation state?

For every action, there is an equal and opposite reaction

Every mass attracts every other mass with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers

Objects in motion stay in motion

20 / 40

What is the term for the point in an orbit closest to Earth?

Apogee

Perigee

Perihelion

21 / 40

What is the Oort Cloud?

A belt of asteroids between Mars and Jupiter

A region of the Solar System beyond Neptune

A spherical shell of icy objects surrounding the Solar System at a great distance

22 / 40

What is the Kuiper Belt?

A region of the Solar System beyond Neptune, populated with small icy bodies

A region of space between Mars and Jupiter

A spherical shell of comets surrounding the Solar System

23 / 40

What is Kepler's Second Law of planetary motion?

Planets orbit in ellipses

A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time

The square of the orbital period is proportional to the cube of the semi-major axis

24 / 40

What is an orbital period?

The time taken for a body to complete one orbit around another body

The time taken for a body to rotate once on its axis

The time taken for light to travel from the Sun to Earth

25 / 40

What is a geosynchronous orbit?

An orbit that is highly elliptical

An orbit that passes over the poles

An orbit where a satellite's orbital period matches Earth's rotation period

26 / 40

What is the term for the change in orientation of the rotational axis of a rotating body?

Precession

Nutation

Rotation

27 / 40

What is a solstice?

The time when day and night are of equal length

The time when the Sun is at its greatest distance from the celestial equator

The time when the Sun crosses the celestial equator

28 / 40

What is the inclination of an orbit?

The distance from the central body

The shape of the orbit

The tilt of an orbit's plane with respect to the plane of the equator

29 / 40

What is the apoapsis?

The point where the orbit crosses the equator

The point in an orbit closest to the central body

The point in an orbit farthest from the central body

30 / 40

What is the periapsis?

The point where the orbit crosses the equator

The point in an orbit farthest from the central body

The point in an orbit closest to the central body

31 / 40

What is the term for the gravitational assist used to change the speed and direction of a spacecraft?

Slingshot maneuver

Gravity assist

Orbital boost

32 / 40

What is a synodic period?

The orbital period of a celestial object

The time between successive conjunctions of a celestial object with the Sun

The time taken for a celestial object to rotate once on its axis

33 / 40

What is a transfer orbit?

A stable orbit around a planet

An orbit used to move a spacecraft from one orbit to another

An orbit that passes over the poles

34 / 40

What is the Roche limit?

The maximum distance a satellite can orbit a planet

The distance at which an object is captured by a planet's gravity

The minimum distance to which a celestial body can approach a larger body without being torn apart by tidal forces

35 / 40

What is the term for the velocity required to stay in orbit around a body?

Terminal velocity

Orbital velocity

Escape velocity

36 / 40

What is an asteroid belt?

A region of space with high density of stars

A region of space where most asteroids are found, primarily between Mars and Jupiter

A ring of debris around a planet

37 / 40

What is the term for the gradual change in the orientation of an orbit?

Nutation

Oscillation

Precession

38 / 40

What is Kepler's First Law of planetary motion?

Planets orbit in ellipses with the Sun at one focus

Planets move faster when closer to the Sun

The square of the orbital period is proportional to the cube of the semi-major axis

39 / 40

What is retrograde motion?

The apparent backward movement of a planet as seen from Earth

The stationary position of a planet in its orbit

The forward movement of a planet in its orbit

40 / 40

What is a polar orbit?

An orbit that is circular

An orbit that matches Earth's rotation

An orbit that passes over the poles

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