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 the plane in which Earth's orbit lies?

Equatorial plane

Ecliptic plane

Celestial plane

2 / 40

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

Perigee

Perihelion

Apogee

3 / 40

What is an orbital period?

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

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

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

4 / 40

What is the primary cause of the seasons on Earth?

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

The distance between Earth and the Sun

The elliptical shape of Earth's orbit

5 / 40

What is a geosynchronous orbit?

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

An orbit that passes over the poles

An orbit that is highly elliptical

6 / 40

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

Perigee

Aphelion

Apogee

7 / 40

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

Centripetal force

Coriolis force

Tidal force

8 / 40

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

Perihelion

Aphelion

Apogee

9 / 40

What is a transfer orbit?

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

An orbit that passes over the poles

A stable orbit around a planet

10 / 40

What is a synodic period?

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

The orbital period of a celestial object

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

11 / 40

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

Meridian

Ecliptic

Equator

12 / 40

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

Parabola

Ellipse

Circle

13 / 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

14 / 40

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

Perigee

Perihelion

Aphelion

15 / 40

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

Nutation

Precession

Rotation

16 / 40

What is a solstice?

The time when the Sun crosses the celestial equator

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

The time when day and night are of equal length

17 / 40

What is the apoapsis?

The point in an orbit closest to the central body

The point in an orbit farthest from the central body

The point where the orbit crosses the equator

18 / 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

19 / 40

What is a Hohmann transfer orbit?

An orbit that matches Earth's rotation

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

An orbit that passes over the poles

20 / 40

What is the periapsis?

The point in an orbit farthest from the central body

The point in an orbit closest to the central body

The point where the orbit crosses the equator

21 / 40

What is an escape velocity?

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

The speed at which an object falls to a planet

The speed at which an object orbits a planet

22 / 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

23 / 40

What is Kepler's Third Law of planetary motion?

Planets orbit in ellipses

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

24 / 40

What is a polar orbit?

An orbit that is circular

An orbit that passes over the poles

An orbit that matches Earth's rotation

25 / 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

26 / 40

What is the Lagrange point?

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

The point of farthest approach in an orbit

The point of closest approach in an orbit

27 / 40

What is the Oort Cloud?

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

A belt of asteroids between Mars and Jupiter

A region of the Solar System beyond Neptune

28 / 40

What is retrograde motion?

The forward movement of a planet in its orbit

The apparent backward movement of a planet as seen from Earth

The stationary position of a planet in its orbit

29 / 40

What is an asteroid belt?

A region of space with high density of stars

A ring of debris around a planet

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

30 / 40

What is the Kuiper Belt?

A region of space between Mars and Jupiter

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

A spherical shell of comets surrounding the Solar System

31 / 40

What is Kepler's Second Law of planetary motion?

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

Planets orbit in ellipses

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

32 / 40

What does Newton's Law of Universal Gravitation state?

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

For every action, there is an equal and opposite reaction

Objects in motion stay in motion

33 / 40

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

Terminal velocity

Orbital velocity

Escape velocity

34 / 40

What is the barycenter?

The center of the Sun

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

The center of a planet

35 / 40

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

Terminal velocity

Orbital velocity

Escape velocity

36 / 40

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

Precession

Rotation

Nutation

37 / 40

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

Orbital boost

Slingshot maneuver

Gravity assist

38 / 40

What is the semi-major axis of an orbit?

Half of the longest diameter of an ellipse

The distance from the center to the focus of an ellipse

Half of the shortest diameter of an ellipse

39 / 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

40 / 40

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

Nutation

Precession

Oscillation

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