Physics

Gravitation and Orbital Mechanics

500 Questions

Gravitation and orbital mechanics focus on planetary motion, elliptical orbits, and satellite deployment. Questions examine astrodynamics fundamentals, including geostationary orbits and perturbation theory. These topics are highly relevant for civil services and specialized technical examinations.

Planetary orbitsSatellite dynamicsGeostationary orbitsPerturbation theoryOrbital eccentricity

Gravitation and Orbital Mechanics Questions

Multiple choice

What is the path of a revolving object called?

  1. Axis

  2. Orbit

  3. Rotation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An orbit is the curved path that an object in space takes around another object due to gravity. An axis is a line of rotation, while rotation is the act of spinning.

Multiple choice

The spinning of an object around a center point

  1. Rotation

  2. Axis

  3. Solar System

  4. Revolution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rotation is the action of spinning around an internal axis. This is different from revolution, which is the movement around an external point.

Multiple choice physics gravitational fields representing a gravitational field gravitational field circular motion and gravitation

What is the time period satellite near the earth surface (neglect the height of orbit of satellite from the surface of ground)?

  1. $30.53 \ minutes$
  2. $50.38 \ minutes$
  3. $52.68 \ minutes$
  4. $84.75 \ minutes$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$T =$ Time period

$R=$ radius of earth $= 6400000m$
Gravitational constant $= G=$ $ 6.67\times {10}^{-11} Nm^2/kg^2$
$M=$ mass of earth $=$ $6\times{10}^{24}kg$

$T=$ $2\pi\sqrt{\dfrac {R^3}{GM}}$
Substitute and calculate
Whatever answer you get, divide it by $60$ so that it gets converted into minutes.

Multiple choice

What is the approximate orbital period of Halley's Comet?

  1. 76 years

  2. 100 years

  3. 150 years

  4. 200 years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Halley's Comet has an orbital period of approximately 76 years, meaning it takes about 76 years to complete one orbit around the Sun.

Multiple choice

Which of Kepler's laws states that the planets move in elliptical orbits with the Sun at one focus?

  1. First Law

  2. Second Law

  3. Third Law

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kepler's First Law, also known as the Law of Ellipses, states that the planets move in elliptical orbits with the Sun at one focus.

Multiple choice

According to Kepler's Second Law, a line connecting a planet to the Sun sweeps out equal areas in equal times.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kepler's Second Law, also known as the Law of Equal Areas, states that a line connecting a planet to the Sun sweeps out equal areas in equal times.

Multiple choice

The square of the orbital period of a planet is proportional to the cube of its average distance from the Sun.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kepler's Third Law, also known as the Law of Periods, states that the square of the orbital period of a planet is proportional to the cube of its average distance from the Sun.

Multiple choice

Which of the following is not a consequence of Kepler's Laws?

  1. Planets move in circular orbits.

  2. The Sun is at the center of the solar system.

  3. The planets' orbits are elliptical.

  4. The planets' orbital periods are proportional to their distances from the Sun.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kepler's Laws state that the planets move in elliptical orbits, not circular orbits.

Multiple choice

The eccentricity of an elliptical orbit is a measure of how much the orbit deviates from a circle.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The eccentricity of an elliptical orbit is a measure of how much the orbit deviates from a circle, with a value between 0 and 1.

Multiple choice

The semi-major axis of an elliptical orbit is the average distance of the planet from the Sun.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The semi-major axis of an elliptical orbit is the average distance of the planet from the Sun.

Multiple choice

Kepler's Laws apply to all objects orbiting the Sun, including planets, moons, asteroids, and comets.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kepler's Laws apply to all objects orbiting the Sun, regardless of their size or composition.

Multiple choice

The perihelion of an elliptical orbit is the point where the planet is closest to the Sun.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The perihelion of an elliptical orbit is the point where the planet is closest to the Sun.

Multiple choice

The aphelion of an elliptical orbit is the point where the planet is farthest from the Sun.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The aphelion of an elliptical orbit is the point where the planet is farthest from the Sun.

Multiple choice

What is the Roche Limit?

  1. The distance beyond which a celestial body will disintegrate due to tidal forces.

  2. The distance beyond which a celestial body will be captured by another celestial body.

  3. The distance beyond which a celestial body will escape from the gravitational pull of another celestial body.

  4. The distance beyond which a celestial body will experience no tidal forces.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Roche Limit is the distance from a larger celestial body beyond which a smaller celestial body will disintegrate due to tidal forces. This is because the gravitational forces of the larger body are stronger than the gravitational forces holding the smaller body together.