Physics

Gravitation and Orbital Mechanics

522 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 general knowledge

The Earth orbits the Sun at

  1. 104,415 km per hour

  2. 107,320 km per hour

  3. 109,625 km per hour

  4. 115,620km per hour
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earth orbits the Sun at an average speed of about 107,200 km/h (29.78 km/s). This speed varies slightly due to Earth's elliptical orbit.

Multiple choice general knowledge science & technology

Our earth orbits around the sun. How long does one complete orbit of the earth around the sun take?

  1. Less than 365 1/4 days

  2. Exactly 365 1/4 days

  3. More than 365 1/4 days

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

One orbit around the sun (a tropical year) takes approximately 365.2422 days, which is slightly less than 365 1/4 (365.25) days. The difference is why our calendar skips leap years on century years not divisible by 400. The 365 1/4 approximation was used in the Julian calendar but was slightly too long.

Multiple choice general knowledge science & technology

The earth not only orbits around the sun, but also spins round her axis. How long does one complete turn of the earth round her axis take?

  1. Less than 24 hours

  2. Exactly 24 hours

  3. More than 24 hours

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

Earth's actual rotation period (sidereal day) is approximately 23 hours, 56 minutes, and 4 seconds, which is less than 24 hours. The 24-hour solar day is slightly longer because Earth must rotate a bit extra to face the sun again due to its orbital motion. This is why stars rise about 4 minutes earlier each night.

Multiple choice general knowledge science & technology

Can Solar System be assumed as a gigantic clock around the Sun and the motion of the Planets be predicted accurately?

  1. No, as One of the fundamental principles of experimental science is that no real measurement is infinitely precise, but instead must necessarily include a degree of uncertainty in the value.

  2. Yes, As the Newtonian Equations is the most deterministic model of motion of any object

  3. No, as it is impossible to actually measure the initial positions and speeds of the planets to infinite precision, and a very tiny imprecision in the initial conditions would grow in time at an enormous rate.

  4. No. The practical difficulty are the limits of computer power. Even with the help of calculators, desktop computers, Super Computers the long-term calculations were too lengthy. The conclusion from all this is that while new real-life chaos discoveries a

  5. Both A and D

  6. A, C, D
Reveal answer Fill a bubble to check yourself
F Correct answer
Explanation

The solar system cannot be treated as a perfectly predictable clock for multiple reasons: measurement uncertainty (A), chaos theory/sensitivity to initial conditions (C), and computational limitations (D). This is related to chaos theory - small imprecisions grow exponentially over time, making long-term prediction impossible.

Multiple choice general knowledge

The earth is orbiting the sun at?

  1. 35.75 km/s

  2. 26.56 km/s

  3. 29.79 km/s

  4. 31.41 km/s
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earth orbits the Sun at an average velocity of 29.79 km/s. This is Earth's orbital speed around the Sun, which varies slightly due to the elliptical nature of the orbit but averages to approximately 30 km/s.

Multiple choice general knowledge

Miniaturized satellites are satellites of unusually low weights and small sizes. How is it classified for a satellite that weighs less than 10kg.

  1. Minisatellite

  2. Microsatellite

  3. Nanosatellite

  4. Tanosatellite
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Satellite classification by weight: Minisatellite (100-500 kg), Microsatellite (10-100 kg), Nanosatellite (1-10 kg), and Picosatellite (0.1-1 kg). A satellite weighing less than 10 kg is classified as a nanosatellite. 'Tanosatellite' is not a real classification term.

Multiple choice general knowledge science & technology

What is the minimum altitude at which a Geostationary Satellite must be put into orbit????

  1. 30,000 km

  2. 28,000 km

  3. 34,000 km

  4. 36,000 km
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Geostationary satellites must orbit at approximately 35,786 km above Earth's surface. This altitude allows the satellite to orbit at the same rate as Earth's rotation, appearing stationary from the ground. 36,000 km is the closest option to this value.

Multiple choice general knowledge science & technology

What is the minimum altitude at which a Geostationary Satellite must be put into orbit????

  1. 30,000 km

  2. 28,000 km

  3. 34,000 km

  4. 36,000 km
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an exact duplicate of question 53985. Geostationary satellites must orbit at approximately 35,786 km above Earth's surface. This altitude allows the satellite to orbit at the same rate as Earth's rotation, appearing stationary from the ground. 36,000 km is the closest option to this value.

Multiple choice general knowledge

Average orbital speed of Moon is

  1. 1.022 Km/sec

  2. 2.022 Km/sec

  3. 3.022 Km/sec

  4. 4.022 Km/sec
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Moon's average orbital speed around Earth is approximately 1.022 km/s (about 3,683 km/h or 2,288 mph). This is a fundamental orbital mechanics measurement. The other options (2.022, 3.022, 4.022 km/s) are significantly higher than the actual orbital velocity.

Multiple choice general knowledge

who calculated the time taken by the earth to orbit the sun hundreds of years before the astronomer Smart. Time taken by earth to orbit the sun: (5th century) 365.258756484 days.

  1. Aryabhatta

  2. Bhaskaracharya

  3. Sridharacharya

  4. shivacharya
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bhaskaracharya (Bhaskara II, 12th century) calculated the Earth's orbital period around the sun with remarkable precision. His Siddhanta Shiromani mentions this calculation. Aryabhatta (5th century) also made significant astronomical contributions but this specific calculation is attributed to Bhaskaracharya.