Geography ยท Physics

Geodesy and Celestial Mechanics

1,049 Questions

Geodesy and celestial mechanics questions explore Earth measurements, great circles, and planetary motions. These concepts form a crucial part of physical geography and astronomy in competitive exams. Practice these questions to grasp longitudinal and latitudinal calculations.

Longitude and latitude calculationsGreat circle conceptEarths axial precessionLagrangian pointsAtmosphere boundary

Geodesy and Celestial Mechanics Questions

Multiple choice

What is the approximate value of the Earth's obliquity?

  1. 23.5 degrees

  2. 45 degrees

  3. 66.5 degrees

  4. 90 degrees
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth's obliquity is approximately 23.5 degrees.

Multiple choice

How much of the Earth's land surface is covered by permafrost?

  1. 10%

  2. 20%

  3. 30%

  4. 40%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Approximately 20% of the Earth's land surface is covered by permafrost.

Multiple choice

What is the approximate time it takes for the Earth to complete one full rotation on its axis?

  1. 24 hours

  2. 25 hours

  3. 26 hours

  4. 27 hours
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth completes one full rotation on its axis in approximately 24 hours, which is the duration of one solar day.

Multiple choice

What is the period of the precession of the equinoxes?

  1. 25,800 years

  2. 26,000 years

  3. 27,000 years

  4. 28,000 years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The period of the precession of the equinoxes is approximately 25,800 years.

Multiple choice

What is the ratio between the distance on a map and the corresponding distance on the ground called?

  1. Scale

  2. Contour interval

  3. Magnetic declination

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

The scale of a map is the ratio between the distance on the map and the corresponding distance on the ground. It is typically expressed as a fraction or a representative fraction (RF).

Multiple choice

What is the term used to describe the angle between magnetic north and true north?

  1. Declination

  2. Inclination

  3. Azimuth

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

Declination is the angle between magnetic north and true north. It varies depending on the location and can be found using a declination diagram or a compass.

Multiple choice

What is the average distance between the Earth and the asteroid belt?

  1. 2.5 AU

  2. 3.5 AU

  3. 4.5 AU

  4. 5.5 AU
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The average distance between the Earth and the asteroid belt is approximately 2.5 AU (Astronomical Units).

Multiple choice

What is the spatial resolution of NCMRWF's weather forecasts?

  1. 12 km

  2. 25 km

  3. 50 km

  4. 100 km
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

NCMRWF's weather forecasts have a spatial resolution of 12 kilometers.

Multiple choice

What is the term for the point in an orbit where an object is farthest from the body it is orbiting?

  1. Perihelion

  2. Aphelion

  3. Perigee

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

Aphelion is the point in an orbit where an object is farthest from the body it is orbiting, while perihelion is the point where it is closest.

Multiple choice

What is the difference between the length of one Julian year and the length of one tropical year?

  1. 11 minutes 14 seconds

  2. 11 minutes 15 seconds

  3. 11 minutes 16 seconds

  4. 11 minutes 17 seconds
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The difference between the length of one Julian year and the length of one tropical year is 11 minutes 14 seconds.

Multiple choice

What is the length of one Julian year in draconic years?

  1. 365.2638

  2. 365.2422

  3. 365.25

  4. 365.24219
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The length of one Julian year is 365.2638 draconic years.

Multiple choice

What is the length of one Julian year in anomalistic years?

  1. 365.269

  2. 365.2422

  3. 365.25

  4. 365.24219
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The length of one Julian year is 365.269 anomalistic years.

Multiple choice

Which of the following is the longer year, the Julian year or the sidereal year?

  1. The Julian year

  2. The sidereal year

  3. They are the same length
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Julian year is longer than the sidereal year by approximately 20 minutes.

Multiple choice

How does a Golayantra measure the altitude of a celestial body?

  1. By measuring the angle between the celestial body and the horizon

  2. By measuring the angle between the celestial body and the zenith

  3. By measuring the angle between the celestial body and the celestial equator

  4. By measuring the angle between the celestial body and the ecliptic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A Golayantra measures the altitude of a celestial body by measuring the angle between the celestial body and the horizon.

Multiple choice

What is the term used to describe the point on a map where a celestial body is directly below the horizon?

  1. Ascendant

  2. Midheaven

  3. Nadir

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

The Nadir, also known as the IC, is the point on a map directly below the horizon, representing the lowest point in the sky and often associated with family, roots, and inner emotions.