Geography ยท Physics

Geodesy and Celestial Mechanics

984 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

How much of the Earth's 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

Permafrost covers about 20% of the Earth's surface. It is found in regions with a cold climate, such as the Arctic and Antarctic.

Multiple choice

What is the approximate length of a tropical year?

  1. 365.242 days

  2. 366 days

  3. 365 days

  4. 364 days
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A tropical year is approximately 365.242 days long.

Multiple choice

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

Multiple choice

What is the rate of precession of the equinoxes?

  1. 50.3 arcseconds per year

  2. 50.2 arcseconds per year

  3. 50.1 arcseconds per year

  4. 50.0 arcseconds per year
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rate of precession of the equinoxes is approximately 50.3 arcseconds per year.

Multiple choice

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

  1. 25%

  2. 20%

  3. 15%

  4. 10%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Approximately 25% of the Earth's land surface is covered by permafrost.

Multiple choice

What is the average distance between the Earth and the Moon?

  1. 238,855 miles

  2. 384,400 miles

  3. 252,088 miles

  4. 405,504 miles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The average distance between the Earth and the Moon is approximately 238,855 miles (384,400 kilometers).

Multiple choice

What is the term used to describe the distance between a comet's perihelion and aphelion?

  1. Perihelion

  2. Aphelion

  3. Semi-major axis

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

Semi-major axis is the term used to describe the distance between a comet's perihelion and aphelion.

Multiple choice

What is the maximum allowable error in the positional accuracy of geographical data according to the Data Quality Standards for Geographical Data in India?

  1. 1 meter

  2. 2 meters

  3. 5 meters

  4. 10 meters
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The maximum allowable error in the positional accuracy of geographical data according to the Data Quality Standards for Geographical Data in India is 2 meters.

Multiple choice

What is the value of the Drake Equation?

  1. It is unknown

  2. It is 10

  3. It is 100

  4. It is 1000
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The value of the Drake Equation is unknown, as it depends on a number of factors that are difficult to estimate. However, some scientists have estimated that the value of the Drake Equation could be as high as 10,000,000.

Multiple choice

What are some of the most common geodetic datums?

  1. The World Geodetic System 1984 (WGS84)

  2. The North American Datum of 1983 (NAD83)

  3. The European Datum 1950 (ED50)

  4. The Tokyo Datum (TD)

  5. All of the above.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The World Geodetic System 1984 (WGS84), the North American Datum of 1983 (NAD83), the European Datum 1950 (ED50), and the Tokyo Datum (TD) are all common geodetic datums.

Multiple choice

What is the period of rotation of the Earth 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's period of rotation on its axis is approximately 24 hours, which is why we have a day and night cycle of 24 hours.

Multiple choice

What is the period of precession of the Earth's axis?

  1. 26,000 years

  2. 27,000 years

  3. 28,000 years

  4. 29,000 years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth's period of precession is approximately 26,000 years, which means that it takes 26,000 years for the Earth's axis to complete one full cycle.

Multiple choice

What is the approximate thickness of the Earth's atmosphere?

  1. 10 kilometers

  2. 100 kilometers

  3. 1,000 kilometers

  4. 10,000 kilometers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Earth's atmosphere extends approximately 100 kilometers above the Earth's surface.

Multiple choice

What is the approximate altitude of the tropopause?

  1. 10 kilometers

  2. 20 kilometers

  3. 30 kilometers

  4. 40 kilometers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The tropopause, which marks the boundary between the troposphere and stratosphere, is located at an altitude of approximately 10 kilometers.

Multiple choice

What is the approximate altitude of the mesopause?

  1. 50 kilometers

  2. 80 kilometers

  3. 100 kilometers

  4. 120 kilometers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mesopause, which marks the boundary between the mesosphere and thermosphere, is located at an altitude of approximately 80 kilometers.