Geography · 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

How far away is Earth from the sun?

  1. 93 million miles

  2. 215 million miles

  3. 3.1 billion miles

  4. 5.2 billion miles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The average distance from the Earth to the sun is approximately 93 million miles, a distance often referred to as one astronomical unit.

Multiple choice

What shape is the Earth's orbit?

  1. Elliptical

  2. Triangle

  3. Circle

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

The Earth's orbit around the sun is not a perfect circle but an ellipse, which is an elongated or flattened circle.

Multiple choice geography how seasons occur - part i how seasons occur rotation and calculation of time seasons and time

The earth while orbiting makes various angles with the sun's rays. On 22nd December, the rays are vertical on earth at _______.

  1. $23 {\frac {1}{2}}^o$
  2. $30^o$ North
  3. $23 {\frac {1}{2}}^o$ South
  4. $30^o$ South
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Sun rays falling vertically move between 23 and 1/2 degrees north and 23 and 1/2 degrees south latitudes throughout the year. On 22nd december, the sun rays fall vertically at the 23 1/2 degrees south.
Multiple choice geography how seasons occur - part i how seasons occur rotation and calculation of time seasons and time

The inclination of the earth's axis to plane of the orbit is ______________.

  1. $90^o$
  2. $23{\frac {1}{2}}^o$
  3. $0^o$
  4. $66{\frac {1}{2}}^o$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The axis of the Earth is tilted at an angle of 23 1/2° from a perpendicular to the orbital plane.  This tilting of the axis is called the inclination of the Earth's axis. Due to this inclination, the axis of the Earth makes an angle of 66 1/2° with the plane of the Earth's orbit.

Multiple choice geography how seasons occur - part i how seasons occur rotation and calculation of time seasons and time

The speed of earth's rotation at the equator is ______________ km per hour.

  1. 16650

  2. 1562

  3. 1670

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Speed of the Earth's Rotation at the Equator:
  • Circumference of the Earth at the Equator = 40,000 kilometers
  • Time to complete one Rotation = 24 hours
  • Speed of Rotation = Distance/Time = 40,000 km / 24 hr = 1670 km/hr.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

What fraction of the surface area of earth can be covered to establish communication by one geostationary satellite?

  1. $\displaystyle\frac{1}{2}$
  2. $\displaystyle\frac{1}{3}$
  3. $\displaystyle\frac{1}{4}$
  4. $\displaystyle\frac{1}{8}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We uses three geostationary satellites placed at the vertices of an equilateral triangle, then the entire earth can be covered by the communication network, each satellite covers $1/3$ of the globe.

Multiple choice

How far does the average person walk in a lifetime?

  1. once around the Earth

  2. the distance of the solar system

  3. 5 times around the Earth

  4. the circumference of the sun
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The average person walks about 100,000 miles in a lifetime, which is roughly equivalent to walking around the Earth's equator five times.

Multiple choice geography tides and ocean currents circulation of ocean water movements of ocean and sea water oceans : temperature, salinity and density oceanic circulations study of water pollution threats to water resource pollution and environment

How much area of the Earth surface is covered by Hydrosphere?

  1. 71%

  2. 75%

  3. 66%

  4. 70%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Approximately 71% of the Earth's surface is covered by water, which constitutes the hydrosphere.

Multiple choice geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

The sub-polar high pressure belts lies around poles between 80 90 N and S latitudes.

  1. True

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

True,

Pressure Belts of Earth. On the earth's surface, there are seven pressure belts. They are the Equatorial Low, the two Subtropical highs, the two Subpolar lows, and the two Polar highs. Except the Equatorial low.

Multiple choice geography in search of the source of wind global pressure belts pressure belts atmospheric conditions

Subtropical high pressure belt lies close to the _______________.

  1. Equator

  2. Tropic of Cancer and Tropic of Capricorn

  3. North pole

  4. South pole
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Tropic of Cancer and Tropic of Capricorn
As it moves towards the mid-latitudes on both sides of the equator, the air cools and sinks. The resulting air mass subsidence creates a subtropical ridge of high pressure near the 30th parallel in both hemispheres.
The Tropic of Cancer is currently positioned at approximately 23.4 degrees north of the Equator. The Tropic of Capricorn is 23.4 degrees south of the Equator. The area between the Tropic of Cancer and the Tropic of Capricorn is often called the Tropics.
Multiple choice physics motion and measurement measuring length measurement of small and large distances measurement of distance

'The parallax angle in radians is: $\theta = \left( 1 + \frac { 54 } { 60 } \right) \times \frac { \pi } { 180 } = 0.03316 \mathrm { rad }$
  Hence, the distance between moon and earth: 

  1. $\dfrac { \text { Diameter of Earth } } { \theta }$
  2. $\dfrac { 1.276 \times 10 ^ { 7 } m } { 0.03316 }$
  3. $3.84 \times 10 ^ { 8 } m$

  4. nnone of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given,

$\theta =0.03316\,\,rad$

Also $b = \mathrm { AB } =$ diameter of earth $= 1.276 \times 10 ^ { 7 } \mathrm { m }$

Now d $=\dfrac{b}{\theta }=\dfrac{1.276\times {{10}^{7}}}{0.03316\,}=3.84\times {{10}^{8}}\text{m}$

Hence, distance between earth and moon is $3.84\times {{10}^{8}}\text{m}$