Geodesy - Advanced topics in Geophysics - Geology & Geophysics Previous Year Questions

1

2010 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2010

The angle between the present geographic north and geomagnetic north is

A

1.5°

B

7.5°

C

11.5°

D

23.5°

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2

2011 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2011

The increase in the length of a day on the earth at a rate of 2.4 milliseconds/100 years is due to

A

prolate tidal bulge

B

tidal friction

C

spring tide

D

bodily earth tide

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3

2012 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2012

The distance between the centre of the Earth and the barycentre (i.e. centre of mass of the Earth-Moon system) is (in km)

A

4510

B

4670

C

4810

D

4860

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4

2024 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2024 [Session 2]

Assume the acceleration due to gravity is 10 m/s². The geoid height anomaly in metres due to the gravitational potential anomaly of –59 m²/s² measured over the spheroid is

A

–5.9

B

5.9

C

59

D

–59

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5

2024 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2024 [Session 2]

Assuming that the polar flattening of the Earth \(f = 3.353 \times 10^{-3}\), the difference between the geodetic and geocentric latitudes is maximum at

A

the poles

B

60° geocentric latitude

C

45° geocentric latitude

D

30° geocentric latitude

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6

2025 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2025 [Session 2]

If a planet is made of uniform density material and has no topography, then which one of the following statements is correct?

A

The geoid surface would be higher than the reference ellipsoid surface

B

The geoid surface would be lower than the reference ellipsoid surface

C

The geoid and the reference ellipsoid surfaces would coincide

D

The geoid surface would be lower in some places, and higher in other places, with respect to the reference ellipsoid

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7

2025 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2025 [Session 2]

The following figure shows the GPS data at two stations located near each other at the same latitude. Station A is moving towards the west while station B is moving towards the east. Which one of the following options is correct?

A

A and B are located on two sides of a convergent boundary

B

A and B are located on two sides of a transform boundary

C

A and B are located on two sides of a divergent boundary

D

A and B are parts of the same plate

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8

2017 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2017

The normal gravity formula (for e.g. GRS80) is a function of

A

geocentric latitude.

B

geodetic latitude.

C

longitude.

D

altitude.

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9

2017 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2017

The ratio of eccentricity to the polar flattening of an ellipsoidal Earth with equatorial radius 'e' and polar radius 'p' can be expressed as

A

\(\frac{\sqrt{e^2+p^2}}{\sqrt{e-p}}\)

B

\(\frac{\sqrt{e^2-p^2}}{\sqrt{e+p}}\)

C

\(\frac{\sqrt{e+p}}{\sqrt{e-p}}\)

D

\(\frac{\sqrt{e^2+p^2}}{\sqrt{e+p}}\)

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10

2021 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology & Geophysics (GG) 2021

The radius (r) of the oblate spheroid at 45° latitude with ellipticity of polar flattening of 1/298.25 and equatorial radius of 6378140 m is _______ km. [round off to 2 decimal places]

Check answer

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11

2026 · Geology & Geophysics · Advanced topics in Geophysics · Geodesy

Geology and Geophysics - Geology (GG) 2026

If \(r_1\) and \(r_2\), respectively, denote the equatorial and polar radii of a reference ellipsoid, then the radius, \(R\), of its equivalent sphere is given by

A

\((r_1 r_2^2)^{2/3}\)

B

\(r_1 r_2^2\)

C

\((r_1^2 r_2)^{1/3}\)

D

\(r_1^2 r_2\)

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