GATE GG-1 year:2025 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

Three pixels P, Q, and R in an image are characterized by the NDVI values of + 0.84, + 0.01, and − 0.89, respectively. Which of the following options is/are correct?

Your answerSelect all correct options. You can choose more than one.

P is from vegetation area and Q is from barren land

Q is from water body and R is from barren land

Q is from barren land and R is from water body

P is from vegetation area and Q is from water body

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Which of the following can indicate the presence of significant sub-surface iron mineralization?

Your answerSelect all correct options. You can choose more than one.

Free air gravity anomaly

Bouguer gravity anomaly

Magnetic anomaly

Electrical resistivity measurements

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Which of the following statements is/are correct regarding the magnetic field lines of the Earth, at the magnetic poles and the magnetic equator?

Your answerSelect all correct options. You can choose more than one.

Horizontal at the equator

Vertical at the poles

Horizontal at the poles

Vertical at the equator

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If the lowest Digital Number (DN) value in an image of 10-bit radiometric resolution is 0, then the maximum DN value of that image is __________

(Answer in integer)

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If one liter of water at pH 7 is mixed with one liter of water at pH 6, the resulting pH of the mixture is __________

(Round off to two decimal places)

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A hillslope is shown below. If the area over the failure plane is 50 m

and the weight of the hillslope material (W) is 2000 tons, the Factor of Safety (FS) for this hillslope in dry conditions is ____________

(Cohesion along failure plane = 196 KPa, dip of failure plane = 60°, and internal friction angle = 30°).

(Round off to two decimal places)

Diagram for Geology and Geophysics question 26

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Which one of the following statements explains why elements Li, Be, and B have low cosmic abundance?

Your answerChoose one option.

These elements have low masses and hence, they break apart easily

These elements have low binding energies which makes them unstable at high temperatures at the core of stars

The low abundance of these elements is a unique feature of big stars with mass greater than 10 times that of our Sun

These elements are highly reactive and hence, unstable

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During a geochemical exploration survey in a hilly terrain, Cu concentration of stream sediments from a third order basin outlet was measured to be 3000 ppm. Considering a catchment area of 10 km

and a Cu background value of 200 ppm, which one of the following options is the productivity of this catchment for Cu?

Your answerChoose one option.

1.5 × 10

2.8 × 10

3.0 × 10

3.2 × 10

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The combinations listed below represent major minerals observed in four igneous rocks:

(i) Olivine and Anorthite, (ii) K-feldspar and Quartz, (iii) Mg-Ca-pyroxene and Ca-Na-plagioclase, (iv) Amphibole and Na-Ca-plagioclase

Arrange these mineral combinations based on decreasing temperature of magma crystallization.

Your answerChoose one option.

(i) > (ii) > (iii) > (iv)

(i) > (iii) > (iv) > (ii)

(i) > (iv) > (iii) > (ii)

(ii) > (i) > (iv) > (iii)

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Shown below is a schematic plot of

(deviation of

in a sample relative to CHUR) versus time. The two solid lines represent the evolution curves for the depleted mantle reservoir and the continental crust. Which one of the four dashed lines, marked 1, 2, 3, and 4, represents the evolution of the CHUR?

Diagram for Geology and Geophysics question 30

Your answerChoose one option.

Line 1

Line 2

Line 3

Line 4

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GATE GG-1 year:2025 PYQs

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30