GATE XE Ocean Sciences PYQs & Answers — Page 5

Questions 41–50 of 100. Imported answers require independent review unless marked reviewed.

From the following list identify the region that has low chlorophyll and low nutrients.

Your answerChoose one option.

Upwelling, anticyclonic eddy

Upwelling, cyclonic eddy

Downwelling, anticyclonic eddy

Downwelling, cyclonic eddy

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Match the following physical phenomena from the perspective of monsoonal circulation:

Column-1	Column-2
a) Reversal of East-West temperature gradient with seasons	i) Over the tropics
b) Reversal of North-South temperature gradient with seasons	ii) Indian Ocean
c) Surface cooling and deepening of mixed layer	iii) Over mid-latitudes
d) Northward movement of south equatorial current	iv) Arabian Sea

Your answerChoose one option.

a-i, b-iii, c-ii, d-iv

a-ii, b-i, c-iv, d-ii

a-ii, b-ii, c-iv, d-i

a-ii, b-i, c-ii, d-iv

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Choose the correct statement(s) in context to Ekman spiral from the following:

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

The balance of Coriolis force and pressure

The balance of Coriolis force, wind shear, and frictional force

Deflection of surface current to the right of the wind direction in the Northern hemisphere

The increase of current velocity with depth

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A cylindrical tank containing water is rotating about the z-axis at a constant angular velocity of 10 rad s

. The schematic of the isobaric surface is shown in the following illustration, where ‘A’ and ‘B’ are two points on the isobaric surface at heights ‘z

’ and ‘z

’, respectively. Assuming the atmospheric pressure to be negligible and no transient flow, estimate the elevation difference in m between ‘z

’ and ‘z

’.

(consider r

= 0.5 m, r

= 1.0 m and gravitational acceleration g = 9.8 m s

, rounded off to two decimal places)

Diagram for Engineering Sciences question 172

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Considering a gyre system in the following illustration (where ‘L’ and ‘H’ represent low- and high-pressure regions along 45° N), the average slope between the points ‘A’ and ‘B’ is 2.1 cm km

under no wind condition. For a steady southerly wind of 10 m s

over these regions, find out the magnitude of the current velocity in m s

(rounded off to two decimal places).

Diagram for Engineering Sciences question 175

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Which one of the following statements regarding equatorial under current (EUC) in the Pacific Ocean is correct?

Your answerChoose one option.

EUC flows from west to east.

EUC flows from east to west.

EUC flows from north to south.

EUC flows from south to north.

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A fluid is in solid body rotation in a cylindrical container of radius

rotating with an angular velocity

. The circulation per unit area around a circular loop in the horizontal plane of radius

(

), whose center coincides with the axis of rotation is

Your answerChoose one option.

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Consider an atmosphere where the mole fractions of N₂, Ar and CO₂ are 7.81×10⁻¹, 9.34×10⁻³ and 4.05×10⁻⁴, respectively. This atmosphere exchanges gases with sea water below having temperature and salinity of 20 °C and 35 psu, respectively. In the absence of biological and chemical activity, relative concentrations of dissolved gases in the surface sea water at equilibrium are ordered as

Your answerChoose one option.

[N₂] > [Ar] > [CO₂]

[CO₂] > [N₂] > [Ar]

[N₂] > [CO₂] > [Ar]

[Ar] > [CO₂] > [N₂]

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Gravitational forces exerted by the Sun and the Moon are mainly responsible for ocean tides. Which of the following statement(s) regarding ocean tides is/are correct?

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

Tidal amplitude corresponding to diurnal period is larger than that of the semi-diurnal period.

Diurnal time period of lunar forced tides is longer than that of the solar forced tides.

Tidal amplitudes are larger during a solar eclipse compared to that during a lunar eclipse.

Tides are absent during equinoxes.

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Which of the following statement(s) is/are true regarding biogeochemical cycle in the ocean?

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

Shutdown of the biological pump in the ocean would have resulted in higher CO₂ concentration in the atmosphere compared to present-day.

If atmospheric CO₂ concentration increases, solubility pump would lead to a decrease in dissolved inorganic carbon in the ocean.

All carbon sequestered by marine photosynthesis settles down on the ocean floor as organic matter.

Calcification (the process of making shells and skeletons) by marine organisms in the surface ocean layer would lead to an increase in the surface ocean CO₂.

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GATE XE Ocean Sciences PYQs

Question 164

Question 165

Question 166

Question 172

Question 175

Question 157

Question 164

Question 166

Question 167

Question 170