GATE XE Ocean Sciences PYQs & Answers — Page 7

Questions 61–70 of 100. Imported answers require independent review unless marked reviewed.

Suppose, because of the doubling of atmospheric CO₂ concentration, an ocean water column receives an additional net energy input of 1 Wm⁻². If the entire water column of depth 1 km heats up uniformly, the water temperature will increase by 1 K in ____ years (round off to the nearest integer).

Assume all the additional heat added is retained and not lost. Take density of seawater = 1000 kg m⁻³; specific heat capacity of seawater = 4200 J kg⁻¹ K⁻¹.

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In the northern hemisphere, the flow in the middle depths of the ocean is geostrophic. As we go down from that level and start approaching the bottom of the ocean, the flow deflects to the left of the geostrophic current because

Your answerChoose one option.

friction increases and Coriolis force increases

friction decreases and Coriolis force decreases

friction increases and Coriolis force increases

friction increases and Coriolis force decreases

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Anthropogenic emission of ______ is the main contributor to the ongoing ocean acidification.

Your answerChoose one option.

Methane

Carbon dioxide

Nitrous oxide

Sulphuric acid

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What are phytoplankton?

Your answerChoose one option.

Microscopic animal life floating on surface of water bodies

Pollen floating freely on surface of water bodies

Microscopic plant life floating on surface of water bodies

Microscopic plant life living on the floor of water bodies

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Given that the angular velocity of rotation of the Earth = 7.3 × 10⁻⁵ s⁻¹, the period of inertial oscillations generated in the ocean by surface winds at 30° N latitude (rounded off to the nearest integer) is ______ hours.

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Which one of the following statements is true for atmospheric and oceanic general circulation models?

Your answerChoose one option.

Vertical velocity is ignored in oceanic models but not in atmospheric models.

Boussinesq approximation is adequate in oceanic models but not in atmospheric models.

Atmospheric models need a longer spin-up and integration time than oceanic models.

Atmospheric models need parameterizations for subgrid scale processes but ocean models do not.

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The prevailing Trade winds over the Equator in the Pacific Ocean result in piling up of waters in the ______ part of the ocean. As a result, the gradients of the thermocline and the ocean surface have ______ signs. The correct pair of words to fill in the blanks (in the right order) is

Your answerChoose one option.

western, opposite

western, same

eastern, opposite

eastern, same

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Consider two different cases, shown in Figures (i) and (ii) below, with two layers of water of same density on top of each other.

Figure	Upper layer	Lower layer
(i)	Warm and salty	Cold and fresh
(ii)	Cold and fresh	Warm and salty

Which one of the following statements is true about convective plumes across the interface of the two layers?

Your answerChoose one option.

Upward convective plumes in (i) and downward convective plumes in (ii)

Downward convective plumes in (i) and upward convective plumes in (ii)

No convective plume in (i) and (ii)

No convective plume in (i) but upward convective plumes in (ii)

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A tsunami wave in the ocean is approaching the coast. Assuming g = 10 m s⁻², the correct group speed of the wave at a depth of 1 km is

Your answerChoose one option.

1 m s⁻¹

10 m s⁻¹

100 m s⁻¹

1000 m s⁻¹

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A westerly wind of 10 m s⁻¹ is blowing at a location in the Pacific Ocean in the northern hemisphere. Assuming density of sea water = 1000 kg m⁻³, Coriolis parameter = 10⁻⁴ s⁻¹ and drag coefficient for sea water = 10⁻⁶, the Ekman transport due to the wind at that location is ______ kg m⁻¹ s⁻¹.

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GATE XE Ocean Sciences PYQs

Question 20

Question 1

Question 3

Question 4

Question 9

Question 11

Question 13

Question 14

Question 16

Question 19